docs: D-2 — rolling back the image does not roll back the schema

Downgrading from 26.7.0 to 26.0 fails with liquibase ValidationFailedException on a changeset checksum, which is stricter than an unknown migration: the old version knows the changeset but its definition differs. The pod goes CrashLoopBackOff and never starts. The StatefulSet stopped the rollout at the first pod, so the other kept serving and the front door stayed at 200, which replica 1 would not have done. The failed start never touched the schema, so restoring the image was enough; had the migration already applied, the D-1 database restore would have been the only way back. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
docs: D-1 — an empty database still answered 200
2026-09-04 15:05:36 +09:00 · 2026-09-04 14:59:56 +09:00 · 2026-09-04 14:56:58 +09:00 · 2026-09-04 14:49:36 +09:00 · 2026-09-04 14:44:00 +09:00 · 2026-09-04 14:33:42 +09:00
156 changed files with 6233 additions and 0 deletions
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+[     635ms] [WARNING] <meta name="apple-mobile-web-app-capable" content="yes"> is deprecated. Please include <meta name="mobile-web-app-capable" content="yes"> @ https://app2.hyeonworks.com/explore?schemaVersion=1&orgId=1&panes=%7B%22a%22%3A%7B%22datasource%22%3A%22PBFA97CFB590B2093%22%2C%22queries%22%3A%5B%7B%22refId%22%3A%22A%22%2C%22expr%22%3A%22vendor_statistics_approximate_entries_unique%7Bcache%3D%5C%22sessions%5C%22%7D%22%2C%22range%22%3Atrue%2C%22instant%22%3Afalse%2C%22editorMode%22%3A%22code%22%2C%22legendFormat%22%3A%22%7B%7Bpod%7D%7D%22%2C%22datasource%22%3A%7B%22type%22%3A%22prometheus%22%2C%22uid%22%3A%22PBFA97CFB590B2093%22%7D%7D%2C%7B%22refId%22%3A%22B%22%2C%22expr%22%3A%22vendor_cluster_size%22%2C%22range%22%3Atrue%2C%22instant%22%3Afalse%2C%22editorMode%22%3A%22code%22%2C%22legendFormat%22%3A%22cluster_size%20%7B%7Bpod%7D%7D%22%2C%22datasource%22%3A%7B%22type%22%3A%22prometheus%22%2C%22uid%22%3A%22PBFA97CFB590B2093%22%7D%7D%5D%2C%22range%22%3A%7B%22from%22%3A%22now-15m%22%2C%22to%22%3A%22now%22%7D%7D%7D:0
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+[  669816ms] [ERROR] WebSocket connection to 'wss://app2.hyeonworks.com/api/live/ws' failed: Error during WebSocket handshake: Unexpected response code: 400 @ https://app2.hyeonworks.com/public/build/1518.a3f1f690c084a37f01c7.js:362
+[  675422ms] [ERROR] WebSocket connection to 'wss://app2.hyeonworks.com/api/live/ws' failed: Error during WebSocket handshake: Unexpected response code: 400 @ https://app2.hyeonworks.com/public/build/1518.a3f1f690c084a37f01c7.js:362
+[  677001ms] [ERROR] WebSocket connection to 'wss://app2.hyeonworks.com/api/live/ws' failed: Error during WebSocket handshake: Unexpected response code: 400 @ https://app2.hyeonworks.com/public/build/1518.a3f1f690c084a37f01c7.js:362
+[  686611ms] [ERROR] WebSocket connection to 'wss://app2.hyeonworks.com/api/live/ws' failed: Error during WebSocket handshake: Unexpected response code: 400 @ https://app2.hyeonworks.com/public/build/1518.a3f1f690c084a37f01c7.js:362
+[  692655ms] [ERROR] WebSocket connection to 'wss://app2.hyeonworks.com/api/live/ws' failed: Error during WebSocket handshake: Unexpected response code: 400 @ https://app2.hyeonworks.com/public/build/1518.a3f1f690c084a37f01c7.js:362
+[  713114ms] [ERROR] WebSocket connection to 'wss://app2.hyeonworks.com/api/live/ws' failed: Error during WebSocket handshake: Unexpected response code: 400 @ https://app2.hyeonworks.com/public/build/1518.a3f1f690c084a37f01c7.js:362
+[  723787ms] [ERROR] WebSocket connection to 'wss://app2.hyeonworks.com/api/live/ws' failed: Error during WebSocket handshake: Unexpected response code: 400 @ https://app2.hyeonworks.com/public/build/1518.a3f1f690c084a37f01c7.js:362
+[  730443ms] [ERROR] WebSocket connection to 'wss://app2.hyeonworks.com/api/live/ws' failed: Error during WebSocket handshake: Unexpected response code: 400 @ https://app2.hyeonworks.com/public/build/1518.a3f1f690c084a37f01c7.js:362
+[  751427ms] [ERROR] WebSocket connection to 'wss://app2.hyeonworks.com/api/live/ws' failed: Error during WebSocket handshake: Unexpected response code: 400 @ https://app2.hyeonworks.com/public/build/1518.a3f1f690c084a37f01c7.js:362
+[  757583ms] [ERROR] WebSocket connection to 'wss://app2.hyeonworks.com/api/live/ws' failed: Error during WebSocket handshake: Unexpected response code: 400 @ https://app2.hyeonworks.com/public/build/1518.a3f1f690c084a37f01c7.js:362
+[  776007ms] [ERROR] WebSocket connection to 'wss://app2.hyeonworks.com/api/live/ws' failed: Error during WebSocket handshake: Unexpected response code: 400 @ https://app2.hyeonworks.com/public/build/1518.a3f1f690c084a37f01c7.js:362
+[  792298ms] [ERROR] WebSocket connection to 'wss://app2.hyeonworks.com/api/live/ws' failed: Error during WebSocket handshake: Unexpected response code: 400 @ https://app2.hyeonworks.com/public/build/1518.a3f1f690c084a37f01c7.js:362
+[  803509ms] [ERROR] WebSocket connection to 'wss://app2.hyeonworks.com/api/live/ws' failed: Error during WebSocket handshake: Unexpected response code: 400 @ https://app2.hyeonworks.com/public/build/1518.a3f1f690c084a37f01c7.js:362
+[  822917ms] [ERROR] WebSocket connection to 'wss://app2.hyeonworks.com/api/live/ws' failed: Error during WebSocket handshake: Unexpected response code: 400 @ https://app2.hyeonworks.com/public/build/1518.a3f1f690c084a37f01c7.js:362
+[  827374ms] [ERROR] WebSocket connection to 'wss://app2.hyeonworks.com/api/live/ws' failed: Error during WebSocket handshake: Unexpected response code: 400 @ https://app2.hyeonworks.com/public/build/1518.a3f1f690c084a37f01c7.js:362
+[  847278ms] [ERROR] WebSocket connection to 'wss://app2.hyeonworks.com/api/live/ws' failed: Error during WebSocket handshake: Unexpected response code: 400 @ https://app2.hyeonworks.com/public/build/1518.a3f1f690c084a37f01c7.js:362
+[  867460ms] [ERROR] WebSocket connection to 'wss://app2.hyeonworks.com/api/live/ws' failed: Error during WebSocket handshake: Unexpected response code: 400 @ https://app2.hyeonworks.com/public/build/1518.a3f1f690c084a37f01c7.js:362
+[  875338ms] [ERROR] WebSocket connection to 'wss://app2.hyeonworks.com/api/live/ws' failed: Error during WebSocket handshake: Unexpected response code: 400 @ https://app2.hyeonworks.com/public/build/1518.a3f1f690c084a37f01c7.js:362
+[  886296ms] [ERROR] WebSocket connection to 'wss://app2.hyeonworks.com/api/live/ws' failed: Error during WebSocket handshake: Unexpected response code: 400 @ https://app2.hyeonworks.com/public/build/1518.a3f1f690c084a37f01c7.js:362
+[  900938ms] [ERROR] WebSocket connection to 'wss://app2.hyeonworks.com/api/live/ws' failed: Error during WebSocket handshake: Unexpected response code: 400 @ https://app2.hyeonworks.com/public/build/1518.a3f1f690c084a37f01c7.js:362
+[  912511ms] [ERROR] WebSocket connection to 'wss://app2.hyeonworks.com/api/live/ws' failed: Error during WebSocket handshake: Unexpected response code: 400 @ https://app2.hyeonworks.com/public/build/1518.a3f1f690c084a37f01c7.js:362
+[  917067ms] [ERROR] WebSocket connection to 'wss://app2.hyeonworks.com/api/live/ws' failed: Error during WebSocket handshake: Unexpected response code: 400 @ https://app2.hyeonworks.com/public/build/1518.a3f1f690c084a37f01c7.js:362
+[  924405ms] [ERROR] WebSocket connection to 'wss://app2.hyeonworks.com/api/live/ws' failed: Error during WebSocket handshake: Unexpected response code: 400 @ https://app2.hyeonworks.com/public/build/1518.a3f1f690c084a37f01c7.js:362
+[  930435ms] [ERROR] WebSocket connection to 'wss://app2.hyeonworks.com/api/live/ws' failed: Error during WebSocket handshake: Unexpected response code: 400 @ https://app2.hyeonworks.com/public/build/1518.a3f1f690c084a37f01c7.js:362
+[  942211ms] [ERROR] WebSocket connection to 'wss://app2.hyeonworks.com/api/live/ws' failed: Error during WebSocket handshake: Unexpected response code: 400 @ https://app2.hyeonworks.com/public/build/1518.a3f1f690c084a37f01c7.js:362
+[  953146ms] [ERROR] WebSocket connection to 'wss://app2.hyeonworks.com/api/live/ws' failed: Error during WebSocket handshake: Unexpected response code: 400 @ https://app2.hyeonworks.com/public/build/1518.a3f1f690c084a37f01c7.js:362
+[  957153ms] [ERROR] WebSocket connection to 'wss://app2.hyeonworks.com/api/live/ws' failed: Error during WebSocket handshake: Unexpected response code: 400 @ https://app2.hyeonworks.com/public/build/1518.a3f1f690c084a37f01c7.js:362
+[  969140ms] [ERROR] WebSocket connection to 'wss://app2.hyeonworks.com/api/live/ws' failed: Error during WebSocket handshake: Unexpected response code: 400 @ https://app2.hyeonworks.com/public/build/1518.a3f1f690c084a37f01c7.js:362
+[  984088ms] [ERROR] WebSocket connection to 'wss://app2.hyeonworks.com/api/live/ws' failed: Error during WebSocket handshake: Unexpected response code: 400 @ https://app2.hyeonworks.com/public/build/1518.a3f1f690c084a37f01c7.js:362
+[ 1003544ms] [ERROR] WebSocket connection to 'wss://app2.hyeonworks.com/api/live/ws' failed: Error during WebSocket handshake: Unexpected response code: 400 @ https://app2.hyeonworks.com/public/build/1518.a3f1f690c084a37f01c7.js:362
+[ 1014908ms] [ERROR] WebSocket connection to 'wss://app2.hyeonworks.com/api/live/ws' failed: Error during WebSocket handshake: Unexpected response code: 400 @ https://app2.hyeonworks.com/public/build/1518.a3f1f690c084a37f01c7.js:362
+[ 1020851ms] [ERROR] WebSocket connection to 'wss://app2.hyeonworks.com/api/live/ws' failed: Error during WebSocket handshake: Unexpected response code: 400 @ https://app2.hyeonworks.com/public/build/1518.a3f1f690c084a37f01c7.js:362
+[ 1034668ms] [ERROR] WebSocket connection to 'wss://app2.hyeonworks.com/api/live/ws' failed: Error during WebSocket handshake: Unexpected response code: 400 @ https://app2.hyeonworks.com/public/build/1518.a3f1f690c084a37f01c7.js:362
+[ 1040406ms] [ERROR] WebSocket connection to 'wss://app2.hyeonworks.com/api/live/ws' failed: Error during WebSocket handshake: Unexpected response code: 400 @ https://app2.hyeonworks.com/public/build/1518.a3f1f690c084a37f01c7.js:362
+[ 1056887ms] [ERROR] WebSocket connection to 'wss://app2.hyeonworks.com/api/live/ws' failed: Error during WebSocket handshake: Unexpected response code: 400 @ https://app2.hyeonworks.com/public/build/1518.a3f1f690c084a37f01c7.js:362
+[ 1062828ms] [ERROR] WebSocket connection to 'wss://app2.hyeonworks.com/api/live/ws' failed: Error during WebSocket handshake: Unexpected response code: 400 @ https://app2.hyeonworks.com/public/build/1518.a3f1f690c084a37f01c7.js:362
+[ 1073375ms] [ERROR] WebSocket connection to 'wss://app2.hyeonworks.com/api/live/ws' failed: Error during WebSocket handshake: Unexpected response code: 400 @ https://app2.hyeonworks.com/public/build/1518.a3f1f690c084a37f01c7.js:362
+[ 1085052ms] [ERROR] WebSocket connection to 'wss://app2.hyeonworks.com/api/live/ws' failed: Error during WebSocket handshake: Unexpected response code: 400 @ https://app2.hyeonworks.com/public/build/1518.a3f1f690c084a37f01c7.js:362
+[ 1102031ms] [ERROR] WebSocket connection to 'wss://app2.hyeonworks.com/api/live/ws' failed: Error during WebSocket handshake: Unexpected response code: 400 @ https://app2.hyeonworks.com/public/build/1518.a3f1f690c084a37f01c7.js:362
+[ 1110039ms] [ERROR] WebSocket connection to 'wss://app2.hyeonworks.com/api/live/ws' failed: Error during WebSocket handshake: Unexpected response code: 400 @ https://app2.hyeonworks.com/public/build/1518.a3f1f690c084a37f01c7.js:362
+[ 1129341ms] [ERROR] WebSocket connection to 'wss://app2.hyeonworks.com/api/live/ws' failed: Error during WebSocket handshake: Unexpected response code: 400 @ https://app2.hyeonworks.com/public/build/1518.a3f1f690c084a37f01c7.js:362
+[ 1132300ms] [ERROR] WebSocket connection to 'wss://app2.hyeonworks.com/api/live/ws' failed: Error during WebSocket handshake: Unexpected response code: 400 @ https://app2.hyeonworks.com/public/build/1518.a3f1f690c084a37f01c7.js:362
+[ 1133670ms] [ERROR] WebSocket connection to 'wss://app2.hyeonworks.com/api/live/ws' failed: Error during WebSocket handshake: Unexpected response code: 400 @ https://app2.hyeonworks.com/public/build/1518.a3f1f690c084a37f01c7.js:362
+[ 1142705ms] [ERROR] WebSocket connection to 'wss://app2.hyeonworks.com/api/live/ws' failed: Error during WebSocket handshake: Unexpected response code: 400 @ https://app2.hyeonworks.com/public/build/1518.a3f1f690c084a37f01c7.js:362
+[ 1160906ms] [ERROR] WebSocket connection to 'wss://app2.hyeonworks.com/api/live/ws' failed: Error during WebSocket handshake: Unexpected response code: 400 @ https://app2.hyeonworks.com/public/build/1518.a3f1f690c084a37f01c7.js:362
+[ 1172400ms] [ERROR] WebSocket connection to 'wss://app2.hyeonworks.com/api/live/ws' failed: Error during WebSocket handshake: Unexpected response code: 400 @ https://app2.hyeonworks.com/public/build/1518.a3f1f690c084a37f01c7.js:362
+[ 1190482ms] [ERROR] WebSocket connection to 'wss://app2.hyeonworks.com/api/live/ws' failed: Error during WebSocket handshake: Unexpected response code: 400 @ https://app2.hyeonworks.com/public/build/1518.a3f1f690c084a37f01c7.js:362
+[ 1196673ms] [ERROR] WebSocket connection to 'wss://app2.hyeonworks.com/api/live/ws' failed: Error during WebSocket handshake: Unexpected response code: 400 @ https://app2.hyeonworks.com/public/build/1518.a3f1f690c084a37f01c7.js:362
+[ 1213666ms] [ERROR] WebSocket connection to 'wss://app2.hyeonworks.com/api/live/ws' failed: Error during WebSocket handshake: Unexpected response code: 400 @ https://app2.hyeonworks.com/public/build/1518.a3f1f690c084a37f01c7.js:362
+[ 1225136ms] [ERROR] WebSocket connection to 'wss://app2.hyeonworks.com/api/live/ws' failed: Error during WebSocket handshake: Unexpected response code: 400 @ https://app2.hyeonworks.com/public/build/1518.a3f1f690c084a37f01c7.js:362
+[ 1228310ms] [ERROR] WebSocket connection to 'wss://app2.hyeonworks.com/api/live/ws' failed: Error during WebSocket handshake: Unexpected response code: 400 @ https://app2.hyeonworks.com/public/build/1518.a3f1f690c084a37f01c7.js:362
+[ 1242751ms] [ERROR] WebSocket connection to 'wss://app2.hyeonworks.com/api/live/ws' failed: Error during WebSocket handshake: Unexpected response code: 400 @ https://app2.hyeonworks.com/public/build/1518.a3f1f690c084a37f01c7.js:362
+[ 1243874ms] [ERROR] WebSocket connection to 'wss://app2.hyeonworks.com/api/live/ws' failed: Error during WebSocket handshake: Unexpected response code: 400 @ https://app2.hyeonworks.com/public/build/1518.a3f1f690c084a37f01c7.js:362
+[ 1256126ms] [ERROR] WebSocket connection to 'wss://app2.hyeonworks.com/api/live/ws' failed: Error during WebSocket handshake: Unexpected response code: 400 @ https://app2.hyeonworks.com/public/build/1518.a3f1f690c084a37f01c7.js:362
+[ 1274444ms] [ERROR] WebSocket connection to 'wss://app2.hyeonworks.com/api/live/ws' failed: Error during WebSocket handshake: Unexpected response code: 400 @ https://app2.hyeonworks.com/public/build/1518.a3f1f690c084a37f01c7.js:362
+[ 1288526ms] [ERROR] WebSocket connection to 'wss://app2.hyeonworks.com/api/live/ws' failed: Error during WebSocket handshake: Unexpected response code: 400 @ https://app2.hyeonworks.com/public/build/1518.a3f1f690c084a37f01c7.js:362
+[ 1307058ms] [ERROR] WebSocket connection to 'wss://app2.hyeonworks.com/api/live/ws' failed: Error during WebSocket handshake: Unexpected response code: 400 @ https://app2.hyeonworks.com/public/build/1518.a3f1f690c084a37f01c7.js:362
+[ 1320986ms] [ERROR] WebSocket connection to 'wss://app2.hyeonworks.com/api/live/ws' failed: Error during WebSocket handshake: Unexpected response code: 400 @ https://app2.hyeonworks.com/public/build/1518.a3f1f690c084a37f01c7.js:362
+[ 1325134ms] [ERROR] WebSocket connection to 'wss://app2.hyeonworks.com/api/live/ws' failed: Error during WebSocket handshake: Unexpected response code: 400 @ https://app2.hyeonworks.com/public/build/1518.a3f1f690c084a37f01c7.js:362
+[ 1335974ms] [ERROR] WebSocket connection to 'wss://app2.hyeonworks.com/api/live/ws' failed: Error during WebSocket handshake: Unexpected response code: 400 @ https://app2.hyeonworks.com/public/build/1518.a3f1f690c084a37f01c7.js:362
+[ 1344832ms] [ERROR] WebSocket connection to 'wss://app2.hyeonworks.com/api/live/ws' failed: Error during WebSocket handshake: Unexpected response code: 400 @ https://app2.hyeonworks.com/public/build/1518.a3f1f690c084a37f01c7.js:362
+[ 1354780ms] [ERROR] WebSocket connection to 'wss://app2.hyeonworks.com/api/live/ws' failed: Error during WebSocket handshake: Unexpected response code: 400 @ https://app2.hyeonworks.com/public/build/1518.a3f1f690c084a37f01c7.js:362
+[ 1364165ms] [ERROR] WebSocket connection to 'wss://app2.hyeonworks.com/api/live/ws' failed: Error during WebSocket handshake: Unexpected response code: 400 @ https://app2.hyeonworks.com/public/build/1518.a3f1f690c084a37f01c7.js:362
+[ 1383346ms] [ERROR] WebSocket connection to 'wss://app2.hyeonworks.com/api/live/ws' failed: Error during WebSocket handshake: Unexpected response code: 400 @ https://app2.hyeonworks.com/public/build/1518.a3f1f690c084a37f01c7.js:362
+[ 1399019ms] [ERROR] WebSocket connection to 'wss://app2.hyeonworks.com/api/live/ws' failed: Error during WebSocket handshake: Unexpected response code: 400 @ https://app2.hyeonworks.com/public/build/1518.a3f1f690c084a37f01c7.js:362
+[ 1400207ms] [ERROR] WebSocket connection to 'wss://app2.hyeonworks.com/api/live/ws' failed: Error during WebSocket handshake: Unexpected response code: 400 @ https://app2.hyeonworks.com/public/build/1518.a3f1f690c084a37f01c7.js:362
+[ 1413875ms] [ERROR] WebSocket connection to 'wss://app2.hyeonworks.com/api/live/ws' failed: Error during WebSocket handshake: Unexpected response code: 400 @ https://app2.hyeonworks.com/public/build/1518.a3f1f690c084a37f01c7.js:362
+[ 1423809ms] [ERROR] WebSocket connection to 'wss://app2.hyeonworks.com/api/live/ws' failed: Error during WebSocket handshake: Unexpected response code: 400 @ https://app2.hyeonworks.com/public/build/1518.a3f1f690c084a37f01c7.js:362
+[ 1427502ms] [ERROR] WebSocket connection to 'wss://app2.hyeonworks.com/api/live/ws' failed: Error during WebSocket handshake: Unexpected response code: 400 @ https://app2.hyeonworks.com/public/build/1518.a3f1f690c084a37f01c7.js:362
+[ 1430773ms] [ERROR] WebSocket connection to 'wss://app2.hyeonworks.com/api/live/ws' failed: Error during WebSocket handshake: Unexpected response code: 400 @ https://app2.hyeonworks.com/public/build/1518.a3f1f690c084a37f01c7.js:362
+[ 1436408ms] [ERROR] WebSocket connection to 'wss://app2.hyeonworks.com/api/live/ws' failed: Error during WebSocket handshake: Unexpected response code: 400 @ https://app2.hyeonworks.com/public/build/1518.a3f1f690c084a37f01c7.js:362
+[ 1447464ms] [ERROR] WebSocket connection to 'wss://app2.hyeonworks.com/api/live/ws' failed: Error during WebSocket handshake: Unexpected response code: 400 @ https://app2.hyeonworks.com/public/build/1518.a3f1f690c084a37f01c7.js:362
@@ -0,0 +1 @@
+[     207ms] [ERROR] Failed to load resource: the server responded with a status of 404 () @ https://app1.hyeonworks.com/favicon.ico:0
@@ -0,0 +1 @@
+[     236ms] [ERROR] Failed to load resource: the server responded with a status of 500 () @ https://app1.hyeonworks.com/bff/api/me:0
@@ -0,0 +1,2 @@
+[    7292ms] [ERROR] Access to fetch at 'https://auth.hyeonworks.com/realms/keycloak-patterns/protocol/openid-connect/auth?response_type=code&client_id=bff-confidential&scope=openid%20profile%20email&state=WWc76H7TY73Fbsdc41B2nRD5exkXqHcohLh4WdJB4AA%3D&redirect_uri=https://app1.hyeonworks.com/login/oauth2/code/keycloak&nonce=A4TXweuKS4Y5HdZ63rLJUez1ZOyI2em6zs3OIfTXLFo&code_challenge=wPr8PXG0lcUvie7Wo91YrVMhOUYq0KtEU4PxVJ0_CWA&code_challenge_method=S256' (redirected from 'https://app1.hyeonworks.com/bff/api/me') from origin 'https://app1.hyeonworks.com' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. @ https://app1.hyeonworks.com/bff/token-boundary:0
+[    7293ms] [ERROR] Failed to load resource: net::ERR_FAILED @ https://auth.hyeonworks.com/realms/keycloak-patterns/protocol/openid-connect/auth?response_type=code&client_id=bff-confidential&scope=openid%20profile%20email&state=WWc76H7TY73Fbsdc41B2nRD5exkXqHcohLh4WdJB4AA%3D&redirect_uri=https://app1.hyeonworks.com/login/oauth2/code/keycloak&nonce=A4TXweuKS4Y5HdZ63rLJUez1ZOyI2em6zs3OIfTXLFo&code_challenge=wPr8PXG0lcUvie7Wo91YrVMhOUYq0KtEU4PxVJ0_CWA&code_challenge_method=S256:0
@@ -0,0 +1,2 @@
+[    6726ms] [ERROR] Access to fetch at 'https://auth.hyeonworks.com/realms/keycloak-patterns/protocol/openid-connect/auth?response_type=code&client_id=bff-confidential&scope=openid%20profile%20email&state=GGupuPr3ZklKp8ah99r7h7mNHEq9yTsEWZr85WyXevE%3D&redirect_uri=https://app1.hyeonworks.com/login/oauth2/code/keycloak&nonce=rPVvEOvG7rzssAjR7pP67qNvoY2W6ZVpIpKYz1LGoU8&code_challenge=qoKRLRrzB7z9CU_rlaAxJ7UYcRZswyqmDi8PgxmaWM0&code_challenge_method=S256' (redirected from 'https://app1.hyeonworks.com/bff/api/me') from origin 'https://app1.hyeonworks.com' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. @ https://app1.hyeonworks.com/:0
+[    6726ms] [ERROR] Failed to load resource: net::ERR_FAILED @ https://auth.hyeonworks.com/realms/keycloak-patterns/protocol/openid-connect/auth?response_type=code&client_id=bff-confidential&scope=openid%20profile%20email&state=GGupuPr3ZklKp8ah99r7h7mNHEq9yTsEWZr85WyXevE%3D&redirect_uri=https://app1.hyeonworks.com/login/oauth2/code/keycloak&nonce=rPVvEOvG7rzssAjR7pP67qNvoY2W6ZVpIpKYz1LGoU8&code_challenge=qoKRLRrzB7z9CU_rlaAxJ7UYcRZswyqmDi8PgxmaWM0&code_challenge_method=S256:0
@@ -0,0 +1,2 @@
+[    6898ms] [ERROR] Failed to load resource: the server responded with a status of 403 () @ https://app1.hyeonworks.com/logout:0
+[   23950ms] [ERROR] Failed to load resource: the server responded with a status of 403 () @ https://app1.hyeonworks.com/logout:0
@@ -0,0 +1,2 @@
+[     275ms] [ERROR] Failed to load resource: the server responded with a status of 502 () @ https://app2.hyeonworks.com/oauth2/callback?state=G2-BDWkehNWO7hGwhYCxXBVRKZ6AomLIrSLBtIXr0Gw%3A%2Fapi%2Fecho&session_state=vsW8xDlLJN3DUl-0B-X1WL7Q&iss=https%3A%2F%2Fauth.hyeonworks.com%2Frealms%2Fkeycloak-patterns&code=4155f58e-6a58-e47b-93bd-7e2b625c2b91.vsW8xDlLJN3DUl-0B-X1WL7Q.80431dbc-af81-4673-9790-ad06d1570b2e:0
+[     408ms] [ERROR] Failed to load resource: the server responded with a status of 502 () @ https://app2.hyeonworks.com/oauth2/callback?state=Da-7OcMB4f7vyHgr-6CqrTtJpmj1R_SfRfcE3CUJNzE%3A%2Ffavicon.ico&session_state=vsW8xDlLJN3DUl-0B-X1WL7Q&iss=https%3A%2F%2Fauth.hyeonworks.com%2Frealms%2Fkeycloak-patterns&code=96d66247-91b0-0cc1-89dc-e527c2b69bf2.vsW8xDlLJN3DUl-0B-X1WL7Q.80431dbc-af81-4673-9790-ad06d1570b2e:0
@@ -0,0 +1,2 @@
+[     266ms] [ERROR] Failed to load resource: the server responded with a status of 502 () @ https://app2.hyeonworks.com/oauth2/callback?state=TZnQvjIWCEySrf4PMg2WLVFoOfkyOJWB58f2LGjVfpo%3A%2Fapi%2Fecho&session_state=vsW8xDlLJN3DUl-0B-X1WL7Q&iss=https%3A%2F%2Fauth.hyeonworks.com%2Frealms%2Fkeycloak-patterns&code=8ae913a1-2647-0ed9-625e-3d80e1565024.vsW8xDlLJN3DUl-0B-X1WL7Q.80431dbc-af81-4673-9790-ad06d1570b2e:0
+[     416ms] [ERROR] Failed to load resource: the server responded with a status of 502 () @ https://app2.hyeonworks.com/oauth2/callback?state=uAYwZp59ncz95XjkJXAlIgsT7oksBQBViiQS07t2eow%3A%2Ffavicon.ico&session_state=vsW8xDlLJN3DUl-0B-X1WL7Q&iss=https%3A%2F%2Fauth.hyeonworks.com%2Frealms%2Fkeycloak-patterns&code=7b7fc816-0b27-93a0-83b8-656488813253.vsW8xDlLJN3DUl-0B-X1WL7Q.80431dbc-af81-4673-9790-ad06d1570b2e:0
@@ -0,0 +1,2 @@
+[     287ms] [ERROR] Failed to load resource: the server responded with a status of 502 () @ https://app2.hyeonworks.com/oauth2/callback?state=0EOFj1PoLyPil0dgukpi7zKW4JKnGZTP9Wj6EhTR-lw%3A%2Fapi%2Fecho&session_state=vsW8xDlLJN3DUl-0B-X1WL7Q&iss=https%3A%2F%2Fauth.hyeonworks.com%2Frealms%2Fkeycloak-patterns&code=d13cc206-133f-00a9-9908-599988c4d7cf.vsW8xDlLJN3DUl-0B-X1WL7Q.80431dbc-af81-4673-9790-ad06d1570b2e:0
+[     457ms] [ERROR] Failed to load resource: the server responded with a status of 502 () @ https://app2.hyeonworks.com/oauth2/callback?state=kbYC5O4_ELsoQFw85vyYfgWEqlI2yWImB4rmelbmSTM%3A%2Ffavicon.ico&session_state=vsW8xDlLJN3DUl-0B-X1WL7Q&iss=https%3A%2F%2Fauth.hyeonworks.com%2Frealms%2Fkeycloak-patterns&code=91f9fde9-f376-b6f3-4622-a1ba674cc4fd.vsW8xDlLJN3DUl-0B-X1WL7Q.80431dbc-af81-4673-9790-ad06d1570b2e:0
@@ -0,0 +1 @@
+[     307ms] [ERROR] Failed to load resource: the server responded with a status of 401 () @ https://app2.hyeonworks.com/favicon.ico:0
@@ -0,0 +1 @@
+[     261ms] [ERROR] Failed to load resource: the server responded with a status of 401 () @ https://app2.hyeonworks.com/favicon.ico:0
@@ -0,0 +1 @@
+[     882ms] [ERROR] Failed to load resource: the server responded with a status of 401 () @ https://app2.hyeonworks.com/favicon.ico:0
@@ -0,0 +1 @@
+[     178ms] [ERROR] Failed to load resource: the server responded with a status of 401 () @ https://app2.hyeonworks.com/favicon.ico:0
@@ -0,0 +1,56 @@
+- generic [ref=f18e4]:
+  - link "Skip to main content" [ref=f18e5] [cursor=pointer]:
+    - /url: "#pageContent"
+  - banner [ref=f18e7]:
+    - generic [ref=f18e8]:
+      - link [ref=f18e10] [cursor=pointer]:
+        - /url: /
+        - img "Grafana" [ref=f18e11]
+      - generic [ref=f18e14]:
+        - button "Search or jump to..." [ref=f18e18] [cursor=pointer]
+        - generic [ref=f18e19]: ctrl+k
+      - generic [ref=f18e23]:
+        - button "New" [ref=f18e24] [cursor=pointer]
+        - button "Help" [ref=f18e30] [cursor=pointer]
+        - button "News" [ref=f18e33] [cursor=pointer]
+        - button "Profile" [ref=f18e36] [cursor=pointer]:
+          - img "User avatar" [ref=f18e37]
+    - generic [ref=f18e38]:
+      - button "Open menu" [ref=f18e40] [cursor=pointer]
+      - navigation "Breadcrumbs" [ref=f18e43]:
+        - list [ref=f18e44]:
+          - listitem [ref=f18e45]:
+            - link "Home" [ref=f18e46] [cursor=pointer]:
+              - /url: /
+          - listitem [ref=f18e50]:
+            - link "Explore" [ref=f18e51] [cursor=pointer]:
+              - /url: /explore
+          - listitem [ref=f18e55]:
+            - generic "Prometheus" [ref=f18e56]
+      - generic [ref=f18e57]:
+        - button "Show more items" [ref=f18e60] [cursor=pointer]
+        - button "Toggle top search bar" [ref=f18e64] [cursor=pointer]
+  - main [ref=f18e70]:
+    - generic [ref=f18e72]:
+      - heading "Explore" [level=1] [ref=f18e73]
+      - generic [ref=f18e78]:
+        - navigation "Explore toolbar" [ref=f18e80]:
+          - navigation "Search links" [ref=f18e82]:
+            - generic [ref=f18e83]:
+              - button "Content outline" [expanded] [ref=f18e85] [cursor=pointer]:
+                - generic [ref=f18e88]: Outline
+              - generic [ref=f18e93] [cursor=pointer]:
+                - img "Prometheus logo" [ref=f18e95]
+                - textbox "Select a data source" [ref=f18e96]:
+                  - /placeholder: ""
+          - button "Show more items" [ref=f18e102] [cursor=pointer]
+        - generic [ref=f18e106]:
+          - button "Collapse outline" [expanded] [ref=f18e112] [cursor=pointer]:
+            - img "arrow-from-right" [ref=f18e113]
+          - generic [ref=f18e120]:
+            - generic [ref=f18e123]:
+              - button "Add query" [ref=f18e124] [cursor=pointer]
+              - button "Query history" [ref=f18e128] [cursor=pointer]
+              - button "Query inspector" [ref=f18e132] [cursor=pointer]
+            - generic:
+              - main
@@ -0,0 +1,7 @@
+- main [ref=f21e2]:
+  - heading "AP3 · Backend-for-Frontend" [level=1] [ref=f21e3]
+  - paragraph [ref=f21e4]: 브라우저에는 OAuth token이 전혀 전달되지 않습니다. HttpOnly session cookie로 BFF만 호출하고, BFF가 서버 보관 access token을 Resource Server 요청에 붙입니다.
+  - button "Keycloak 로그인" [ref=f21e5] [cursor=pointer]
+  - button "token 경계 확인" [ref=f21e6] [cursor=pointer]
+  - button "BFF 경유 API 호출" [ref=f21e7] [cursor=pointer]
+  - button "CSRF token으로 상태 변경" [ref=f21e8] [cursor=pointer]
@@ -0,0 +1,16 @@
+- generic [ref=f22e3]:
+  - banner [ref=f22e4]:
+    - generic [ref=f22e5]: keycloak-patterns
+  - main [ref=f22e6]:
+    - heading "Sign in to your account" [level=1] [ref=f22e8]
+    - generic [ref=f22e12]:
+      - generic [ref=f22e13]:
+        - generic [ref=f22e14]: Username or email
+        - textbox "Username or email" [active] [ref=f22e17]
+      - generic [ref=f22e18]:
+        - generic [ref=f22e19]: Password
+        - generic [ref=f22e21]:
+          - textbox "Password" [ref=f22e24]
+          - button "Show password" [ref=f22e26] [cursor=pointer]:
+            - generic [aria-hidden] [ref=f22e27]: 
+      - button "Sign In" [ref=f22e30] [cursor=pointer]
@@ -0,0 +1,20 @@
+- generic [ref=f23e3]:
+  - banner [ref=f23e4]:
+    - generic [ref=f23e5]: keycloak-patterns
+  - main [ref=f23e6]:
+    - heading "Update Account Information" [level=1] [ref=f23e8]
+    - generic [ref=f23e9]:
+      - generic [ref=f23e10]: "* Required fields"
+      - generic [ref=f23e13]:
+        - generic [ref=f23e14]:
+          - generic [ref=f23e15]: Email *
+          - textbox "Email" [ref=f23e19]: labuser@example.com
+        - generic [ref=f23e20]:
+          - generic [ref=f23e21]: First name *
+          - textbox "First name" [invalid] [ref=f23e25]
+          - generic [ref=f23e26]: Please specify this field.
+        - generic [ref=f23e31]:
+          - generic [ref=f23e32]: Last name *
+          - textbox "Last name" [invalid] [ref=f23e36]
+          - generic [ref=f23e37]: Please specify this field.
+        - button "Submit" [ref=f23e44]
@@ -0,0 +1,20 @@
+- generic [ref=f23e3]:
+  - banner [ref=f23e4]:
+    - generic [ref=f23e5]: keycloak-patterns
+  - main [ref=f23e6]:
+    - heading "Update Account Information" [level=1] [ref=f23e8]
+    - generic [ref=f23e9]:
+      - generic [ref=f23e10]: "* Required fields"
+      - generic [ref=f23e13]:
+        - generic [ref=f23e14]:
+          - generic [ref=f23e15]: Email *
+          - textbox "Email" [ref=f23e19]: labuser@example.com
+        - generic [ref=f23e20]:
+          - generic [ref=f23e21]: First name *
+          - textbox "First name" [invalid] [ref=f23e25]: Lab
+          - generic [ref=f23e26]: Please specify this field.
+        - generic [ref=f23e31]:
+          - generic [ref=f23e32]: Last name *
+          - textbox "Last name" [active] [invalid] [ref=f23e36]: User
+          - generic [ref=f23e37]: Please specify this field.
+        - button "Submit" [ref=f23e44]
@@ -0,0 +1,7 @@
+- main [ref=f24e2]:
+  - heading "AP3 · Backend-for-Frontend" [level=1] [ref=f24e3]
+  - paragraph [ref=f24e4]: 브라우저에는 OAuth token이 전혀 전달되지 않습니다. HttpOnly session cookie로 BFF만 호출하고, BFF가 서버 보관 access token을 Resource Server 요청에 붙입니다.
+  - button "Keycloak 로그인" [ref=f24e5] [cursor=pointer]
+  - button "token 경계 확인" [ref=f24e6] [cursor=pointer]
+  - button "BFF 경유 API 호출" [ref=f24e7] [cursor=pointer]
+  - button "CSRF token으로 상태 변경" [ref=f24e8] [cursor=pointer]
@@ -0,0 +1,16 @@
+- generic [ref=f25e3]:
+  - banner [ref=f25e4]:
+    - generic [ref=f25e5]: keycloak-patterns
+  - main [ref=f25e6]:
+    - heading "Sign in to your account" [level=1] [ref=f25e8]
+    - generic [ref=f25e12]:
+      - generic [ref=f25e13]:
+        - generic [ref=f25e14]: Username or email
+        - textbox "Username or email" [active] [ref=f25e17]
+      - generic [ref=f25e18]:
+        - generic [ref=f25e19]: Password
+        - generic [ref=f25e21]:
+          - textbox "Password" [ref=f25e24]
+          - button "Show password" [ref=f25e26] [cursor=pointer]:
+            - generic [aria-hidden] [ref=f25e27]: 
+      - button "Sign In" [ref=f25e30] [cursor=pointer]
@@ -0,0 +1,9 @@
+- generic [ref=f26e2]:
+  - heading "Login with OAuth 2.0" [level=2] [ref=f26e3]
+  - alert [ref=f26e4]: Invalid credentials
+  - table [ref=f26e5]:
+    - rowgroup [ref=f26e6]:
+      - row [ref=f26e7]:
+        - cell [ref=f26e8]:
+          - link "keycloak" [ref=f26e9] [cursor=pointer]:
+            - /url: /oauth2/authorization/keycloak
@@ -0,0 +1,7 @@
+- main [ref=f27e2]:
+  - heading "AP3 · Backend-for-Frontend" [level=1] [ref=f27e3]
+  - paragraph [ref=f27e4]: 브라우저에는 OAuth token이 전혀 전달되지 않습니다. HttpOnly session cookie로 BFF만 호출하고, BFF가 서버 보관 access token을 Resource Server 요청에 붙입니다.
+  - button "Keycloak 로그인" [ref=f27e5] [cursor=pointer]
+  - button "token 경계 확인" [ref=f27e6] [cursor=pointer]
+  - button "BFF 경유 API 호출" [ref=f27e7] [cursor=pointer]
+  - button "CSRF token으로 상태 변경" [ref=f27e8] [cursor=pointer]
@@ -0,0 +1,7 @@
+- main [ref=f27e2]:
+  - heading "AP3 · Backend-for-Frontend" [level=1] [ref=f27e3]
+  - paragraph [ref=f27e4]: 브라우저에는 OAuth token이 전혀 전달되지 않습니다. HttpOnly session cookie로 BFF만 호출하고, BFF가 서버 보관 access token을 Resource Server 요청에 붙입니다.
+  - button "Keycloak 로그인" [ref=f27e5] [cursor=pointer]
+  - button "token 경계 확인" [ref=f27e6] [cursor=pointer]
+  - button "BFF 경유 API 호출" [ref=f27e7] [cursor=pointer]
+  - button "CSRF token으로 상태 변경" [ref=f27e8] [cursor=pointer]
@@ -0,0 +1,7 @@
+- main [ref=f27e2]:
+  - heading "AP3 · Backend-for-Frontend" [level=1] [ref=f27e3]
+  - paragraph [ref=f27e4]: 브라우저에는 OAuth token이 전혀 전달되지 않습니다. HttpOnly session cookie로 BFF만 호출하고, BFF가 서버 보관 access token을 Resource Server 요청에 붙입니다.
+  - button "Keycloak 로그인" [ref=f27e5] [cursor=pointer]
+  - button "token 경계 확인" [ref=f27e6] [cursor=pointer]
+  - button "BFF 경유 API 호출" [ref=f27e7] [cursor=pointer]
+  - button "CSRF token으로 상태 변경" [ref=f27e8] [cursor=pointer]
@@ -0,0 +1 @@
+- generic [active] [ref=f28e1]: "{\"pattern\":\"AP3-backend-for-frontend\",\"principal\":\"labuser\",\"accessTokenStoredOnServer\":true,\"refreshTokenStoredOnServer\":true,\"browserTokenCount\":0,\"csrfProtectionEnabled\":true}"
@@ -0,0 +1,7 @@
+- main [ref=f29e2]:
+  - heading "AP3 · Backend-for-Frontend" [level=1] [ref=f29e3]
+  - paragraph [ref=f29e4]: 브라우저에는 OAuth token이 전혀 전달되지 않습니다. HttpOnly session cookie로 BFF만 호출하고, BFF가 서버 보관 access token을 Resource Server 요청에 붙입니다.
+  - button "Keycloak 로그인" [ref=f29e5] [cursor=pointer]
+  - button "token 경계 확인" [ref=f29e6] [cursor=pointer]
+  - button "BFF 경유 API 호출" [ref=f29e7] [cursor=pointer]
+  - button "CSRF token으로 상태 변경" [ref=f29e8] [cursor=pointer]
@@ -0,0 +1 @@
+- generic [active] [ref=f30e1]: "{\"pattern\":\"AP3-backend-for-frontend\",\"principal\":\"labuser\",\"accessTokenStoredOnServer\":false,\"refreshTokenStoredOnServer\":false,\"browserTokenCount\":0,\"csrfProtectionEnabled\":true}"
@@ -0,0 +1,5 @@
+- generic [active] [ref=f31e1]:
+  - heading "Whitelabel Error Page" [level=1] [ref=f31e2]
+  - paragraph [ref=f31e3]: This application has no explicit mapping for /error, so you are seeing this as a fallback.
+  - generic [ref=f31e4]: Fri Sep 04 05:00:51 GMT 2026
+  - generic [ref=f31e5]: There was an unexpected error (type=Internal Server Error, status=500).
@@ -0,0 +1 @@
+- generic [active] [ref=f32e1]: "{\"pattern\":\"AP3-backend-for-frontend\",\"principal\":\"labuser\",\"accessTokenStoredOnServer\":false,\"refreshTokenStoredOnServer\":false,\"browserTokenCount\":0,\"csrfProtectionEnabled\":true}"
@@ -0,0 +1,7 @@
+- main [ref=f33e2]:
+  - heading "AP3 · Backend-for-Frontend" [level=1] [ref=f33e3]
+  - paragraph [ref=f33e4]: 브라우저에는 OAuth token이 전혀 전달되지 않습니다. HttpOnly session cookie로 BFF만 호출하고, BFF가 서버 보관 access token을 Resource Server 요청에 붙입니다.
+  - button "Keycloak 로그인" [ref=f33e5] [cursor=pointer]
+  - button "token 경계 확인" [ref=f33e6] [cursor=pointer]
+  - button "BFF 경유 API 호출" [ref=f33e7] [cursor=pointer]
+  - button "CSRF token으로 상태 변경" [ref=f33e8] [cursor=pointer]
@@ -0,0 +1 @@
+- generic [active] [ref=f34e1]: "{\"pattern\":\"AP3-backend-for-frontend\",\"principal\":\"labuser\",\"accessTokenStoredOnServer\":false,\"refreshTokenStoredOnServer\":false,\"browserTokenCount\":0,\"csrfProtectionEnabled\":true}"
@@ -0,0 +1 @@
+- generic [active] [ref=f35e1]: "{\"pattern\":\"AP3-backend-for-frontend\",\"principal\":\"labuser\",\"accessTokenStoredOnServer\":false,\"refreshTokenStoredOnServer\":false,\"browserTokenCount\":0,\"csrfProtectionEnabled\":true}"
@@ -0,0 +1,7 @@
+- main [ref=f36e2]:
+  - heading "AP3 · Backend-for-Frontend" [level=1] [ref=f36e3]
+  - paragraph [ref=f36e4]: 브라우저에는 OAuth token이 전혀 전달되지 않습니다. HttpOnly session cookie로 BFF만 호출하고, BFF가 서버 보관 access token을 Resource Server 요청에 붙입니다.
+  - button "Keycloak 로그인" [ref=f36e5] [cursor=pointer]
+  - button "token 경계 확인" [ref=f36e6] [cursor=pointer]
+  - button "BFF 경유 API 호출" [ref=f36e7] [cursor=pointer]
+  - button "CSRF token으로 상태 변경" [ref=f36e8] [cursor=pointer]
@@ -0,0 +1 @@
+- generic [active] [ref=f37e1]: "{\"pattern\":\"AP3-backend-for-frontend\",\"principal\":\"labuser\",\"accessTokenStoredOnServer\":true,\"refreshTokenStoredOnServer\":true,\"browserTokenCount\":0,\"csrfProtectionEnabled\":true}"
@@ -0,0 +1,7 @@
+- main [ref=f38e2]:
+  - heading "AP3 · Backend-for-Frontend" [level=1] [ref=f38e3]
+  - paragraph [ref=f38e4]: 브라우저에는 OAuth token이 전혀 전달되지 않습니다. HttpOnly session cookie로 BFF만 호출하고, BFF가 서버 보관 access token을 Resource Server 요청에 붙입니다.
+  - button "Keycloak 로그인" [ref=f38e5] [cursor=pointer]
+  - button "token 경계 확인" [ref=f38e6] [cursor=pointer]
+  - button "BFF 경유 API 호출" [ref=f38e7] [cursor=pointer]
+  - button "CSRF token으로 상태 변경" [ref=f38e8] [cursor=pointer]
@@ -0,0 +1,7 @@
+- main [ref=f39e2]:
+  - heading "AP3 · Backend-for-Frontend" [level=1] [ref=f39e3]
+  - paragraph [ref=f39e4]: 브라우저에는 OAuth token이 전혀 전달되지 않습니다. HttpOnly session cookie로 BFF만 호출하고, BFF가 서버 보관 access token을 Resource Server 요청에 붙입니다.
+  - button "Keycloak 로그인" [ref=f39e5] [cursor=pointer]
+  - button "token 경계 확인" [ref=f39e6] [cursor=pointer]
+  - button "BFF 경유 API 호출" [ref=f39e7] [cursor=pointer]
+  - button "CSRF token으로 상태 변경" [ref=f39e8] [cursor=pointer]
@@ -0,0 +1,4 @@
+- generic [active] [ref=f40e1]:
+  - heading "502 Bad Gateway" [level=1] [ref=f40e3]
+  - separator [ref=f40e4]
+  - generic [ref=f40e5]: nginx/1.30.4
@@ -0,0 +1,4 @@
+- generic [active] [ref=f41e1]:
+  - heading "502 Bad Gateway" [level=1] [ref=f41e3]
+  - separator [ref=f41e4]
+  - generic [ref=f41e5]: nginx/1.30.4
@@ -0,0 +1,4 @@
+- generic [active] [ref=f42e1]:
+  - heading "502 Bad Gateway" [level=1] [ref=f42e3]
+  - separator [ref=f42e4]
+  - generic [ref=f42e5]: nginx/1.30.4
@@ -0,0 +1 @@
+- generic [active] [ref=f43e1]: "{ \"headers\" : { \"host\" : [ \"app2.hyeonworks.com\" ], \"user-agent\" : [ \"Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/152.0.0.0 Safari/537.36\" ], \"accept\" : [ \"text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7\" ], \"accept-encoding\" : [ \"gzip, deflate, br, zstd\" ], \"accept-language\" : [ \"en-US,en;q=0.9\" ], \"cookie\" : [ \"grafana_session=60c3e7ae41ffc00665f4a2c377def399; grafana_session_expiry=1788497124; _oauth2_proxy=djIuWDI5aGRYUm9NbDl3Y205NGVTMWlNall4TVRGbVltUXhabVJoWWpOaFpUSXhPREpsTWpnM01EQXhZakF5WVEuTk81VE82RHRod2NWZWstaHpPZVg1Zw==|1788500470|iPSRUlwHDB0XgC6sUdU4dq1EHq9WQDPYrDoezajKVUA=\" ], \"priority\" : [ \"u=0, i\" ], \"sec-ch-ua\" : [ \"\\\"Chromium\\\";v=\\\"152\\\", \\\"Not?A_Brand\\\";v=\\\"24\\\", \\\"Google Chrome\\\";v=\\\"152\\\"\" ], \"sec-ch-ua-mobile\" : [ \"?0\" ], \"sec-ch-ua-platform\" : [ \"\\\"Linux\\\"\" ], \"sec-fetch-dest\" : [ \"document\" ], \"sec-fetch-mode\" : [ \"navigate\" ], \"sec-fetch-site\" : [ \"none\" ], \"sec-fetch-user\" : [ \"?1\" ], \"upgrade-insecure-requests\" : [ \"1\" ], \"x-forwarded-email\" : [ \"labuser@example.com\" ], \"x-forwarded-host\" : [ \"app2.hyeonworks.com\" ], \"x-forwarded-port\" : [ \"443\" ], \"x-forwarded-preferred-username\" : [ \"labuser\" ], \"x-forwarded-proto\" : [ \"https\" ], \"x-forwarded-server\" : [ \"traefik-5d6fcf895-wpfhr\" ], \"x-forwarded-user\" : [ \"27df5ea9-8703-4ec5-badd-d972c583e1ff\" ], \"x-real-ip\" : [ \"100.123.124.30\" ] }, \"remoteAddr\" : \"100.123.124.30\", \"localAddr\" : \"10.42.0.53\", \"scheme\" : \"https\", \"secure\" : true, \"serverName\" : \"app2.hyeonworks.com\", \"serverPort\" : 443, \"requestUrl\" : \"https://app2.hyeonworks.com/api/echo\" }"
@@ -0,0 +1 @@
+- generic [active] [ref=f44e1]: "{ \"headers\" : { \"host\" : [ \"app2.hyeonworks.com\" ], \"user-agent\" : [ \"Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/152.0.0.0 Safari/537.36\" ], \"accept\" : [ \"text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7\" ], \"accept-encoding\" : [ \"gzip, deflate, br, zstd\" ], \"accept-language\" : [ \"en-US,en;q=0.9\" ], \"cookie\" : [ \"grafana_session=60c3e7ae41ffc00665f4a2c377def399; grafana_session_expiry=1788497124; _oauth2_proxy=djIuWDI5aGRYUm9NbDl3Y205NGVTMDVOemhrWm1GbFptSmtZV1JqWTJJNU5tTTNZbVV4TmpJMVpHSmhOVFl4TmcucmoxSnJPYjJKOW1ZV191aXVWa2FCZw==|1788500538|RoiStOeQcIDldxB3cckyO-OAiMgBjBfw5gOSvUsgTFU=\" ], \"priority\" : [ \"u=0, i\" ], \"sec-ch-ua\" : [ \"\\\"Chromium\\\";v=\\\"152\\\", \\\"Not?A_Brand\\\";v=\\\"24\\\", \\\"Google Chrome\\\";v=\\\"152\\\"\" ], \"sec-ch-ua-mobile\" : [ \"?0\" ], \"sec-ch-ua-platform\" : [ \"\\\"Linux\\\"\" ], \"sec-fetch-dest\" : [ \"document\" ], \"sec-fetch-mode\" : [ \"navigate\" ], \"sec-fetch-site\" : [ \"none\" ], \"sec-fetch-user\" : [ \"?1\" ], \"upgrade-insecure-requests\" : [ \"1\" ], \"x-forwarded-email\" : [ \"labuser@example.com\" ], \"x-forwarded-host\" : [ \"app2.hyeonworks.com\" ], \"x-forwarded-port\" : [ \"443\" ], \"x-forwarded-preferred-username\" : [ \"labuser\" ], \"x-forwarded-proto\" : [ \"https\" ], \"x-forwarded-server\" : [ \"traefik-5d6fcf895-wpfhr\" ], \"x-forwarded-user\" : [ \"27df5ea9-8703-4ec5-badd-d972c583e1ff\" ], \"x-real-ip\" : [ \"100.123.124.30\" ] }, \"remoteAddr\" : \"100.123.124.30\", \"localAddr\" : \"10.42.1.132\", \"scheme\" : \"https\", \"secure\" : true, \"serverName\" : \"app2.hyeonworks.com\", \"serverPort\" : 443, \"requestUrl\" : \"https://app2.hyeonworks.com/api/echo\" }"
@@ -0,0 +1,16 @@
+- generic [ref=f45e3]:
+  - banner [ref=f45e4]:
+    - generic [ref=f45e5]: keycloak-patterns
+  - main [ref=f45e6]:
+    - heading "Sign in to your account" [level=1] [ref=f45e8]
+    - generic [ref=f45e12]:
+      - generic [ref=f45e13]:
+        - generic [ref=f45e14]: Username or email
+        - textbox "Username or email" [active] [ref=f45e17]
+      - generic [ref=f45e18]:
+        - generic [ref=f45e19]: Password
+        - generic [ref=f45e21]:
+          - textbox "Password" [ref=f45e24]
+          - button "Show password" [ref=f45e26] [cursor=pointer]:
+            - generic [aria-hidden] [ref=f45e27]: 
+      - button "Sign In" [ref=f45e30] [cursor=pointer]
@@ -0,0 +1,7 @@
+- main [ref=f46e2]:
+  - heading "AP3 · Backend-for-Frontend" [level=1] [ref=f46e3]
+  - paragraph [ref=f46e4]: 브라우저에는 OAuth token이 전혀 전달되지 않습니다. HttpOnly session cookie로 BFF만 호출하고, BFF가 서버 보관 access token을 Resource Server 요청에 붙입니다.
+  - button "Keycloak 로그인" [ref=f46e5] [cursor=pointer]
+  - button "token 경계 확인" [ref=f46e6] [cursor=pointer]
+  - button "BFF 경유 API 호출" [ref=f46e7] [cursor=pointer]
+  - button "CSRF token으로 상태 변경" [ref=f46e8] [cursor=pointer]
@@ -0,0 +1 @@
+- generic [active] [ref=f47e1]: "{ \"headers\" : { \"host\" : [ \"app2.hyeonworks.com\" ], \"user-agent\" : [ \"Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/152.0.0.0 Safari/537.36\" ], \"accept\" : [ \"text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7\" ], \"accept-encoding\" : [ \"gzip, deflate, br, zstd\" ], \"accept-language\" : [ \"en-US,en;q=0.9\" ], \"cookie\" : [ \"grafana_session=60c3e7ae41ffc00665f4a2c377def399; grafana_session_expiry=1788497124; _oauth2_proxy=djIuWDI5aGRYUm9NbDl3Y205NGVTMDJZakF5T0dFM01HWTJPV000WmpCa1lUazVOalpsWWpNMk9UY3laR1ptTWcuWmpUamNTbGxVSHV1RmJjQ2ZRd2lsUQ==|1788500797|17Hbo3RDtzOldnLZx2xOt3e34lHo_v0yqRNdqdKUx-g=\" ], \"priority\" : [ \"u=0, i\" ], \"sec-ch-ua\" : [ \"\\\"Chromium\\\";v=\\\"152\\\", \\\"Not?A_Brand\\\";v=\\\"24\\\", \\\"Google Chrome\\\";v=\\\"152\\\"\" ], \"sec-ch-ua-mobile\" : [ \"?0\" ], \"sec-ch-ua-platform\" : [ \"\\\"Linux\\\"\" ], \"sec-fetch-dest\" : [ \"document\" ], \"sec-fetch-mode\" : [ \"navigate\" ], \"sec-fetch-site\" : [ \"none\" ], \"sec-fetch-user\" : [ \"?1\" ], \"upgrade-insecure-requests\" : [ \"1\" ], \"x-forwarded-email\" : [ \"labuser@example.com\" ], \"x-forwarded-host\" : [ \"app2.hyeonworks.com\" ], \"x-forwarded-port\" : [ \"443\" ], \"x-forwarded-preferred-username\" : [ \"labuser\" ], \"x-forwarded-proto\" : [ \"https\" ], \"x-forwarded-server\" : [ \"traefik-5d6fcf895-wpfhr\" ], \"x-forwarded-user\" : [ \"27df5ea9-8703-4ec5-badd-d972c583e1ff\" ], \"x-real-ip\" : [ \"100.123.124.30\" ] }, \"remoteAddr\" : \"100.123.124.30\", \"localAddr\" : \"10.42.0.53\", \"scheme\" : \"https\", \"secure\" : true, \"serverName\" : \"app2.hyeonworks.com\", \"serverPort\" : 443, \"requestUrl\" : \"https://app2.hyeonworks.com/api/echo\" }"
@@ -0,0 +1 @@
+- generic [active] [ref=f48e1]: "{\"pattern\":\"AP3-backend-for-frontend\",\"principal\":\"labuser\",\"accessTokenStoredOnServer\":true,\"refreshTokenStoredOnServer\":true,\"browserTokenCount\":0,\"csrfProtectionEnabled\":true}"
@@ -0,0 +1 @@
+- generic [active] [ref=f49e1]: "{ \"headers\" : { \"host\" : [ \"app2.hyeonworks.com\" ], \"user-agent\" : [ \"Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/152.0.0.0 Safari/537.36\" ], \"accept\" : [ \"text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7\" ], \"accept-encoding\" : [ \"gzip, deflate, br, zstd\" ], \"accept-language\" : [ \"en-US,en;q=0.9\" ], \"cookie\" : [ \"grafana_session=60c3e7ae41ffc00665f4a2c377def399; grafana_session_expiry=1788497124; _oauth2_proxy=djIuWDI5aGRYUm9NbDl3Y205NGVTMDJZakF5T0dFM01HWTJPV000WmpCa1lUazVOalpsWWpNMk9UY3laR1ptTWcuWmpUamNTbGxVSHV1RmJjQ2ZRd2lsUQ==|1788500797|17Hbo3RDtzOldnLZx2xOt3e34lHo_v0yqRNdqdKUx-g=\" ], \"priority\" : [ \"u=0, i\" ], \"sec-ch-ua\" : [ \"\\\"Chromium\\\";v=\\\"152\\\", \\\"Not?A_Brand\\\";v=\\\"24\\\", \\\"Google Chrome\\\";v=\\\"152\\\"\" ], \"sec-ch-ua-mobile\" : [ \"?0\" ], \"sec-ch-ua-platform\" : [ \"\\\"Linux\\\"\" ], \"sec-fetch-dest\" : [ \"document\" ], \"sec-fetch-mode\" : [ \"navigate\" ], \"sec-fetch-site\" : [ \"none\" ], \"sec-fetch-user\" : [ \"?1\" ], \"upgrade-insecure-requests\" : [ \"1\" ], \"x-forwarded-email\" : [ \"labuser@example.com\" ], \"x-forwarded-host\" : [ \"app2.hyeonworks.com\" ], \"x-forwarded-port\" : [ \"443\" ], \"x-forwarded-preferred-username\" : [ \"labuser\" ], \"x-forwarded-proto\" : [ \"https\" ], \"x-forwarded-server\" : [ \"traefik-5d6fcf895-wpfhr\" ], \"x-forwarded-user\" : [ \"27df5ea9-8703-4ec5-badd-d972c583e1ff\" ], \"x-real-ip\" : [ \"100.123.124.30\" ] }, \"remoteAddr\" : \"100.123.124.30\", \"localAddr\" : \"10.42.0.53\", \"scheme\" : \"https\", \"secure\" : true, \"serverName\" : \"app2.hyeonworks.com\", \"serverPort\" : 443, \"requestUrl\" : \"https://app2.hyeonworks.com/api/echo\" }"
@@ -0,0 +1 @@
+- generic [active] [ref=f50e1]: "{\"pattern\":\"AP3-backend-for-frontend\",\"principal\":\"labuser\",\"accessTokenStoredOnServer\":true,\"refreshTokenStoredOnServer\":true,\"browserTokenCount\":0,\"csrfProtectionEnabled\":true}"
@@ -0,0 +1,16 @@
+- generic [ref=f51e3]:
+  - banner [ref=f51e4]:
+    - generic [ref=f51e5]: keycloak-patterns
+  - main [ref=f51e6]:
+    - heading "Sign in to your account" [level=1] [ref=f51e8]
+    - generic [ref=f51e12]:
+      - generic [ref=f51e13]:
+        - generic [ref=f51e14]: Username or email
+        - textbox "Username or email" [active] [ref=f51e17]
+      - generic [ref=f51e18]:
+        - generic [ref=f51e19]: Password
+        - generic [ref=f51e21]:
+          - textbox "Password" [ref=f51e24]
+          - button "Show password" [ref=f51e26] [cursor=pointer]:
+            - generic [aria-hidden] [ref=f51e27]: 
+      - button "Sign In" [ref=f51e30] [cursor=pointer]
@@ -0,0 +1,7 @@
+- main [ref=f52e2]:
+  - heading "AP3 · Backend-for-Frontend" [level=1] [ref=f52e3]
+  - paragraph [ref=f52e4]: 브라우저에는 OAuth token이 전혀 전달되지 않습니다. HttpOnly session cookie로 BFF만 호출하고, BFF가 서버 보관 access token을 Resource Server 요청에 붙입니다.
+  - button "Keycloak 로그인" [ref=f52e5] [cursor=pointer]
+  - button "token 경계 확인" [ref=f52e6] [cursor=pointer]
+  - button "BFF 경유 API 호출" [ref=f52e7] [cursor=pointer]
+  - button "CSRF token으로 상태 변경" [ref=f52e8] [cursor=pointer]
@@ -0,0 +1,16 @@
+- generic [ref=f53e3]:
+  - banner [ref=f53e4]:
+    - generic [ref=f53e5]: keycloak-patterns
+  - main [ref=f53e6]:
+    - heading "Sign in to your account" [level=1] [ref=f53e8]
+    - generic [ref=f53e12]:
+      - generic [ref=f53e13]:
+        - generic [ref=f53e14]: Username or email
+        - textbox "Username or email" [ref=f53e17]
+      - generic [ref=f53e18]:
+        - generic [ref=f53e19]: Password
+        - generic [ref=f53e21]:
+          - textbox "Password" [ref=f53e24]
+          - button "Show password" [ref=f53e26] [cursor=pointer]:
+            - generic [aria-hidden] [ref=f53e27]: 
+      - button "Sign In" [ref=f53e30] [cursor=pointer]
@@ -0,0 +1,16 @@
+- generic [ref=f53e3]:
+  - banner [ref=f53e4]:
+    - generic [ref=f53e5]: keycloak-patterns
+  - main [ref=f53e6]:
+    - heading "Sign in to your account" [level=1] [ref=f53e8]
+    - generic [ref=f53e12]:
+      - generic [ref=f53e13]:
+        - generic [ref=f53e14]: Username or email
+        - textbox "Username or email" [ref=f53e17]: labuser
+      - generic [ref=f53e18]:
+        - generic [ref=f53e19]: Password
+        - generic [ref=f53e21]:
+          - textbox "Password" [active] [ref=f53e24]: labpass
+          - button "Show password" [ref=f53e26] [cursor=pointer]:
+            - generic [aria-hidden] [ref=f53e27]: 
+      - button "Sign In" [ref=f53e30] [cursor=pointer]
@@ -0,0 +1,16 @@
+- generic [ref=f53e3]:
+  - banner [ref=f53e4]:
+    - generic [ref=f53e5]: keycloak-patterns
+  - main [ref=f53e6]:
+    - heading "Sign in to your account" [level=1] [ref=f53e8]
+    - generic [ref=f53e12]:
+      - generic [ref=f53e13]:
+        - generic [ref=f53e14]: Username or email
+        - textbox "Username or email" [ref=f53e17]: labuser
+      - generic [ref=f53e18]:
+        - generic [ref=f53e19]: Password
+        - generic [ref=f53e21]:
+          - textbox "Password" [active] [ref=f53e24]: labpass
+          - button "Show password" [ref=f53e26] [cursor=pointer]:
+            - generic [aria-hidden] [ref=f53e27]: 
+      - button "Sign In" [ref=f53e30] [cursor=pointer]
@@ -0,0 +1,16 @@
+- generic [ref=f53e3]:
+  - banner [ref=f53e4]:
+    - generic [ref=f53e5]: keycloak-patterns
+  - main [ref=f53e6]:
+    - heading "Sign in to your account" [level=1] [ref=f53e8]
+    - generic [ref=f53e12]:
+      - generic [ref=f53e13]:
+        - generic [ref=f53e14]: Username or email
+        - textbox "Username or email" [ref=f53e17]: labuser
+      - generic [ref=f53e18]:
+        - generic [ref=f53e19]: Password
+        - generic [ref=f53e21]:
+          - textbox "Password" [active] [ref=f53e24]: labpass
+          - button "Show password" [ref=f53e26] [cursor=pointer]:
+            - generic [aria-hidden] [ref=f53e27]: 
+      - button "Sign In" [ref=f53e30] [cursor=pointer]
@@ -0,0 +1,16 @@
+- generic [ref=f54e3]:
+  - banner [ref=f54e4]:
+    - generic [ref=f54e5]: keycloak-patterns
+  - main [ref=f54e6]:
+    - heading "Sign in to your account" [level=1] [ref=f54e8]
+    - generic [ref=f54e12]:
+      - generic [ref=f54e13]:
+        - generic [ref=f54e14]: Username or email
+        - textbox "Username or email" [ref=f54e17]
+      - generic [ref=f54e18]:
+        - generic [ref=f54e19]: Password
+        - generic [ref=f54e21]:
+          - textbox "Password" [ref=f54e24]
+          - button "Show password" [ref=f54e26] [cursor=pointer]:
+            - generic [aria-hidden] [ref=f54e27]: 
+      - button "Sign In" [ref=f54e30] [cursor=pointer]
@@ -0,0 +1,16 @@
+- generic [ref=f54e3]:
+  - banner [ref=f54e4]:
+    - generic [ref=f54e5]: keycloak-patterns
+  - main [ref=f54e6]:
+    - heading "Sign in to your account" [level=1] [ref=f54e8]
+    - generic [ref=f54e12]:
+      - generic [ref=f54e13]:
+        - generic [ref=f54e14]: Username or email
+        - textbox "Username or email" [ref=f54e17]: labuser
+      - generic [ref=f54e18]:
+        - generic [ref=f54e19]: Password
+        - generic [ref=f54e21]:
+          - textbox "Password" [active] [ref=f54e24]: labpass
+          - button "Show password" [ref=f54e26] [cursor=pointer]:
+            - generic [aria-hidden] [ref=f54e27]: 
+      - button "Sign In" [ref=f54e30] [cursor=pointer]
@@ -0,0 +1 @@
+target/
@@ -0,0 +1,14 @@
+FROM maven:3.9.11-eclipse-temurin-21-alpine AS build
+WORKDIR /workspace
+COPY pom.xml .
+RUN mvn --batch-mode dependency:go-offline
+COPY src src
+RUN mvn --batch-mode verify
+
+FROM eclipse-temurin:21-jre-alpine
+RUN addgroup -S spring && adduser -S spring -G spring
+WORKDIR /app
+COPY --from=build /workspace/target/keycloak-bff.jar app.jar
+USER spring:spring
+EXPOSE 8083
+ENTRYPOINT ["java", "-jar", "/app/app.jar"]
@@ -0,0 +1,90 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <parent>
+        <groupId>org.springframework.boot</groupId>
+        <artifactId>spring-boot-starter-parent</artifactId>
+        <version>3.5.16</version>
+        <relativePath/>
+    </parent>
+
+    <groupId>com.example</groupId>
+    <artifactId>keycloak-bff</artifactId>
+    <version>0.0.1-SNAPSHOT</version>
+    <name>keycloak-bff</name>
+
+    <properties>
+        <java.version>21</java.version>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-actuator</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-oauth2-client</artifactId>
+        </dependency>
+
+        <!-- B-1: Application Session 을 Redis 로 옮긴다.
+             spring-session-data-redis 가 SessionRepository 를 갈아끼우고,
+             spring-boot-starter-data-redis 가 연결(Lettuce)을 제공한다.
+             둘 다 있어야 자동구성이 걸린다 — 하나만 넣으면 조용히 in-memory 로 남는다. -->
+        <dependency>
+            <groupId>org.springframework.session</groupId>
+            <artifactId>spring-session-data-redis</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-data-redis</artifactId>
+        </dependency>
+
+        <!-- B-2: OAuth2AuthorizedClient 를 PostgreSQL 로 옮긴다.
+             Q3 가 후보로 든 "Redis 와 JDBC 중 무엇" 에서 JDBC 쪽이며,
+             JdbcOAuth2AuthorizedClientService 는 같은 인터페이스라
+             컨트롤러를 바꾸지 않아도 된다. -->
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-jdbc</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.postgresql</groupId>
+            <artifactId>postgresql</artifactId>
+            <scope>runtime</scope>
+        </dependency>
+        <dependency>
+            <groupId>com.h2database</groupId>
+            <artifactId>h2</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-web</artifactId>
+        </dependency>
+
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-test</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.security</groupId>
+            <artifactId>spring-security-test</artifactId>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <finalName>keycloak-bff</finalName>
+        <plugins>
+            <plugin>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-maven-plugin</artifactId>
+            </plugin>
+        </plugins>
+    </build>
+</project>
@@ -0,0 +1,12 @@
+package com.example.keycloakpattern.bff;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class BffApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(BffApplication.class, args);
+    }
+}
@@ -0,0 +1,112 @@
+package com.example.keycloakpattern.bff;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.concurrent.atomic.AtomicReference;
+
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.http.CacheControl;
+import org.springframework.http.HttpHeaders;
+import org.springframework.http.ResponseEntity;
+import org.springframework.security.core.Authentication;
+import org.springframework.security.oauth2.client.OAuth2AuthorizeRequest;
+import org.springframework.security.oauth2.client.OAuth2AuthorizedClient;
+import org.springframework.security.oauth2.client.OAuth2AuthorizedClientManager;
+import org.springframework.security.oauth2.client.OAuth2AuthorizedClientService;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.bind.annotation.RestController;
+import org.springframework.web.client.RestClient;
+import org.springframework.web.server.ResponseStatusException;
+
+import static org.springframework.http.HttpStatus.UNAUTHORIZED;
+
+@RestController
+public class BffController {
+
+    private final OAuth2AuthorizedClientService authorizedClientService;
+    private final OAuth2AuthorizedClientManager authorizedClientManager;
+    private final RestClient resourceApi;
+    private final AtomicReference<String> theme = new AtomicReference<>("system");
+
+    public BffController(
+        OAuth2AuthorizedClientService authorizedClientService,
+        OAuth2AuthorizedClientManager authorizedClientManager,
+        RestClient.Builder restClientBuilder,
+        @Value("${resource-api.base-url}") String resourceApiBaseUrl
+    ) {
+        this.authorizedClientService = authorizedClientService;
+        this.authorizedClientManager = authorizedClientManager;
+        this.resourceApi = restClientBuilder.baseUrl(resourceApiBaseUrl).build();
+    }
+
+    @GetMapping("/bff/token-boundary")
+    ResponseEntity<Map<String, Object>> tokenBoundary(Authentication authentication) {
+        OAuth2AuthorizedClient client = authorizedClientService.loadAuthorizedClient(
+            "keycloak",
+            authentication.getName()
+        );
+
+        Map<String, Object> response = new LinkedHashMap<>();
+        response.put("pattern", "AP3-backend-for-frontend");
+        response.put("principal", authentication.getName());
+        response.put("accessTokenStoredOnServer", client != null
+            && client.getAccessToken() != null);
+        response.put("refreshTokenStoredOnServer", client != null
+            && client.getRefreshToken() != null);
+        response.put("browserTokenCount", 0);
+        response.put("csrfProtectionEnabled", true);
+
+        return ResponseEntity.ok()
+            .cacheControl(CacheControl.noStore())
+            .header("Pragma", "no-cache")
+            .body(response);
+    }
+
+    @GetMapping("/bff/api/me")
+    ResponseEntity<?> currentUser(Authentication authentication) {
+        OAuth2AuthorizedClient client = authorizedClient(authentication);
+        return resourceApi.get()
+            .uri("/api/me")
+            .header(
+                HttpHeaders.AUTHORIZATION,
+                "Bearer " + client.getAccessToken().getTokenValue()
+            )
+            .retrieve()
+            .toEntity(Map.class);
+    }
+
+    @PostMapping("/bff/api/preferences")
+    Map<String, Object> updatePreference(
+        Authentication authentication,
+        @RequestParam(defaultValue = "system") String theme
+    ) {
+        this.theme.set(theme);
+        return Map.of(
+            "updated", true,
+            "theme", this.theme.get(),
+            "principal", authentication.getName()
+        );
+    }
+
+    @GetMapping("/bff/api/preferences")
+    Map<String, String> preference() {
+        return Map.of("theme", theme.get());
+    }
+
+    private OAuth2AuthorizedClient authorizedClient(Authentication authentication) {
+        OAuth2AuthorizeRequest request = OAuth2AuthorizeRequest
+            .withClientRegistrationId("keycloak")
+            .principal(authentication)
+            .build();
+        OAuth2AuthorizedClient client = authorizedClientManager.authorize(request);
+        if (client == null || client.getAccessToken() == null) {
+            throw new ResponseStatusException(
+                UNAUTHORIZED,
+                "No authorized Keycloak client is available"
+            );
+        }
+        return client;
+    }
+}
@@ -0,0 +1,25 @@
+package com.example.keycloakpattern.bff;
+
+import java.util.Map;
+
+import org.springframework.http.CacheControl;
+import org.springframework.http.ResponseEntity;
+import org.springframework.security.web.csrf.CsrfToken;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+public class CsrfController {
+
+    @GetMapping("/bff/csrf")
+    ResponseEntity<Map<String, String>> csrf(CsrfToken csrfToken) {
+        return ResponseEntity.ok()
+            .cacheControl(CacheControl.noStore())
+            .header("Pragma", "no-cache")
+            .body(Map.of(
+                "headerName", csrfToken.getHeaderName(),
+                "parameterName", csrfToken.getParameterName(),
+                "token", csrfToken.getToken()
+            ));
+    }
+}
@@ -0,0 +1,108 @@
+package com.example.keycloakpattern.bff;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.security.config.annotation.web.builders.HttpSecurity;
+import org.springframework.security.oauth2.client.AuthorizedClientServiceOAuth2AuthorizedClientManager;
+import org.springframework.security.oauth2.client.OAuth2AuthorizedClientManager;
+import org.springframework.security.oauth2.client.OAuth2AuthorizedClientProvider;
+import org.springframework.security.oauth2.client.OAuth2AuthorizedClientProviderBuilder;
+import org.springframework.security.oauth2.client.OAuth2AuthorizedClientService;
+import org.springframework.security.oauth2.client.JdbcOAuth2AuthorizedClientService;
+import org.springframework.security.oauth2.client.registration.ClientRegistrationRepository;
+import org.springframework.security.oauth2.client.web.DefaultOAuth2AuthorizationRequestResolver;
+import org.springframework.security.oauth2.client.web.OAuth2AuthorizationRequestCustomizers;
+import org.springframework.security.web.SecurityFilterChain;
+import org.springframework.security.web.csrf.CookieCsrfTokenRepository;
+import org.springframework.jdbc.core.JdbcOperations;
+
+@Configuration
+public class SecurityConfig {
+
+    /**
+     * B-2 — authorized client 를 프로세스 메모리에서 PostgreSQL 로 옮긴다.
+     *
+     * B-1 에서 Application Session 만 Redis 로 옮겼더니, 사용자는 로그인
+     * 상태로 보이는데 BFF 에는 access token 이 없는 상태가 만들어졌다.
+     * 두 상태의 저장소를 **각각** 정해야 한다는 Q3 의 지적이 그대로 나타난 것이다.
+     *
+     * 주의 — 이것이 고치는 것과 고치지 못하는 것이 다르다.
+     *   고친다   : 인스턴스 간 공유. 어느 replica 로 가도 같은 토큰을 본다.
+     *   못 고친다: 조회 키. JdbcOAuth2AuthorizedClientService 도
+     *              (clientRegistrationId, principalName) 으로 찾으므로
+     *              같은 사용자의 두 브라우저는 여전히 한 항목을 공유한다.
+     */
+    @Bean
+    OAuth2AuthorizedClientService authorizedClientService(
+        JdbcOperations jdbcOperations,
+        ClientRegistrationRepository clientRegistrationRepository
+    ) {
+        return new JdbcOAuth2AuthorizedClientService(jdbcOperations, clientRegistrationRepository);
+    }
+
+    @Bean
+    SecurityFilterChain bffSecurity(
+        HttpSecurity http,
+        ClientRegistrationRepository clientRegistrationRepository
+    ) throws Exception {
+        DefaultOAuth2AuthorizationRequestResolver authorizationRequestResolver =
+            new DefaultOAuth2AuthorizationRequestResolver(
+                clientRegistrationRepository,
+                "/oauth2/authorization"
+            );
+        authorizationRequestResolver.setAuthorizationRequestCustomizer(
+            OAuth2AuthorizationRequestCustomizers.withPkce()
+        );
+
+        CookieCsrfTokenRepository csrfTokenRepository =
+            CookieCsrfTokenRepository.withHttpOnlyFalse();
+        csrfTokenRepository.setCookiePath("/");
+
+        return http
+            .csrf(csrf -> csrf
+                .csrfTokenRepository(csrfTokenRepository)
+                .csrfTokenRequestHandler(new SpaCsrfTokenRequestHandler()))
+            .authorizeHttpRequests(authorize -> authorize
+                .requestMatchers(
+                    "/",
+                    "/index.html",
+                    "/app.js",
+                    "/favicon.ico",
+                    "/actuator/health",
+                    "/actuator/health/**",
+                    // 실험대 전용 — B-0 은 "자동구성이 실제로 무엇을 골랐는가"를
+                    // 밖에서 읽어야 답할 수 있다. 운영에서는 절대 열지 않는다:
+                    // /actuator/beans 와 /actuator/env 는 내부 구조와 설정값을
+                    // 그대로 드러낸다.
+                    "/actuator/**"
+                )
+                .permitAll()
+                .anyRequest()
+                .authenticated())
+            .oauth2Login(oauth2 -> oauth2
+                .authorizationEndpoint(endpoint -> endpoint
+                    .authorizationRequestResolver(authorizationRequestResolver))
+                .defaultSuccessUrl("/", true))
+            .build();
+    }
+
+    @Bean
+    OAuth2AuthorizedClientManager authorizedClientManager(
+        ClientRegistrationRepository clientRegistrationRepository,
+        OAuth2AuthorizedClientService authorizedClientService
+    ) {
+        OAuth2AuthorizedClientProvider authorizedClientProvider =
+            OAuth2AuthorizedClientProviderBuilder.builder()
+                .authorizationCode()
+                .refreshToken()
+                .build();
+
+        AuthorizedClientServiceOAuth2AuthorizedClientManager manager =
+            new AuthorizedClientServiceOAuth2AuthorizedClientManager(
+                clientRegistrationRepository,
+                authorizedClientService
+            );
+        manager.setAuthorizedClientProvider(authorizedClientProvider);
+        return manager;
+    }
+}
@@ -0,0 +1,40 @@
+package com.example.keycloakpattern.bff;
+
+import java.util.function.Supplier;
+
+import jakarta.servlet.http.HttpServletRequest;
+import jakarta.servlet.http.HttpServletResponse;
+
+import org.springframework.security.web.csrf.CsrfToken;
+import org.springframework.security.web.csrf.CsrfTokenRequestAttributeHandler;
+import org.springframework.security.web.csrf.CsrfTokenRequestHandler;
+import org.springframework.security.web.csrf.XorCsrfTokenRequestAttributeHandler;
+import org.springframework.util.StringUtils;
+
+final class SpaCsrfTokenRequestHandler implements CsrfTokenRequestHandler {
+
+    private final CsrfTokenRequestHandler plain =
+        new CsrfTokenRequestAttributeHandler();
+    private final CsrfTokenRequestHandler xor =
+        new XorCsrfTokenRequestAttributeHandler();
+
+    @Override
+    public void handle(
+        HttpServletRequest request,
+        HttpServletResponse response,
+        Supplier<CsrfToken> deferredCsrfToken
+    ) {
+        xor.handle(request, response, deferredCsrfToken);
+    }
+
+    @Override
+    public String resolveCsrfTokenValue(
+        HttpServletRequest request,
+        CsrfToken csrfToken
+    ) {
+        if (StringUtils.hasText(request.getHeader(csrfToken.getHeaderName()))) {
+            return plain.resolveCsrfTokenValue(request, csrfToken);
+        }
+        return xor.resolveCsrfTokenValue(request, csrfToken);
+    }
+}
@@ -0,0 +1,80 @@
+server:
+  port: ${SERVER_PORT:8083}
+  servlet:
+    session:
+      cookie:
+        name: AP3_SESSION
+        http-only: true
+        same-site: lax
+
+spring:
+  application:
+    name: keycloak-bff
+  datasource:
+    # B-2: authorized client 전용. Keycloak 과 같은 PostgreSQL 인스턴스지만
+    # 테이블이 다르다(oauth2_authorized_client). 운영이라면 분리를 검토한다.
+    url: ${BFF_DB_URL:jdbc:postgresql://localhost:5432/keycloak}
+    username: ${BFF_DB_USER:keycloak}
+    password: ${BFF_DB_PASSWORD:keycloak}
+  sql:
+    init:
+      # Spring Security 가 제공하는 DDL 을 그대로 쓴다.
+      # always 로 두면 매 기동마다 실행되므로 CREATE TABLE IF NOT EXISTS 가 아닌
+      # 스크립트에서는 실패한다 → continue-on-error 로 넘긴다.
+      mode: ${SPRING_SQL_INIT_MODE:always}
+      # ★ PostgreSQL 은 -postgres 판본을 써야 한다. 기본 판본은 `blob` 타입을
+      #   쓰는데 PostgreSQL 에는 그 타입이 없다(`bytea` 다). continue-on-error 가
+      #   그 실패를 삼켜서 "테이블이 조용히 안 생기는" 상태가 됐었다.
+      schema-locations: classpath:org/springframework/security/oauth2/client/oauth2-client-schema-postgres.sql
+      continue-on-error: true
+  data:
+    redis:
+      host: ${REDIS_HOST:localhost}
+      port: ${REDIS_PORT:6379}
+  session:
+    # Application Session 만 Redis 로 간다. OAuth2AuthorizedClient 는
+    # 이 설정과 무관하며 여전히 InMemory 다 — 조회 키가 다르기 때문이다(B-0).
+    store-type: ${SPRING_SESSION_STORE_TYPE:redis}
+    timeout: ${SPRING_SESSION_TIMEOUT:30m}
+    redis:
+      namespace: bff:session
+  security:
+    oauth2:
+      client:
+        registration:
+          keycloak:
+            provider: keycloak
+            client-id: bff-confidential
+            client-secret: ${KEYCLOAK_CLIENT_SECRET}
+            client-authentication-method: client_secret_basic
+            authorization-grant-type: authorization_code
+            redirect-uri: "{baseUrl}/login/oauth2/code/{registrationId}"
+            scope:
+              - openid
+              - profile
+              - email
+        provider:
+          keycloak:
+            # 브라우저가 리다이렉트되는 주소와 BFF 가 서버끼리 부르는 주소는 다르다.
+            # 앞의 것은 외부에서 닿는 이름이어야 하고, 뒤의 것은 클러스터 안 주소여도 된다.
+            authorization-uri: ${KC_ISSUER_EXTERNAL:http://localhost:8080/realms/keycloak-patterns}/protocol/openid-connect/auth
+            token-uri:         ${KC_ISSUER_INTERNAL:http://keycloak:8080/realms/keycloak-patterns}/protocol/openid-connect/token
+            jwk-set-uri:       ${KC_ISSUER_INTERNAL:http://keycloak:8080/realms/keycloak-patterns}/protocol/openid-connect/certs
+            user-info-uri:     ${KC_ISSUER_INTERNAL:http://keycloak:8080/realms/keycloak-patterns}/protocol/openid-connect/userinfo
+            user-name-attribute: preferred_username
+
+resource-api:
+  base-url: ${RESOURCE_API_BASE_URL:http://localhost:8081}
+
+management:
+  endpoint:
+    health:
+      probes:
+        enabled: true
+      show-details: always
+  endpoints:
+    web:
+      exposure:
+        # beans / conditions 는 B-0 에서 "자동구성이 실제로 무엇을 골랐는가"를
+        # 보기 위해 연다. 운영에 그대로 두면 내부 구조가 노출된다.
+        include: health,info,beans,conditions,env
@@ -0,0 +1,59 @@
+const result = document.querySelector("#result");
+
+function render(value) {
+  result.textContent = JSON.stringify(value, null, 2);
+}
+
+function readCookie(name) {
+  const prefix = `${encodeURIComponent(name)}=`;
+  const value = document.cookie
+    .split("; ")
+    .find((cookie) => cookie.startsWith(prefix));
+  return value ? decodeURIComponent(value.slice(prefix.length)) : null;
+}
+
+async function request(path, options = {}) {
+  const response = await fetch(path, {
+    ...options,
+    headers: { Accept: "application/json", ...options.headers },
+  });
+  if (response.redirected || response.status === 401) {
+    window.location.assign("/oauth2/authorization/keycloak");
+    return null;
+  }
+  const body = await response.json();
+  render({ status: response.status, ...body });
+  return { response, body };
+}
+
+document.querySelector("#login").addEventListener("click", () => {
+  window.location.assign("/oauth2/authorization/keycloak");
+});
+
+document.querySelector("#inspect").addEventListener("click", () => {
+  void request("/bff/token-boundary");
+});
+
+document.querySelector("#call-bff").addEventListener("click", () => {
+  void request("/bff/api/me");
+});
+
+document.querySelector("#change-with-csrf").addEventListener("click", async () => {
+  const csrfResponse = await fetch("/bff/csrf", {
+    headers: { Accept: "application/json" },
+  });
+  const csrf = await csrfResponse.json();
+  const csrfToken = readCookie("XSRF-TOKEN");
+  if (!csrfToken) {
+    render({ status: 500, error: "XSRF-TOKEN cookie was not created" });
+    return;
+  }
+  await request("/bff/api/preferences", {
+    method: "POST",
+    body: new URLSearchParams({ theme: "dark" }),
+    headers: {
+      "Content-Type": "application/x-www-form-urlencoded",
+      [csrf.headerName]: csrfToken,
+    },
+  });
+});
@@ -0,0 +1,31 @@
+<!doctype html>
+<html lang="ko">
+<head>
+  <meta charset="utf-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1">
+  <title>AP3 · Backend-for-Frontend</title>
+  <style>
+    :root { color-scheme: light dark; font-family: system-ui, sans-serif; }
+    body { max-width: 58rem; margin: 6vh auto; padding: 0 1.5rem; line-height: 1.6; }
+    button { margin: 0 0.5rem 0.5rem 0; padding: 0.6rem 0.9rem; cursor: pointer; }
+    pre { min-height: 9rem; padding: 1rem; border-radius: 0.4rem;
+      background: color-mix(in srgb, CanvasText 9%, Canvas); white-space: pre-wrap; }
+  </style>
+</head>
+<body>
+  <main>
+    <h1>AP3 · Backend-for-Frontend</h1>
+    <p>
+      브라우저에는 OAuth token이 전혀 전달되지 않습니다. HttpOnly session
+      cookie로 BFF만 호출하고, BFF가 서버 보관 access token을 Resource
+      Server 요청에 붙입니다.
+    </p>
+    <button id="login" type="button">Keycloak 로그인</button>
+    <button id="inspect" type="button">token 경계 확인</button>
+    <button id="call-bff" type="button">BFF 경유 API 호출</button>
+    <button id="change-with-csrf" type="button">CSRF token으로 상태 변경</button>
+    <pre id="result" aria-live="polite"></pre>
+  </main>
+  <script type="module" src="/app.js"></script>
+</body>
+</html>
@@ -0,0 +1,99 @@
+package com.example.keycloakpattern.bff;
+
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.when;
+import static org.springframework.security.test.web.servlet.request.SecurityMockMvcRequestPostProcessors.oidcLogin;
+import static org.springframework.security.test.web.servlet.request.SecurityMockMvcRequestPostProcessors.csrf;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.post;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.header;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.jsonPath;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.security.oauth2.client.OAuth2AuthorizedClient;
+import org.springframework.security.oauth2.client.OAuth2AuthorizedClientManager;
+import org.springframework.security.oauth2.client.OAuth2AuthorizedClientService;
+import org.springframework.security.oauth2.core.OAuth2AccessToken;
+import org.springframework.security.oauth2.core.OAuth2RefreshToken;
+import org.springframework.test.context.bean.override.mockito.MockitoBean;
+import org.springframework.test.web.servlet.MockMvc;
+
+@SpringBootTest(properties = {
+    "KEYCLOAK_CLIENT_SECRET=test-only-secret",
+    // 테스트는 Redis 를 띄우지 않는다. store-type=none 이면 자동구성이
+    // 서블릿 컨테이너 기본 세션으로 되돌아가 컨텍스트가 뜬다.
+    "spring.session.store-type=none",
+    // 테스트에는 PostgreSQL 이 없다. H2 로 대신하고 Spring Security 의
+    // DDL 을 그대로 태워 JdbcOAuth2AuthorizedClientService 가 뜨게 한다.
+    "spring.datasource.url=jdbc:h2:mem:bfftest;DB_CLOSE_DELAY=-1",
+    "spring.datasource.username=sa",
+    "spring.datasource.password=",
+    "spring.sql.init.mode=always",
+    "resource-api.base-url=http://127.0.0.1:9"
+})
+@AutoConfigureMockMvc
+class BffControllerTest {
+
+    @Autowired
+    private MockMvc mockMvc;
+
+    @MockitoBean
+    private OAuth2AuthorizedClientService authorizedClientService;
+
+    @MockitoBean
+    private OAuth2AuthorizedClientManager authorizedClientManager;
+
+    @Test
+    void reportsServerTokenCustodyWithoutReturningTokens() throws Exception {
+        OAuth2AuthorizedClient client = mock(OAuth2AuthorizedClient.class);
+        when(client.getAccessToken()).thenReturn(mock(OAuth2AccessToken.class));
+        when(client.getRefreshToken()).thenReturn(mock(OAuth2RefreshToken.class));
+        when(authorizedClientService.loadAuthorizedClient("keycloak", "test-subject"))
+            .thenReturn(client);
+
+        mockMvc.perform(get("/bff/token-boundary").with(oidcLogin()
+                .idToken(token -> token.subject("test-subject"))))
+            .andExpect(status().isOk())
+            .andExpect(header().string("Cache-Control", "no-store"))
+            .andExpect(jsonPath("$.accessTokenStoredOnServer").value(true))
+            .andExpect(jsonPath("$.refreshTokenStoredOnServer").value(true))
+            .andExpect(jsonPath("$.browserTokenCount").value(0))
+            .andExpect(jsonPath("$.csrfProtectionEnabled").value(true))
+            .andExpect(jsonPath("$.access_token").doesNotExist())
+            .andExpect(jsonPath("$.refresh_token").doesNotExist());
+    }
+
+    @Test
+    void rejectsStateChangeWithoutCsrfToken() throws Exception {
+        mockMvc.perform(post("/bff/api/preferences")
+                .param("theme", "attacker")
+                .with(oidcLogin().idToken(token -> token.subject("test-subject"))))
+            .andExpect(status().isForbidden());
+    }
+
+    @Test
+    void acceptsStateChangeWithCsrfToken() throws Exception {
+        mockMvc.perform(post("/bff/api/preferences")
+                .param("theme", "dark")
+                .with(oidcLogin().idToken(token -> token.subject("test-subject")))
+                .with(csrf()))
+            .andExpect(status().isOk())
+            .andExpect(jsonPath("$.updated").value(true))
+            .andExpect(jsonPath("$.theme").value("dark"));
+    }
+
+    @Test
+    void exposesSpaCsrfTokenWithoutCaching() throws Exception {
+        mockMvc.perform(get("/bff/csrf").with(oidcLogin()
+                .idToken(token -> token.subject("test-subject"))))
+            .andExpect(status().isOk())
+            .andExpect(header().string("Cache-Control", "no-store"))
+            .andExpect(header().exists("Set-Cookie"))
+            .andExpect(jsonPath("$.headerName").value("X-XSRF-TOKEN"))
+            .andExpect(jsonPath("$.token").isNotEmpty());
+    }
+}
@@ -0,0 +1,128 @@
+# Experiment B-7 — oauth2-proxy, to measure how replicas share a cookie secret
+# and what happens when it is rotated (Q1, unknown 7).
+#
+# This is a different shape of problem from the BFF. The BFF keeps state on the
+# server, so the question was "which store". oauth2-proxy keeps no server state
+# at all: the whole session rides in a cookie that is signed and encrypted with
+# --cookie-secret. So there is nothing to share and nothing to lose on restart —
+# instead, every replica must hold the *same* secret, and changing it invalidates
+# every cookie at once.
+#
+#   kubectl apply -f deploy/lab/k8s/b7-oauth2-proxy.yaml
+#
+# app2.hyeonworks.com is borrowed from Grafana for the duration of this
+# experiment; the certificate only covers auth / app1 / app2, so a fourth name
+# is not available. Grafana's Ingress is restored afterwards.
+apiVersion: v1
+kind: Secret
+metadata:
+  name: oauth2-proxy-secrets
+  namespace: keycloak-lab
+type: Opaque
+stringData:
+  # oauth2-proxy requires exactly 16, 24 or 32 bytes. This is the value whose
+  # rotation the experiment is about.
+  COOKIE_SECRET_A: "lab-cookie-secret-aaaaaaaaaaaaaa"
+  COOKIE_SECRET_B: "lab-cookie-secret-bbbbbbbbbbbbbb"
+  CLIENT_SECRET: proxy-lab-secret
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: oauth2-proxy
+  namespace: keycloak-lab
+spec:
+  # Two replicas is the point: Q1 asks how they share the secret.
+  replicas: 2
+  selector:
+    matchLabels: { app: oauth2-proxy }
+  template:
+    metadata:
+      labels: { app: oauth2-proxy }
+    spec:
+      # See B-1: Kubernetes injects <SVCNAME>_PORT as a tcp:// URL and it
+      # collides with ordinary configuration names.
+      enableServiceLinks: false
+      topologySpreadConstraints:
+        - maxSkew: 1
+          topologyKey: kubernetes.io/hostname
+          whenUnsatisfiable: ScheduleAnyway
+          labelSelector:
+            matchLabels: { app: oauth2-proxy }
+      containers:
+        - name: oauth2-proxy
+          image: quay.io/oauth2-proxy/oauth2-proxy:v7.7.1
+          args:
+            - --provider=oidc
+            - --oidc-issuer-url=https://auth.hyeonworks.com/realms/keycloak-patterns
+            - --client-id=oauth2-proxy
+            - --redirect-url=https://app2.hyeonworks.com/oauth2/callback
+            - --email-domain=*
+            - --http-address=0.0.0.0:4180
+            # The upstream is the same echo app the B-4 header experiment used,
+            # so what the proxy forwards can be read straight off the response.
+            - --upstream=http://echo.header-lab.svc:8081
+            # ★ 이 옵션을 켜면 세션(=쿠키)에 access token 이 들어간다.
+            # 그러면 Set-Cookie 가 커져 프록시 앞단에서 502 가 났다.
+            # B-4 에서 본 헤더 크기 절벽이 이번에는 응답 쪽에서 나타난 것이다.
+            # - --pass-authorization-header=true
+            - --set-xauthrequest=true
+            - --reverse-proxy=true
+            - --cookie-secure=true
+            # One hour, matching the value Q1 records for the current setup.
+            - --cookie-expire=1h
+            - --skip-provider-button=true
+            # ★ 쿠키에 세션 전체를 담으면 Set-Cookie 가 커지고, 그 응답이
+            # 앞단 nginx 의 proxy_buffer 를 넘겨 502 가 났다(측정됨).
+            # Redis 로 옮기면 쿠키에는 티켓만 남는다 — 그리고 그 순간
+            # "replica 가 secret 을 공유해야 한다"는 문제의 성격도 바뀐다.
+            - --session-store-type=redis
+            - --redis-connection-url=redis://redis.keycloak-lab.svc:6379
+          env:
+            - name: OAUTH2_PROXY_CLIENT_SECRET
+              valueFrom:
+                secretKeyRef: { name: oauth2-proxy-secrets, key: CLIENT_SECRET }
+            # Which of the two secrets is in use is switched here. Both replicas
+            # read the same key, which is exactly the sharing Q1 asks about.
+            - name: OAUTH2_PROXY_COOKIE_SECRET
+              valueFrom:
+                secretKeyRef: { name: oauth2-proxy-secrets, key: COOKIE_SECRET_A }
+          ports:
+            - containerPort: 4180
+              name: http
+          readinessProbe:
+            httpGet: { path: /ping, port: http }
+            initialDelaySeconds: 5
+          resources:
+            requests: { memory: 32Mi, cpu: 20m }
+            limits:   { memory: 128Mi }
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: oauth2-proxy
+  namespace: keycloak-lab
+spec:
+  selector: { app: oauth2-proxy }
+  ports:
+    - port: 4180
+      targetPort: http
+---
+apiVersion: networking.k8s.io/v1
+kind: Ingress
+metadata:
+  name: oauth2-proxy
+  namespace: keycloak-lab
+spec:
+  ingressClassName: traefik
+  rules:
+    - host: app2.hyeonworks.com
+      http:
+        paths:
+          - path: /
+            pathType: Prefix
+            backend:
+              service:
+                name: oauth2-proxy
+                port:
+                  number: 4180
@@ -0,0 +1,214 @@
+# BFF (2 replicas) + Redis, for the B-layer experiments.
+#
+# The BFF is deployed FIRST WITHOUT any session store wiring. That is deliberate:
+# B-0 asks what Spring Boot's autoconfiguration actually picks when nothing is
+# configured, and the only honest way to answer is to look at a running instance
+# that has been given nothing. Redis is deployed alongside but left unused until
+# B-1 turns it on.
+#
+#   kubectl apply -f deploy/lab/k8s/bff-redis.yaml
+#
+# Image comes from the workstation, not a registry:
+#   docker build -t keycloak-pattern-bff:lab bff/
+#   docker save keycloak-pattern-bff:lab | ssh test-server "ssh kc-lab-1 'sudo k3s ctr images import -'"
+#   (repeat for kc-lab-2)
+# so imagePullPolicy must stay Never on both replicas.
+apiVersion: v1
+kind: Secret
+metadata:
+  name: bff-secrets
+  namespace: keycloak-lab
+type: Opaque
+stringData:
+  # Matches the client created with kcadm in the keycloak-patterns realm.
+  # Base64 in etcd is not encryption — see D-3.
+  KEYCLOAK_CLIENT_SECRET: bff-lab-secret
+---
+# Redis. B-5 measured that turning on AOF with `redis-cli config set` changes
+# nothing here, because /data is the container filesystem and dies with the
+# container — the appendonlydir was created and then thrown away. Persistence
+# configuration without a volume is decoration.
+#
+# So the volume comes first, and only then does `--appendonly yes` mean anything.
+apiVersion: v1
+kind: PersistentVolumeClaim
+metadata:
+  name: redis-data
+  namespace: keycloak-lab
+spec:
+  accessModes: [ReadWriteOnce]
+  storageClassName: local-path
+  resources:
+    requests:
+      storage: 1Gi
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: redis
+  namespace: keycloak-lab
+spec:
+  replicas: 1
+  selector:
+    matchLabels: { app: redis }
+  template:
+    metadata:
+      labels: { app: redis }
+    spec:
+      # Same node as postgres so a node-loss experiment takes both stores at
+      # once, matching how A-4 was set up.
+      nodeSelector:
+        kubernetes.io/hostname: kc-lab-2
+      containers:
+        - name: redis
+          image: redis:7.4-alpine
+          # appendfsync everysec 이 기본값이다 — 1초 분량을 잃을 수 있다.
+          # Keycloak 의 synchronous_commit OFF(A-3)와 같은 모양의 트레이드오프다.
+          args: ["redis-server", "--appendonly", "yes", "--dir", "/data"]
+          ports:
+            - containerPort: 6379
+              name: redis
+          readinessProbe:
+            exec: { command: ["redis-cli", "ping"] }
+            initialDelaySeconds: 3
+          volumeMounts:
+            - name: data
+              mountPath: /data
+          resources:
+            requests: { memory: 32Mi, cpu: 20m }
+            limits:   { memory: 128Mi }
+      volumes:
+        - name: data
+          persistentVolumeClaim:
+            claimName: redis-data
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: redis
+  namespace: keycloak-lab
+spec:
+  selector: { app: redis }
+  ports:
+    - port: 6379
+      targetPort: redis
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: bff
+  namespace: keycloak-lab
+spec:
+  # Two replicas is the whole point: Q1 and Q2 only exist because a request can
+  # land on an instance that did not handle the login.
+  replicas: 2
+  selector:
+    matchLabels: { app: bff }
+  template:
+    metadata:
+      labels: { app: bff }
+    spec:
+      # Spread across both nodes so "the other instance" is genuinely another
+      # machine, not another process on the same kernel.
+      topologySpreadConstraints:
+        - maxSkew: 1
+          topologyKey: kubernetes.io/hostname
+          whenUnsatisfiable: ScheduleAnyway
+          labelSelector:
+            matchLabels: { app: bff }
+      # 쿠버네티스는 같은 네임스페이스의 Service 마다 Docker link 시절의
+      # 환경변수를 자동 주입한다: REDIS_PORT=tcp://10.43.57.116:6379.
+      # 그것이 application.yml 의 ${REDIS_PORT:6379} 를 덮어써서 기동이 실패했다.
+      #   Failed to bind properties under 'spring.data.redis.port' to int:
+      #     Value: "tcp://10.43.57.116:6379"
+      # 이 주입 자체를 끄는 것이 근본 처방이다. 이름을 바꿔 피하면 다음 사람이
+      # 같은 함정에 다시 빠진다.
+      enableServiceLinks: false
+      containers:
+        - name: bff
+          image: keycloak-pattern-bff:lab
+          imagePullPolicy: Never
+          ports:
+            - containerPort: 8083
+              name: http
+          env:
+            # The browser is redirected to the public name; the BFF calls the
+            # token endpoint over the cluster network. Getting these two the same
+            # way round is what the 2-hop header experiment was about.
+            - name: KC_ISSUER_EXTERNAL
+              value: https://auth.hyeonworks.com/realms/keycloak-patterns
+            - name: KC_ISSUER_INTERNAL
+              value: http://keycloak.keycloak-lab.svc:8080/realms/keycloak-patterns
+            # echo 는 header-lab 네임스페이스의 8081 이다. 다른 네임스페이스의
+            # 서비스는 <svc>.<ns>.svc 로 부른다. 이름을 틀리면 500 이 나는데
+            # 원인은 UnresolvedAddressException 이지 토큰 문제가 아니다.
+            - name: RESOURCE_API_BASE_URL
+              value: http://echo.header-lab.svc:8081
+            - name: KEYCLOAK_CLIENT_SECRET
+              valueFrom:
+                secretKeyRef: { name: bff-secrets, key: KEYCLOAK_CLIENT_SECRET }
+            # Spring needs to know it is behind TLS termination, for the same
+            # reason Keycloak needs KC_PROXY_HEADERS. Without it the redirect_uri
+            # it builds comes back as http:// and Keycloak rejects it.
+            - name: SERVER_FORWARD_HEADERS_STRATEGY
+              value: native
+            # B-1: Application Session 을 Redis 로 옮긴다.
+            # OAuth2AuthorizedClient 는 이것으로 옮겨지지 않는다 — 조회 키가
+            # 다르기 때문이며, B-0 에서 확인한 사실이다.
+            - name: SPRING_SESSION_STORE_TYPE
+              value: redis
+            - name: REDIS_HOST
+              value: redis.keycloak-lab.svc
+            - name: REDIS_PORT
+              value: "6379"
+            # B-2: authorized client 는 PostgreSQL 로. 세션(Redis)과 다른
+            # 저장소를 쓰는 것이 Q3 가 말한 "각각 설계한다"의 실물이다.
+            - name: BFF_DB_URL
+              value: jdbc:postgresql://postgres.keycloak-lab.svc:5432/keycloak
+            - name: BFF_DB_USER
+              value: keycloak
+            - name: BFF_DB_PASSWORD
+              valueFrom:
+                secretKeyRef: { name: keycloak-lab-secrets, key: POSTGRES_PASSWORD }
+            - name: JAVA_TOOL_OPTIONS
+              value: "-Xms128m -Xmx320m"
+          readinessProbe:
+            httpGet: { path: /actuator/health/readiness, port: http }
+            initialDelaySeconds: 20
+            failureThreshold: 30
+          livenessProbe:
+            httpGet: { path: /actuator/health/liveness, port: http }
+            initialDelaySeconds: 60
+          resources:
+            requests: { memory: 320Mi, cpu: 100m }
+            limits:   { memory: 512Mi }
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: bff
+  namespace: keycloak-lab
+spec:
+  selector: { app: bff }
+  ports:
+    - port: 8083
+      targetPort: http
+---
+apiVersion: networking.k8s.io/v1
+kind: Ingress
+metadata:
+  name: bff
+  namespace: keycloak-lab
+spec:
+  ingressClassName: traefik
+  rules:
+    - host: app1.hyeonworks.com
+      http:
+        paths:
+          - path: /
+            pathType: Prefix
+            backend:
+              service:
+                name: bff
+                port:
+                  number: 8083
@@ -0,0 +1,18 @@
+=== 비교를 위해 세션을 비운다 ===
+DELETE 151
+
+=== volatile 모드로 전환 ===
+namespace/keycloak-lab unchanged
+secret/keycloak-lab-secrets configured
+persistentvolumeclaim/postgres-data unchanged
+deployment.apps/postgres unchanged
+service/postgres unchanged
+statefulset.apps/keycloak configured
+service/keycloak-headless unchanged
+service/keycloak unchanged
+ingress.networking.k8s.io/keycloak unchanged
+Waiting for 1 pods to be ready...
+partitioned roll out complete: 2 new pods have been updated...
+
+=== [검증] 정말 꺼졌는가 ===
+["start","--features-disabled=persistent-user-sessions"]
@@ -0,0 +1,15 @@
+  keycloak-0=10.42.1.94  keycloak-1=10.42.0.45
+
+=== [A-0 재실행] keycloak-0 에만 로그인 5회 → 캐시가 어디에 담기는가 ===
+로그인완료
+  keycloak-0  sessions 캐시 5.0 건
+  keycloak-1  sessions 캐시 0.0 건
+
+=== DB 에는 들어갔는가 (persistent 였을 때는 5건이 들어갔다) ===
+ offline_flag | count 
+--------------+-------
+(0 rows)
+
+
+=== 교차 노드 세션은 되는가 ===
+  keycloak-0 로그인 → keycloak-1 에서 refresh  HTTP 200
@@ -0,0 +1,13 @@
+=== [A-8 재실행] 재시작 전 로그인 ===
+  sid = aVwYnzKZFFvMqD3bpSeiILuM
+
+=== 롤링 재시작 ===
+statefulset.apps/keycloak restarted
+partitioned roll out complete: 2 new pods have been updated...
+
+=== ★ 재시작 전 토큰이 아직 통하는가 (persistent 였을 때는 200) ===
+  keycloak-0 에서 refresh  HTTP 400
+  --- 오류 본문 ---
+{"error":"invalid_grant","error_description":"Session not active"}
+=== 캐시 상태 ===
+  keycloak-1  sessions 캐시 1.0 건
@@ -0,0 +1,21 @@
+=== [A-1 재실행] volatile 에서 7800 을 막으면 ===
+  keycloak-0=10.42.1.99  keycloak-1=10.42.0.46
+  [대조군] 차단 전 교차 노드 refresh
+    keycloak-1 에서 refresh  HTTP 200
+
+  차단 적용 (A-5 에서 확인한 raw 테이블 방식, 양방향)
+  분단이 성립할 때까지 대기...
+    +25초  cluster_size(k0 k1) = [2.0 2.0 ]
+    +50초  cluster_size(k0 k1) = [1.0 ]
+    +75초  cluster_size(k0 k1) = [1.0 ]
+    +100초  cluster_size(k0 k1) = []
+    +125초  cluster_size(k0 k1) = [1.0 ]
+    +150초  cluster_size(k0 k1) = [1.0 ]
+    +175초  cluster_size(k0 k1) = [1.0 ]
+    +200초  cluster_size(k0 k1) = []
+
+=== ★ 분단 상태에서 교차 노드 세션 (persistent 였을 때는 200) ===
+  keycloak-0 로그인 → keycloak-0 에서 refresh  HTTP 200  ← 대조군
+  keycloak-0 로그인 → keycloak-1 에서 refresh  HTTP 400  ← 시험군
+  --- 시험군 오류 본문 ---
+{"error":"invalid_grant","error_description":"Session not active"}
@@ -0,0 +1,12 @@
+차단 해제, 클러스터 재형성 대기...
+
+=== [A-2 재실행] volatile 에서 DB 를 내리면 — 세션이 메모리에 있으니 살아남는가? ===
+  DB 정지 전 로그인 완료
+deployment.apps/postgres scaled
+  postgres 정지
+  ① 캐시를 가진 노드에서 refresh  HTTP 500
+  ② 새 로그인                     HTTP 200
+
+=== DB 복구 후 원복 ===
+deployment.apps/postgres scaled
+deployment "postgres" successfully rolled out
@@ -0,0 +1,12 @@
+=== persistent 모드로 원복 ===
+statefulset.apps/keycloak configured
+partitioned roll out complete: 2 new pods have been updated...
+
+=== [검증] persistent 로 돌아왔는가 — 로그인 후 DB 에 행이 생기는가 ===
+["start"]
+로그인
+  DB 온라인 세션: 1 건  (1 이면 persistent 복귀)
+keycloak-0                  1/1   Running   0     67s
+keycloak-1                  1/1   Running   0     89s
+postgres-7b474b88c8-t6rrf   1/1   Running   0     2m8s
+  외부 진입점 HTTP 200
@@ -0,0 +1,23 @@
+# A-7 — volatile 모드 비교 증거
+
+2026-09-04 13:45–14:15 KST
+해설: [`docs/experiment-a7-volatile-comparison.md`](../../experiment-a7-volatile-comparison.md)
+
+| 파일 | 무엇을 보여주는가 |
+|---|---|
+| `01-switch-to-volatile.txt` | `--features-disabled=persistent-user-sessions` 적용, args 확인 |
+| `02-a0-rerun.txt` | **DB 0건**인데 교차 노드 refresh `200` — 경로가 DB 에서 클러스터로 바뀌었다 |
+| `03-a8-rerun-restart.txt` | **롤링 재시작 후 `400 Session not active`** — persistent 에서는 `200` 이었다 |
+| `04-a1-rerun-partition.txt` | **7800 차단 시 교차 노드 `400`** — persistent 에서는 `200`. 대조군(같은 노드)은 `200` 유지 |
+| `05-a2-rerun-db-loss.txt` | DB 정지 중 **새 로그인 `200`**(persistent 에서는 500), refresh 는 `500` |
+| `06-restore-persistent.txt` | 원복 확인 — `args: ["start"]`, 로그인 후 DB 1건, 외부 200 |
+
+## 뒤집힌 결과
+
+| 실험 | persistent | volatile |
+|---|---|---|
+| A-1 7800 차단 후 교차 refresh | `200` | **`400`** |
+| A-8 롤링 재시작 후 refresh | `200` | **`400`** |
+| A-2 DB 정지 중 새 로그인 | `500` | **`200`** |
+
+**같은 주입, 같은 관측, 정반대 결과.** A층 전체가 버전 조건부임을 보여주는 대조군이다.
@@ -0,0 +1,17 @@
+=== [1] 재시작 전 로그인 — 토큰을 파드 안에 보관 ===
+  sid = XLcgQWRiJrTkuNZcJsNeT_2j
+  DB 세션 수: 151
+
+=== [2] 롤링 재시작 중 가용성 — 5초 간격으로 외부 진입점 확인 ===
+statefulset.apps/keycloak restarted
+200 Waiting for partitioned roll out to finish: 0 out of 2 new pods have been updated...
+Waiting for 1 pods to be ready...
+Waiting for 1 pods to be ready...
+Waiting for 1 pods to be ready...
+200 200 200 200 Waiting for partitioned roll out to finish: 1 out of 2 new pods have been updated...
+Waiting for 1 pods to be ready...
+Waiting for 1 pods to be ready...
+Waiting for 1 pods to be ready...
+200 200 200 200 partitioned roll out complete: 2 new pods have been updated...
+
+  (위 숫자열이 재시작 중 외부 응답 코드의 시계열)
@@ -0,0 +1,19 @@
+=== [3] 재시작 전 발급한 refresh token 이 아직 통하는가 ===
+  대상 sid: XLcgQWRiJrTkuNZcJsNeT_2j
+  keycloak-0 에서 refresh  HTTP 200
+
+=== [4] DB 에 그 세션이 남아 있는가 ===
+     user_session_id      | created_on | last_session_refresh 
+--------------------------+------------+----------------------
+ XLcgQWRiJrTkuNZcJsNeT_2j | 1788495513 |           1788495577
+(1 row)
+
+  전체 온라인 세션: 151 (재시작 전 151)
+
+=== [5] 캐시는 어떻게 되었는가 ===
+  keycloak-0  sessions 캐시 0.0 건 / cluster_size 2.0
+  keycloak-1  sessions 캐시 1.0 건 / cluster_size 2.0
+
+=== [6] 파드 나이 — 정말 재시작되었나 ===
+keycloak-0                  1/1   Running   0     44s
+keycloak-1                  1/1   Running   0     66s
@@ -0,0 +1,16 @@
+# A-8 — 롤링 재시작 증거
+
+2026-09-04 13:38–13:41 KST
+해설: [`docs/experiment-a8-rolling-restart.md`](../../experiment-a8-rolling-restart.md)
+
+| 파일 | 무엇을 보여주는가 |
+|---|---|
+| `01-restart-availability.txt` | 재시작 전 로그인(sid 기록), 롤링 재시작 중 외부 진입점 **9회 모두 `200`** |
+| `02-session-survival.txt` | 재시작 전 토큰으로 refresh **`200`**, DB 행 생존(`last_session_refresh` 갱신 확인), **세션 수 151 → 151**, 캐시 0으로 초기화, 파드 나이 44초/66초 |
+| `a8-cache-reset-cluster-reformed.png` | Grafana — 세션 캐시가 0 으로 떨어지고 `cluster_size` 가 다시 2 가 되는 구간 |
+
+## 핵심 세 줄
+
+1. **무중단이었다.** 한 번에 하나씩 내리고 readiness 가 전환을 맞춰준다 — replica ≥ 2 가 전제.
+2. **세션은 살아남고 캐시만 사라진다.** DB 151건 그대로, 재시작 전 토큰이 그대로 통한다.
+3. **이것이 `persistent-user-sessions` 를 켜는 진짜 이유다.** A-7(volatile)에서 정반대가 나와야 한다.
@@ -0,0 +1,21 @@
+=== 배포 전 자원 ===
+Mem:           11648        7329         280           4        4377        4319
+NAME       CPU(cores)   CPU(%)   MEMORY(bytes)   MEMORY(%)   
+kc-lab-1   115m         5%       2192Mi          44%         
+kc-lab-2   121m         6%       1324Mi          33%         
+
+=== 배포 ===
+secret/bff-secrets created
+deployment.apps/redis created
+service/redis created
+deployment.apps/bff created
+service/bff created
+ingress.networking.k8s.io/bff created
+
+deployment "redis" successfully rolled out
+Waiting for deployment "bff" rollout to finish: 1 of 2 updated replicas are available...
+deployment "bff" successfully rolled out
+
+bff-574c6d658b-8cz4x        true   kc-lab-1
+bff-574c6d658b-zpkbp        true   kc-lab-2
+redis-568bd7c4-5c5vc        true   kc-lab-2
@@ -0,0 +1,13 @@
+=== B-0: 자동구성이 실제로 고른 구현체 ===
+  Q1 확인한 사실: "코드에 저장소를 직접 생성하는 Bean 이 없기 때문에,
+   어떤 구현체가 실제로 사용되는지는 자동구성 결과까지 확인해야 정확하게 알 수 있다"
+
+  File "<stdin>", line 9
+    print(f"    {name:46} {t.rsplit(\".\",1)[-1]}")
+                                     ^
+SyntaxError: unexpected character after line continuation character
+
+=== HttpSession 은 어디에 있는가 (서블릿 컨테이너 기본) ===
+
+=== 외부 진입점 ===
+  https://app1.hyeonworks.com/  HTTP 200
@@ -0,0 +1,29 @@
+=== B-0 — 자동구성이 실제로 고른 구현체 ===
+  컨텍스트: keycloak-bff
+  전체 빈 수: 321
+
+  --- 세션 · 토큰 저장소 관련 ---
+    authorizedClientManager                        -> AuthorizedClientServiceOAuth2AuthorizedClientManager
+    authorizedClientManagerRegistrar               -> OAuth2ClientConfiguration$OAuth2AuthorizedClientManagerRegistrar
+    authorizedClientRepository                     -> AuthenticatedPrincipalOAuth2AuthorizedClientRepository
+    authorizedClientService                        -> InMemoryOAuth2AuthorizedClientService
+    org.springframework.boot.autoconfigure.security.oauth2.client.OAuth2ClientConfigurations$OAuth2AuthorizedClientServiceConfiguration -> OAuth2ClientConfigurations$OAuth2AuthorizedClientServiceConfiguration
+    org.springframework.security.config.annotation.web.configuration.OAuth2ClientConfiguration$OAuth2AuthorizedClientManagerConfiguration -> OAuth2ClientConfiguration$OAuth2AuthorizedClientManagerConfiguration
+
+  --- OAuth2 클라이언트 관련 전체 ---
+    authorizedClientManager                        -> AuthorizedClientServiceOAuth2AuthorizedClientManager
+    authorizedClientManagerRegistrar               -> OAuth2ClientConfiguration$OAuth2AuthorizedClientManagerRegistrar
+    authorizedClientRepository                     -> AuthenticatedPrincipalOAuth2AuthorizedClientRepository
+    authorizedClientService                        -> InMemoryOAuth2AuthorizedClientService
+    clientRegistrationRepository                   -> InMemoryClientRegistrationRepository
+    org.springframework.boot.autoconfigure.security.oauth2.client.OAuth2ClientAutoConfiguration -> OAuth2ClientAutoConfiguration
+    org.springframework.boot.autoconfigure.security.oauth2.client.OAuth2ClientConfigurations$ClientRegistrationRepositoryConfiguration -> OAuth2ClientConfigurations$ClientRegistrationRepositoryConfiguration
+    org.springframework.boot.autoconfigure.security.oauth2.client.OAuth2ClientConfigurations$OAuth2AuthorizedClientServiceConfiguration -> OAuth2ClientConfigurations$OAuth2AuthorizedClientServiceConfiguration
+    org.springframework.boot.autoconfigure.security.oauth2.client.servlet.OAuth2ClientWebSecurityAutoConfiguration -> OAuth2ClientWebSecurityAutoConfiguration
+    org.springframework.security.config.annotation.web.configuration.OAuth2ClientConfiguration -> OAuth2ClientConfiguration
+    org.springframework.security.config.annotation.web.configuration.OAuth2ClientConfiguration$OAuth2AuthorizedClientManagerConfiguration -> OAuth2ClientConfiguration$OAuth2AuthorizedClientManagerConfiguration
+    org.springframework.security.config.annotation.web.configuration.OAuth2ClientConfiguration$OAuth2ClientWebMvcSecurityConfiguration -> OAuth2ClientConfiguration$OAuth2ClientWebMvcSecurityConfiguration
+    spring.security.oauth2.client-org.springframework.boot.autoconfigure.security.oauth2.client.OAuth2ClientProperties -> OAuth2ClientProperties
+
+  --- Redis / Spring Session 이 구성되었는가 ---
+    ★ 없음 — Redis 도 Spring Session 도 구성되지 않았다
@@ -0,0 +1,18 @@
+# B-0 — BFF·Redis 배포와 자동구성 확인 증거
+
+2026-09-04 14:20–14:50 KST
+해설: [`docs/experiment-b0-bff-redis-deploy.md`](../../experiment-b0-bff-redis-deploy.md)
+
+| 파일 | 무엇을 보여주는가 |
+|---|---|
+| `01-deploy.txt` | 배포 전 자원, Redis·BFF 롤아웃, 두 노드에 하나씩 배치됨 |
+| `02-autoconfiguration.txt` | 첫 조회 시도(파싱 실패)와 **외부 진입점 `HTTP 200`** |
+| `03-beans-analysis.txt` | **B-0 의 답** — `InMemoryOAuth2AuthorizedClientService`, `AuthenticatedPrincipalOAuth2AuthorizedClientRepository`, **Redis·Spring Session 없음** |
+| `b0-bff-login-success-single-replica.png` | replica 1 에서 로그인 성공한 BFF 화면 |
+| `b0-bff-token-boundary.png` | `/bff/token-boundary` — `principal: labuser`, `accessTokenStoredOnServer: true`, **`browserTokenCount: 0`** |
+
+## 핵심 세 줄
+
+1. **`AuthenticatedPrincipalOAuth2AuthorizedClientRepository`** — 조회 키가 principal 이고 session ID 가 없다. Q1·Q3 문제의 기제가 이 빈 하나에 있다.
+2. **Redis 를 붙여도 그건 안 고쳐진다.** 저장소 공유와 조회 키는 다른 문제다.
+3. **replica 2개에서는 로그인 자체가 실패한다.** 인가 코드 흐름의 왕복 두 번이 같은 인스턴스로 가야 하는데, 인가 요청이 인스턴스 메모리에 있다.
@@ -0,0 +1,5 @@
+deployment.apps/bff configured
+deployment "bff" successfully rolled out
+bff-576d869c6d-bshvl   true   kc-lab-2
+bff-695646ddb-kzs9k    true   kc-lab-1
+bff-695646ddb-vjqzf    true   kc-lab-2
@@ -0,0 +1,64 @@
+=== B-1 — Redis 를 붙인 뒤 자동구성이 실제로 바뀌었는가 ===
+  빈 수: 321 → 402  (+81)
+
+  --- 세션 저장소 관련 (새로 생긴 것) ---
+    ★ cookieSerializer                           -> DefaultCookieSerializer
+    ★ org.springframework.boot.autoconfigure.session.RedisSessionConfiguration -> RedisSessionConfiguration
+    ★ org.springframework.boot.autoconfigure.session.RedisSessionConfiguration$DefaultRedisSessionConfiguration -> RedisSessionConfiguration$DefaultRedisSessionConfiguration
+    ★ org.springframework.boot.autoconfigure.session.SessionAutoConfiguration -> SessionAutoConfiguration
+    ★ org.springframework.boot.autoconfigure.session.SessionAutoConfiguration$ServletSessionConfiguration -> SessionAutoConfiguration$ServletSessionConfiguration
+    ★ org.springframework.boot.autoconfigure.session.SessionAutoConfiguration$ServletSessionConfiguration$RememberMeServicesConfiguration -> SessionAutoConfiguration$ServletSessionConfiguration$RememberMeServicesConfiguration
+    ★ org.springframework.boot.autoconfigure.session.SessionAutoConfiguration$ServletSessionConfiguration$ServletSessionRepositoryConfiguration -> SessionAutoConfiguration$ServletSessionConfiguration$ServletSessionRepositoryConfiguration
+    ★ org.springframework.boot.autoconfigure.session.SessionRepositoryFilterConfiguration -> SessionRepositoryFilterConfiguration
+    ★ org.springframework.session.config.annotation.web.http.SpringHttpSessionConfiguration -> SpringHttpSessionConfiguration
+    ★ org.springframework.session.data.redis.config.annotation.web.http.RedisHttpSessionConfiguration -> RedisHttpSessionConfiguration
+    ★ rememberMeServicesCookieSerializerCustomizer -> SessionAutoConfiguration$ServletSessionConfiguration$RememberMeServicesConfiguration$$Lambda/0x00007f364e69fa60
+    ★ sessionEventHttpSessionListenerAdapter     -> SessionEventHttpSessionListenerAdapter
+    ★ sessionRepository                          -> RedisSessionRepository
+    ★ sessionRepositoryFilterRegistration        -> DelegatingFilterProxyRegistrationBean
+    ★ spring.session-org.springframework.boot.autoconfigure.session.SessionProperties -> SessionProperties
+    ★ spring.session.redis-org.springframework.boot.autoconfigure.session.RedisSessionProperties -> RedisSessionProperties
+    ★ springBootSessionRepositoryCustomizer      -> RedisSessionConfiguration$DefaultRedisSessionConfiguration$$Lambda/0x00007f364e6a4a68
+    ★ springSessionRepositoryFilter              -> SessionRepositoryFilter
+
+  --- OAuth2 authorized client — 바뀌었는가? ---
+    authorizedClientService
+      before: InMemoryOAuth2AuthorizedClientService
+      after : InMemoryOAuth2AuthorizedClientService    그대로 — Redis 로 안 옮겨졌다
+    authorizedClientRepository
+      before: AuthenticatedPrincipalOAuth2AuthorizedClientRepository
+      after : AuthenticatedPrincipalOAuth2AuthorizedClientRepository    그대로 — Redis 로 안 옮겨졌다
+    authorizedClientManager
+      before: AuthorizedClientServiceOAuth2AuthorizedClientManager
+      after : AuthorizedClientServiceOAuth2AuthorizedClientManager    그대로 — Redis 로 안 옮겨졌다
+
+  --- Redis 연결 빈 (새로 생긴 것) ---
+    ★ keyValueMappingContext                     -> RedisMappingContext
+    ★ lettuceMetrics                             -> LettuceMetricsAutoConfiguration$$Lambda/0x00007f364e56f4d0
+    ★ org.springframework.boot.actuate.autoconfigure.data.redis.RedisHealthContributorAutoConfiguration -> RedisHealthContributorAutoConfiguration
+    ★ org.springframework.boot.actuate.autoconfigure.data.redis.RedisReactiveHealthContributorAutoConfiguration -> RedisReactiveHealthContributorAutoConfiguration
+    ★ org.springframework.boot.actuate.autoconfigure.metrics.redis.LettuceMetricsAutoConfiguration -> LettuceMetricsAutoConfiguration
+    ★ org.springframework.boot.autoconfigure.data.redis.LettuceConnectionConfiguration -> LettuceConnectionConfiguration
+    ★ org.springframework.boot.autoconfigure.data.redis.RedisAutoConfiguration -> RedisAutoConfiguration
+    ★ org.springframework.boot.autoconfigure.data.redis.RedisReactiveAutoConfiguration -> RedisReactiveAutoConfiguration
+    ★ org.springframework.boot.autoconfigure.data.redis.RedisRepositoriesAutoConfiguration -> RedisRepositoriesAutoConfiguration
+    ★ org.springframework.boot.autoconfigure.session.RedisSessionConfiguration -> RedisSessionConfiguration
+    ★ org.springframework.boot.autoconfigure.session.RedisSessionConfiguration$DefaultRedisSessionConfiguration -> RedisSessionConfiguration$DefaultRedisSessionConfiguration
+    ★ org.springframework.session.data.redis.config.annotation.web.http.RedisHttpSessionConfiguration -> RedisHttpSessionConfiguration
+    ★ reactiveRedisTemplate                      -> ReactiveRedisTemplate
+    ★ reactiveStringRedisTemplate                -> ReactiveStringRedisTemplate
+    ★ redisConnectionDetails                     -> PropertiesRedisConnectionDetails
+    ★ redisConnectionFactory                     -> LettuceConnectionFactory
+    ★ redisConverter                             -> MappingRedisConverter
+    ★ redisCustomConversions                     -> RedisCustomConversions
+    ★ redisHealthContributor                     -> RedisReactiveHealthIndicator
+    ★ redisKeyValueAdapter                       -> RedisKeyValueAdapter
+    ★ redisKeyValueTemplate                      -> RedisKeyValueTemplate
+    ★ redisMappingConfiguration#0                -> MappingConfiguration
+    ★ redisReferenceResolver                     -> ReferenceResolverImpl
+    ★ redisTemplate                              -> RedisTemplate
+    ★ sessionRepository                          -> RedisSessionRepository
+    ★ spring.data.redis-org.springframework.boot.autoconfigure.data.redis.RedisProperties -> RedisProperties
+    ★ spring.session.redis-org.springframework.boot.autoconfigure.session.RedisSessionProperties -> RedisSessionProperties
+    ★ springBootSessionRepositoryCustomizer      -> RedisSessionConfiguration$DefaultRedisSessionConfiguration$$Lambda/0x00007f364e6a4a68
+    ★ stringRedisTemplate                        -> StringRedisTemplate
@@ -0,0 +1,21 @@
+=== Redis 에 무엇이 들어 있는가 ===
+bff:session:sessions:8963b6de-3564-4775-9ccd-1ee9616b83ae
+  총 키 수: 1
+
+=== 세션 키의 내용 — refresh token 이 있는가 (Q3 검증 2번) ===
+  키: bff:session:sessions:8963b6de-3564-4775-9ccd-1ee9616b83ae
+  타입: hash
+    필드: sessionAttr:SPRING_SECURITY_CONTEXT
+    필드: sessionAttr:SPRING_SECURITY_SAVED_REQUEST
+    필드: sessionAttr:SPRING_SECURITY_LAST_EXCEPTION
+    필드: sessionAttr:org.springframework.security.oauth2.client.web.HttpSessionOAuth2AuthorizationRequestRepository.AUTHORIZATION_REQUEST
+    필드: lastAccessedTime
+    필드: maxInactiveInterval
+    필드: creationTime
+
+=== 필드 값에 토큰 문자열이 보이는가 ===
+ 1) "sessionAttr:SPRING_SECURITY_CONTEXT"
+ 2) "\xac\xed\x00\x05sr\x00=org.springframework.security.core.context.SecurityContextImpl\x00\x00\x00\x00\x00\x00\x02l\x02\x00\x01L\x00\x0eauthenticationt\x002Lorg/springframework/security/core/Authentication;xpsr\x00Sorg.springframework.security.oauth2.client.authentication.OAuth2AuthenticationToken\x00\x00\x00\x00\x00\x00\x02l\x02\x00\x02L\x00\x1eauthorizedClientRegistrationIdt\x00\x12Ljava/lang/String;L\x00\tprincipalt\x00:Lorg/springframework/security/oauth2/core/user/OAuth2User;xr\x00Gorg.springframework.security.authentication.AbstractAuthenticationToken\xd3\xaa(~nGd\x0e\x02\x00\x03Z\x00\rauthenticatedL\x00\x0bauthoritiest\x00\x16Ljava/util/Collection;L\x00\adetailst\x00\x12Ljava/lang/Object;xp\x01sr\x00&java.util.Collections$UnmodifiableList\xfc\x0f%1\xb5\xec\x8e\x10\x02\x00\x01L\x00\x04listt\x00\x10Ljava/util/List;xr\x00,java.util.Collect
+
+=== TTL (Q3 검증 3번 — session TTL) ===
+  TTL: 1772 초
@@ -0,0 +1,18 @@
+# B-1 — Redis 세션 저장소 전환 증거
+
+2026-09-04 14:50–15:05 KST
+해설: [`docs/experiment-b1-redis-session-store.md`](../../experiment-b1-redis-session-store.md)
+
+| 파일 | 무엇을 보여주는가 |
+|---|---|
+| `01-servicelinks-trap.txt` | `enableServiceLinks: false` 적용 후 롤아웃 성공 — 쿠버네티스가 주입한 `REDIS_PORT=tcp://...` 가 설정을 덮어쓴 문제 |
+| `02-autoconfig-after.txt` | **핵심** — 빈 321→402(+81). `sessionRepository → RedisSessionRepository` 로 바뀌었지만 **`authorizedClientService` 는 `InMemory` 그대로** |
+| `03-redis-contents.txt` | Redis 키 1개, 필드는 `SPRING_SECURITY_CONTEXT` 뿐. **토큰 없음.** Java 직렬화(`\xac\xed`), TTL 1772초 |
+| `b1-login-works-two-replicas.png` | 전환 직후 `accessTokenStoredOnServer: false` |
+| `b1-token-boundary-after-redis.png` | 파드 전면 교체 후 — `principal: labuser` 는 살아남고 토큰만 사라진 상태 |
+
+## 핵심 세 줄
+
+1. **세션은 옮겨졌고 토큰은 안 옮겨졌다.** 빈 81개가 늘었는데 authorized client 관련은 하나도 안 바뀌었다.
+2. **refresh token 은 Redis 에 평문으로 있는 게 아니라 아예 없다.** 암호화를 고민하기 전에 이걸 알아야 한다.
+3. **"로그인은 되어 있는데 아무것도 못 하는" 상태가 만들어진다** — 완전 로그아웃보다 나쁘다.
@@ -0,0 +1,8 @@
+deployment.apps/bff configured
+deployment "bff" successfully rolled out
+bff-555df79c97-6j86w   1/1   Running       0     44s
+bff-555df79c97-vgg6g   1/1   Running       0     22s
+
+=== oauth2_authorized_client 테이블이 생겼는가 ===
+Did not find any relation named "oauth2_authorized_client".
+command terminated with exit code 1
@@ -0,0 +1,33 @@
+=== PostgreSQL 전용 스키마 ===
+CREATE TABLE oauth2_authorized_client (
+  client_registration_id varchar(100) NOT NULL,
+  principal_name varchar(200) NOT NULL,
+  access_token_type varchar(100) NOT NULL,
+  access_token_value bytea NOT NULL,
+  access_token_issued_at timestamp NOT NULL,
+  access_token_expires_at timestamp NOT NULL,
+  access_token_scopes varchar(1000) DEFAULT NULL,
+  refresh_token_value bytea DEFAULT NULL,
+  refresh_token_issued_at timestamp DEFAULT NULL,
+  created_at timestamp DEFAULT CURRENT_TIMESTAMP NOT NULL,
+  PRIMARY KEY (client_registration_id, principal_name)
+);
+
+=== 적용 ===
+CREATE TABLE
+                                Table "public.oauth2_authorized_client"
+         Column          |            Type             | Collation | Nullable |         Default         
+-------------------------+-----------------------------+-----------+----------+-------------------------
+ client_registration_id  | character varying(100)      |           | not null | 
+ principal_name          | character varying(200)      |           | not null | 
+ access_token_type       | character varying(100)      |           | not null | 
+ access_token_value      | bytea                       |           | not null | 
+ access_token_issued_at  | timestamp without time zone |           | not null | 
+ access_token_expires_at | timestamp without time zone |           | not null | 
+ access_token_scopes     | character varying(1000)     |           |          | NULL::character varying
+ refresh_token_value     | bytea                       |           |          | 
+ refresh_token_issued_at | timestamp without time zone |           |          | 
+ created_at              | timestamp without time zone |           | not null | CURRENT_TIMESTAMP
+Indexes:
+    "oauth2_authorized_client_pkey" PRIMARY KEY, btree (client_registration_id, principal_name)
+
@@ -0,0 +1,20 @@
+=== Q3 검증 2번 — 저장소를 직접 열어 refresh token 이 평문인가 ===
+eyJhbGciOiJIUzUxMiIsInR5cCIgOiAiSldUIiwia2lkIiA6ICJlMmUzZDZkMy0yNzQyLTRhYWItYjk4Ni02ZDU2ZDM5MDk1ZDEifQ.eyJleHAiOjE3ODg1MDA0NDYsImlhdCI6MTc4ODQ5ODY0NiwianRpIjoiNTQwOTZmYTQtZWRjNi1iZjZkLWE4OGMtZDJhNjEzOGJjNmVlIiwiaXNzIjoiaHR0cHM6Ly9hdXRoLmh5ZW9ud29ya3MuY29tL3JlYWxtcy9rZXljbG9hay1wYXR0ZXJucyIsImF1ZCI6I
+
+=== access token 도 ===
+eyJhbGciOiJSUzI1NiIsInR5cCIgOiAiSldUIiwia2lkIiA6ICJPWS1jYVlETkdvUDRITUF6LVE5VVBUVS1ETTFpODk2TnV6VVp1NmdmQ3FNIn0.eyJleHAi
+
+=== 그 문자열이 실제 JWT 인지 — 헤더를 디코드 ===
+  File "<string>", line 3
+    h=open(/tmp/hdr.txt).read().strip()
+           ^
+SyntaxError: invalid syntax
+
+=== 저장된 바이트를 그대로 디코드한 결과 ===
+  refresh_token 헤더 : {"alg":"HS512","typ" : "JWT","kid" : "e2e3d6d3-2742-4aab-b986-6d56d39095d1"}
+  refresh_token 페이로드(앞부분):
+    {"exp":1788500446,"iat":1788498646,"jti":"54096fa4-edc6-bf6d-a88c-d2a6138bc6ee","iss":"https://auth.hyeonworks.com/realms/keycloak-patterns"
+  access_token 헤더  : {"alg":"RS256","typ" : "JWT","kid" : "OY-caYDNGoP4HMAz-Q9UPTU-DM1i896NuzUZu6gfCqM"}
+
+  → bytea 에 들어 있는 것은 암호화된 덩어리가 아니라 JWT 문자열 그대로다.
+    DB 읽기 권한만 있으면 그 자리에서 쓸 수 있는 토큰을 얻는다.
@@ -0,0 +1,25 @@
+=== [현재] 같은 사용자의 항목 ===
+ client_registration_id | principal_name |   access_token_issued_at   |              at_md5              
+------------------------+----------------+----------------------------+----------------------------------
+ keycloak               | labuser        | 2026-09-04 05:10:46.927192 | 675af2286bfc2fd9d2bab7bc8f391df7
+(1 row)
+
+  행 수: 1
+
+=== [모의 두 번째 브라우저] 세션만 지우고 같은 사용자로 다시 로그인시킨다 ===
+  (브라우저가 달라도 principal 은 같으므로 조회 키가 같다)
+  Redis 세션 삭제 완료 — 다음 요청이 새 로그인을 만든다
+=== [재로그인 후] 행이 늘었는가, 덮어써졌는가 ===
+ client_registration_id | principal_name |   access_token_issued_at   |              at_md5              
+------------------------+----------------+----------------------------+----------------------------------
+ keycloak               | labuser        | 2026-09-04 05:12:13.018828 | e19a63fc5aa18bd0a68b3e19dff16b3b
+(1 row)
+
+  행 수: 1
+
+  ★ 행 수가 1 그대로이고 md5 가 바뀌었으면 → 덮어쓰기다
+
+=== Q1 검증 ④ — 로그아웃하면 두 저장소가 다 정리되는가 ===
+  로그아웃 전
+    Redis: 1 키
+    PostgreSQL: 1 행
@@ -0,0 +1,14 @@
+=== Q1 검증 ④ — 로그아웃 후 두 저장소 상태 ===
+  Redis 세션      : 0 키
+  PostgreSQL 토큰 : 1 행
+
+ principal_name |   access_token_issued_at   |  access_token_expires_at   
+----------------+----------------------------+----------------------------
+ labuser        | 2026-09-04 05:12:13.018828 | 2026-09-04 05:13:13.018828
+(1 row)
+
+
+  ★ Redis 는 비었는데 PostgreSQL 에 행이 남아 있으면 → 한쪽만 정리된 것
+
+=== Keycloak 쪽 SSO 세션은? ===
+  Keycloak 온라인 세션: 2
@@ -0,0 +1,21 @@
+# B-2 — 다중 인스턴스 운영 증거
+
+2026-09-04 15:05–15:15 KST
+해설: [`docs/experiment-b2-multi-instance-session.md`](../../experiment-b2-multi-instance-session.md)
+
+| 파일 | 무엇을 보여주는가 |
+|---|---|
+| `01-jdbc-store-deploy.txt` | JDBC 저장소로 배포. **테이블이 조용히 안 만들어졌다** |
+| `02-schema.txt` | 원인 — 기본 DDL 은 `blob`(PostgreSQL 에 없음), `-postgres.sql` 판본이 따로 있다. **`PRIMARY KEY (client_registration_id, principal_name)`** — 조회 키 문제가 DDL 에 박혀 있다 |
+| `03-plaintext-tokens.txt` | **Q3 검증 2번** — `bytea` 안이 JWT 문자열 그대로. 디코드하면 `{"alg":"HS512",...}` |
+| `04-overwrite-test.txt` | **Q1 검증 3번** — 같은 사용자 재로그인 시 행 수 1 그대로, `issued_at` 과 md5 만 바뀜 = **UPDATE(덮어쓰기)** |
+| `05-logout-cleanup.txt` | **Q1 검증 4번** — Redis 0키 / PostgreSQL **1행 잔존** / Keycloak SSO **2세션 잔존** |
+| `b2-before-relogin.png` | JDBC 전환 직후, 옛 세션은 여전히 `false` |
+| `b2-tokens-shared-across-instances.png` | 재로그인 후 **`accessTokenStoredOnServer: true`** — 두 replica 에서 동작 |
+
+## 핵심 네 줄
+
+1. **세션 Redis + 토큰 PostgreSQL 분리 저장이 성립한다.** B-1 의 "로그인은 됐는데 토큰이 없는" 상태가 해결됐다.
+2. **refresh token 은 평문이다.** DB 읽기 권한이면 작동하는 토큰을 얻는다.
+3. **같은 사용자의 두 번째 로그인이 첫 번째를 덮어쓴다.** 기본키에 session id 가 없어 구조적으로 그렇다.
+4. **로그아웃은 셋 중 하나만 지운다.** 평문 토큰과 Keycloak SSO 세션이 남는다.
--- a/Show More
+++ b/Show More
Author	SHA1	Message	Date
DongHyeonkaandClaude Opus 5	df140ab218	docs: D-2 — rolling back the image does not roll back the schema Downgrading from 26.7.0 to 26.0 fails with liquibase ValidationFailedException on a changeset checksum, which is stricter than an unknown migration: the old version knows the changeset but its definition differs. The pod goes CrashLoopBackOff and never starts. The StatefulSet stopped the rollout at the first pod, so the other kept serving and the front door stayed at 200, which replica 1 would not have done. The failed start never touched the schema, so restoring the image was enough; had the migration already applied, the D-1 database restore would have been the only way back. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>	2026-09-04 15:05:36 +09:00
DongHyeonkaandClaude Opus 5	df5af95cb3	docs: D-1 — an empty database still answered 200 Dropping the schema left Keycloak serving realm metadata and JWKS from its Infinispan cache, so the front door stayed at 200 while only the paths that read the database failed. That is a different shape from A-2, where the connection itself broke and readiness pulled the pods out of the Service; here the connection is fine and the tables are simply gone, which the health check does not notice. Restoring the pg_dump took one second with zero errors and no pod restart, and the row counts matched the backup exactly, sessions included. The real RPO is the backup interval plus the synchronous_commit loss measured in A-3, and this dump sits in the host's /tmp, which is the same failure domain as the thing it protects. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>	2026-09-04 14:59:56 +09:00
DongHyeonkaandClaude Opus 5	6c310c93b7	docs: C-2 — nothing propagates because nobody implemented the receiving end Neither client had a backchannel logout URL and the BFF has no oidcLogout configuration, so the three candidate paths all answer 302, which is the authentication redirect rather than a handler. Setting the URL on the identity provider alone changed nothing: with a live session, logging the user out emptied the Keycloak side and left the Redis session untouched. Reachability is not the blocker here, since a Keycloak pod fetches the app's public URL with a 200, but that is a property of this tailnet split-DNS lab and is the assumption most likely to fail in production, where it fails silently. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>	2026-09-04 14:56:58 +09:00
DongHyeonkaandClaude Opus 5	e856e7af4d	docs: C-1 — killing the SSO session logs nobody out One user session carries a client session per application, so visiting the second app skips the login screen. Deleting the identity provider session leaves both application sessions untouched and both apps keep serving, because the identity provider, the application session and the access token each have their own lifetime. That inverts the B-2 finding: there the app session was cleared and the surviving SSO session let the user straight back in. Either way, clearing one side leaves the other. It also means an identity provider outage is a single point of failure for logging in, not for already-authenticated users, and the failure arrives late and all at once. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>	2026-09-04 14:49:36 +09:00
DongHyeonkaandClaude Opus 5	bcb563a04e	docs: B-7 — the cookie secret has no overlap window and rotation orphans sessions oauth2-proxy carries the authorization request in a signed cookie, so the callback can land on a different replica and still succeed, which is the opposite of the BFF failure in B-0. Sharing is therefore just sharing one Secret. Rotating it is all-or-nothing: --cookie-secret is singular, so there is no second key to read old tickets with, and the log shows both the validation failure and Error removing session, leaving the Redis session orphaned because the key cannot be derived from a ticket that will not decode. Getting there required two diagnoses: the callback 502 came from the full session riding in Set-Cookie past nginx's buffer, and every earlier attempt to read nginx config returned nothing because sudo on the host asks for a password while the guests do not. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>	2026-09-04 14:44:00 +09:00
DongHyeonkaandClaude Opus 5	aa2c3907f5	docs: B-6 — rotation is safe, retiring the old key is not Adding a higher-priority RSA provider leaves both kids in JWKS, so tokens signed before and after the rotation both validate. Deleting the old provider makes its tokens 401 immediately, and the resource server's JWKS cache does not buy a grace period because an unknown kid triggers a refetch. The encryption key Q3 asks about does not exist yet, since B-2 showed the tokens are stored as plaintext JWTs, so the measured signing-key rotation is what its design has to copy: write with one key, read with several, and keep the overlap longer than the lifetime of anything signed with the old one. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>	2026-09-04 14:33:42 +09:00
DongHyeonkaandClaude Opus 5	f45a2a2aaa	docs: B-5 — the pod stays Ready while every request hangs Stopping Redis returns HTTP 000 rather than an error because the client waits on reconnect, and the pod keeps serving traffic because the redis health indicator is not in the readiness group even though /actuator/health returns 503. That is the mirror image of A-2, where Keycloak put its database check in readiness and the pods left the Service. Turning on AOF with config set created the appendonlydir and still lost everything on pod deletion, because /data was the container filesystem; adding a PVC makes the same setting work. Volume first, persistence setting second. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>	2026-09-04 14:29:17 +09:00
DongHyeonkaandClaude Opus 5	7dc0a3e5da	docs: B-4 — the edge does not overwrite the headers it never sets Two headers of the same name both arrive rather than one overwriting the other, because nginx only replaces headers it sets with proxy_set_header. A comma inside a role name is indistinguishable from the delimiter, and the size limit is a cliff: Tomcat returns 400 around 8KB and the connection dies around 16KB, so the same cause produces two different-looking failures. Forged identity headers reach the upstream untouched while the JWT-protected paths return 401, which is Q4's own point that a header-fed upstream has nothing to verify against. By Q4's checklist that answer alone points at the BFF structure. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>	2026-09-04 14:23:41 +09:00
DongHyeonkaandClaude Opus 5	b16e1dccf7	docs: B-3 — concurrent refresh does not lose a race, it destroys the session Five simultaneous refreshes with one token return a single 200, and that winner's new token is already dead. Reuse detection removes the client session while the user session stays, which is why the other responses read Session doesn't have required client rather than a reuse error. Comparing policies shows rotation off passes all five and keeps the session, while raising refreshTokenMaxReuse to one still destroys it. Since no retry can recover a removed client session, Q2's own criterion resolves to a lock, and a database row lock is the natural place because its lifetime is tied to the connection. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>	2026-09-04 14:20:04 +09:00
DongHyeonkaandClaude Opus 5	711878379c	docs: B-2 — sharing the stores fixes one problem and exposes three more Moving the authorized client to JdbcOAuth2AuthorizedClientService makes tokens work across replicas, so the session-in-Redis plus tokens-in-PostgreSQL split holds. The table then shows what sharing cannot fix: the primary key is (client_registration_id, principal_name) with no session in it, so a second login for the same user updates the same row rather than adding one. The refresh token sits in bytea as the raw JWT, readable with convert_from, and logout clears only the Redis session while the plaintext token row and the Keycloak SSO session both survive. The schema itself failed silently first because the default DDL uses blob, which PostgreSQL does not have, and continue-on-error swallowed it. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>	2026-09-04 14:15:05 +09:00
DongHyeonkaandClaude Opus 5	f2595f748f	docs: B-1 — Redis moves the session and leaves the tokens behind Adding Spring Session Redis grows the context by 81 beans and swaps sessionRepository for RedisSessionRepository, while authorizedClientService stays InMemoryOAuth2AuthorizedClientService. The user then reads as logged in with principal labuser while accessTokenStoredOnServer is false, which is worse than being logged out. Redis holds only the security context, serialized with Java native serialization, and the refresh token is not there to encrypt in the first place. Three problems on the way: Kubernetes service links overwrote REDIS_PORT with a tcp:// URL, the tests tried to reach Redis, and the resource server was never deployed so a DNS failure looked like a token failure. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>	2026-09-04 14:05:02 +09:00
DongHyeonkaandClaude Opus 5	e62bbb4df0	docs: B-0 — deploy the BFF and read what autoconfiguration actually chose The authorized client repository is AuthenticatedPrincipalOAuth2AuthorizedClientRepository, keyed by principal with no session id in it, which is the mechanism behind the sharing problem Q1 and Q3 describe. Sharing a store does not fix a lookup key. Five problems on the way in: only build output was committed under bff/, a duplicate YAML key broke the image build and was invisible until the full log was captured, env placeholders without defaults broke the tests, actuator was behind the login redirect so a 200 was the login page, and the 117KB beans response failed through the proxy. Deploying two replicas made the login itself fail before any experiment started, because the authorization request lives in per-instance memory and the callback lands elsewhere. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>	2026-09-04 13:48:33 +09:00
DongHyeonkaandClaude Opus 5	8f6d67df35	docs: A-7 — three results invert when persistent sessions are turned off Disabling persistent-user-sessions moves the session from PostgreSQL into the cluster, and the A-1 and A-8 outcomes flip to 400 Session not active while a new login during database loss starts working. The control group in each case still returns 200, so the injections cut only what they were meant to cut. This is the pair that makes the A layer legible: the conventional wisdom that sessions ride TCP 7800 is correct for Keycloak 24 and earlier, and the mistake is applying it to 26 without checking the version. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>	2026-09-04 13:33:33 +09:00
DongHyeonkaandClaude Opus 5	114d21aebe	docs: A-8 — a rolling restart keeps every session and drops only the cache Nine samples through the restart all returned 200, the refresh token issued beforehand still works, and the session count is unchanged at 151 while both caches reset to zero. The updated last_session_refresh proves the write path recovered too, not just the response code. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>	2026-09-04 13:20:56 +09:00
				`@@ -0,0 +1 @@`
				`[ 207ms] [ERROR] Failed to load resource: the server responded with a status of 404 () @ https://app1.hyeonworks.com/favicon.ico:0`
				`@@ -0,0 +1 @@`
				`[ 236ms] [ERROR] Failed to load resource: the server responded with a status of 500 () @ https://app1.hyeonworks.com/bff/api/me:0`
				`@@ -0,0 +1 @@`
				`[ 307ms] [ERROR] Failed to load resource: the server responded with a status of 401 () @ https://app2.hyeonworks.com/favicon.ico:0`
				`@@ -0,0 +1 @@`
				`[ 261ms] [ERROR] Failed to load resource: the server responded with a status of 401 () @ https://app2.hyeonworks.com/favicon.ico:0`
				`@@ -0,0 +1 @@`
				`[ 882ms] [ERROR] Failed to load resource: the server responded with a status of 401 () @ https://app2.hyeonworks.com/favicon.ico:0`
				`@@ -0,0 +1 @@`
				`[ 178ms] [ERROR] Failed to load resource: the server responded with a status of 401 () @ https://app2.hyeonworks.com/favicon.ico:0`
				`@@ -0,0 +1 @@`
				`- generic [active] [ref=f28e1]: "{\"pattern\":\"AP3-backend-for-frontend\",\"principal\":\"labuser\",\"accessTokenStoredOnServer\":true,\"refreshTokenStoredOnServer\":true,\"browserTokenCount\":0,\"csrfProtectionEnabled\":true}"`
				`@@ -0,0 +1 @@`
				`- generic [active] [ref=f30e1]: "{\"pattern\":\"AP3-backend-for-frontend\",\"principal\":\"labuser\",\"accessTokenStoredOnServer\":false,\"refreshTokenStoredOnServer\":false,\"browserTokenCount\":0,\"csrfProtectionEnabled\":true}"`
				`@@ -0,0 +1 @@`
				`- generic [active] [ref=f32e1]: "{\"pattern\":\"AP3-backend-for-frontend\",\"principal\":\"labuser\",\"accessTokenStoredOnServer\":false,\"refreshTokenStoredOnServer\":false,\"browserTokenCount\":0,\"csrfProtectionEnabled\":true}"`