diff --git a/deploy/reverse-proxy/keycloak.env.example b/deploy/reverse-proxy/keycloak.env.example
new file mode 100644
index 0000000..8056c8c
--- /dev/null
+++ b/deploy/reverse-proxy/keycloak.env.example
@@ -0,0 +1,6 @@
+# Keycloak receives HTTP only from the trusted reverse proxy.
+KC_HTTP_ENABLED=true
+KC_PROXY_HEADERS=xforwarded
+KC_HOSTNAME=https://auth.example.test
+KC_HOSTNAME_STRICT=true
+
diff --git a/deploy/reverse-proxy/nginx-keycloak.conf b/deploy/reverse-proxy/nginx-keycloak.conf
new file mode 100644
index 0000000..9f68882
--- /dev/null
+++ b/deploy/reverse-proxy/nginx-keycloak.conf
@@ -0,0 +1,14 @@
+server {
+    listen 8080;
+    server_name auth.example.test;
+
+    location / {
+        proxy_pass http://keycloak:8080;
+        proxy_http_version 1.1;
+        proxy_set_header Host $host;
+        proxy_set_header X-Forwarded-Host $host;
+        proxy_set_header X-Forwarded-Port 443;
+        proxy_set_header X-Forwarded-Proto https;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+    }
+}
diff --git a/docs/reverse-proxy-headers.md b/docs/reverse-proxy-headers.md
new file mode 100644
index 0000000..902b816
--- /dev/null
+++ b/docs/reverse-proxy-headers.md
@@ -0,0 +1,15 @@
+# Reverse proxy headers
+
+TLS를 reverse proxy에서 종료하면 Keycloak은 브라우저가 사용한 외부 origin을
+정확히 알아야 한다. 배포 예제는 다음 계약을 함께 적용한다.
+
+- nginx는 `Host`, `X-Forwarded-Host`, `X-Forwarded-Port`,
+  `X-Forwarded-Proto`, `X-Forwarded-For`를 덮어쓴다.
+- Keycloak은 `KC_PROXY_HEADERS=xforwarded`로 그 헤더 형식을 명시한다.
+- `KC_HOSTNAME`은 외부 HTTPS URL로 고정하고 strict hostname 검증을 켠다.
+- Keycloak의 8080 포트는 public으로 publish하지 않고 proxy network에서만
+  접근시킨다. 신뢰되지 않은 클라이언트가 forwarded header를 직접 넣을 수
+  있으면 안 된다.
+
+`scripts/verify-reverse-proxy-headers.sh`는 양쪽 설정의 짝과 nginx 구문을
+검증한다.
diff --git a/scripts/verify-reverse-proxy-headers.sh b/scripts/verify-reverse-proxy-headers.sh
new file mode 100755
index 0000000..3a1e526
--- /dev/null
+++ b/scripts/verify-reverse-proxy-headers.sh
@@ -0,0 +1,18 @@
+#!/usr/bin/env sh
+set -eu
+
+config=deploy/reverse-proxy/nginx-keycloak.conf
+env_file=deploy/reverse-proxy/keycloak.env.example
+
+grep -q 'proxy_set_header X-Forwarded-Host' "$config"
+grep -q 'proxy_set_header X-Forwarded-Port 443' "$config"
+grep -q 'proxy_set_header X-Forwarded-Proto https' "$config"
+grep -q '^KC_PROXY_HEADERS=xforwarded$' "$env_file"
+grep -q '^KC_HOSTNAME=https://' "$env_file"
+
+docker run --rm \
+  --add-host keycloak:127.0.0.1 \
+  -v "$PWD/$config:/etc/nginx/conf.d/default.conf:ro" \
+  nginx:1.29-alpine nginx -t
+
+echo "Reverse-proxy header and Keycloak hostname contracts verified"