From 6c90468c5abaf71ebe90ba1e1e81b26e81d90f38 Mon Sep 17 00:00:00 2001
From: DongHyeonka <ehdgus6435@kumoh.ac.kr>
Date: Thu, 3 Sep 2026 13:44:29 +0900
Subject: [PATCH] feat: report pod address from echo endpoint

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
---
 .../main/java/com/example/keycloakpattern/ApiController.java   | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/backend/src/main/java/com/example/keycloakpattern/ApiController.java b/backend/src/main/java/com/example/keycloakpattern/ApiController.java
index 819ad92..edf7498 100644
--- a/backend/src/main/java/com/example/keycloakpattern/ApiController.java
+++ b/backend/src/main/java/com/example/keycloakpattern/ApiController.java
@@ -43,6 +43,9 @@ public class ApiController {
         Map<String, Object> response = new LinkedHashMap<>();
         response.put("headers", headers);
         response.put("remoteAddr", request.getRemoteAddr());
+        // Pod IP. Identifies which replica answered, which is what makes the
+        // host nginx upstream distribution and the sticky-session switch observable.
+        response.put("localAddr", request.getLocalAddr());
         response.put("scheme", request.getScheme());
         response.put("secure", request.isSecure());
         response.put("serverName", request.getServerName());