fix: add CORS logging middleware and redeploy

backend/common/middleware.py

@@ -34,3 +34,19 @@ async def dispatch(self, request: Request, call_next):
                 status_code=500,
                 content={"detail": "Internal Server Error"}
             )
+
+class CORSLoggingMiddleware(BaseHTTPMiddleware):
+    """
+    Middleware to log CORS related information.
+    Checks if Origin header is present but Access-Control-Allow-Origin is missing in response.
+    """
+    async def dispatch(self, request: Request, call_next):
+        origin = request.headers.get("origin")
+        response = await call_next(request)
+
+        # Log if origin is present but no CORS headers in response
+        if origin and "access-control-allow-origin" not in response.headers:
+            logger = get_logger("backend.middleware.cors")
+            logger.warning(f"CORS Missing Header for origin: {origin} - Path: {request.url.path}")
+
+        return response

backend/main.py

@@ -7,7 +7,7 @@
 from fastapi import FastAPI
 from fastapi.middleware.cors import CORSMiddleware
 
-from backend.common.middleware import PathRewriteMiddleware, ExceptionHandlingMiddleware
+from backend.common.middleware import PathRewriteMiddleware, ExceptionHandlingMiddleware, CORSLoggingMiddleware
 from backend.api.problems import router as problems_router
 from backend.api.sql import router as sql_router
 from backend.api.stats import router as stats_router
@@ -133,6 +133,10 @@ def start_scheduler_background():
         allow_methods=["*"],
         allow_headers=["*"],
     )
+
+# CORS Logging Middleware 등록
+# CORS 미들웨어보다 나중에 등록하여 바깥쪽에 위치하게 함 (응답 헤더 확인용)
+app.add_middleware(CORSLoggingMiddleware)
 
 # 404 및 기타 에러 로깅 미들웨어
 @app.middleware("http")