diff --git a/internal/api/modules/amp/proxy.go b/internal/api/modules/amp/proxy.go
index e2b68b85..c9b992cb 100644
--- a/internal/api/modules/amp/proxy.go
+++ b/internal/api/modules/amp/proxy.go
@@ -190,7 +190,8 @@ func createReverseProxy(upstreamURL string, secretSource SecretSource) (*httputi
 	// Error handler for proxy failures
 	proxy.ErrorHandler = func(rw http.ResponseWriter, req *http.Request, err error) {
 		// Client-side cancellations are common during polling; suppress logging in this case
-		if err == context.Canceled {
+		if errors.Is(err, context.Canceled) {
+			rw.WriteHeader(gin.StatusClientClosedRequest)
 			return
 		}
 		log.Errorf("amp upstream proxy error for %s %s: %v", req.Method, req.URL.Path, err)