From cf55a88ce3f7218850c35a7fab7c868a49d060f8 Mon Sep 17 00:00:00 2001
From: Remember <36129334+wuqinqiang@users.noreply.github.com>
Date: Sat, 27 Sep 2025 20:48:35 +0800
Subject: [PATCH] fix(rest): change SSE SetWriteDeadline error log to debug
 level (#5162)

---
 rest/engine.go | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/rest/engine.go b/rest/engine.go
index 87a3d340e..b704ca12c 100644
--- a/rest/engine.go
+++ b/rest/engine.go
@@ -389,7 +389,9 @@ func buildSSERoutes(routes []Route) []Route {
 			// because SSE requires the connection to be kept alive indefinitely.
 			rc := http.NewResponseController(w)
 			if err := rc.SetWriteDeadline(time.Time{}); err != nil {
-				logc.Errorf(r.Context(), "set conn write deadline failed: %v", err)
+				// Some ResponseWriter implementations (like timeoutWriter) don't support SetWriteDeadline.
+				// This is expected behavior and doesn't affect SSE functionality.
+				logc.Debugf(r.Context(), "unable to clear write deadline for SSE connection: %v", err)
 			}
 
 			w.Header().Set(header.ContentType, header.ContentTypeEventStream)