feat: silence context expired errors

closes #49

internal/proxy/server.go

@@ -233,9 +233,7 @@ func (s *Server) handleDefault(w http.ResponseWriter, r *http.Request) {
 func (s *Server) handleError(w http.ResponseWriter, r *http.Request, status int, err error) {
 	err = errors.WithStack(err)
 
-	if errors.Is(err, context.Canceled) {
-		logger.Warn(r.Context(), err.Error(), logger.E(err))
-	} else {
+	if !errors.Is(err, context.Canceled) {
 		logger.Error(r.Context(), err.Error(), logger.CapturedE(err))
 	}