diff --git a/pkg/apiserver/handlers.go b/pkg/apiserver/handlers.go
index 35d4e5af789..e82e7836f69 100644
--- a/pkg/apiserver/handlers.go
+++ b/pkg/apiserver/handlers.go
@@ -152,6 +152,7 @@ func RecoverPanics(handler http.Handler) http.Handler {
 				http.StatusNotFound,
 				http.StatusUnauthorized,
 				http.StatusForbidden,
+				http.StatusNotModified,
 				errors.StatusUnprocessableEntity,
 				http.StatusSwitchingProtocols,
 			),