--- a/mercurial/hgweb/wsgiheaders.py	Mon Sep 16 15:36:38 2024 +0200
+++ b/mercurial/hgweb/wsgiheaders.py	Mon Sep 16 15:36:44 2024 +0200
@@ -9,6 +9,7 @@
 
 # Regular expression that matches `special' characters in parameters, the
 # existence of which force quoting of the parameter value.
+from __future__ import annotations
 
 import re