Restore correct part of original commitrevert-11293-bpo35565

1 files changed, 2 insertions, 1 deletions

diff --git a/Lib/wsgiref/handlers.py b/Lib/wsgiref/handlers.py
index f4300b831a..28ed9b7a6d 100644
--- a/Lib/wsgiref/handlers.py
+++ b/Lib/wsgiref/handlers.py
@@ -233,7 +233,8 @@ class BaseHandler:
             for name, val in headers:
                 name = self._convert_string_type(name, "Header name")
                 val = self._convert_string_type(val, "Header value")
-                assert not is_hop_by_hop(name),"Hop-by-hop headers not allowed"
+                assert not is_hop_by_hop(name),\
+                       f"Hop-by-hop header, '{name}: {val}', not allowed"
 
         return self.write