Fix _SWITCH_UPGRADE without proposal error message

karpetrosyan · web-flow · commit 0c08b7ccd87c · 2024-03-02T08:12:48.000-06:00
diff --git a/h11/_state.py b/h11/_state.py
@@ -283,9 +283,7 @@ def process_event(
             assert role is SERVER
             if server_switch_event not in self.pending_switch_proposals:
                 raise LocalProtocolError(
-                    "Received server {} event without a pending proposal".format(
-                        server_switch_event
-                    )
+                    "Received server _SWITCH_UPGRADE event without a pending proposal"
                 )
             _event_type = (event_type, server_switch_event)
         if server_switch_event is None and _event_type is Response:
