Merge pull request #3308 from TnTomato/fix-WebSocketClientConnection-…

…parameter Fix WebSocketClientConnection parameter
tornadoweb · Sep 2, 2023 · a48d634 · a48d634
2 parents 95821a1 + d850248
commit a48d634
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/tornado/websocket.py b/tornado/websocket.py
@@ -1357,7 +1357,7 @@ def __init__(
         ping_interval: Optional[float] = None,
         ping_timeout: Optional[float] = None,
         max_message_size: int = _default_max_message_size,
-        subprotocols: Optional[List[str]] = [],
+        subprotocols: Optional[List[str]] = None,
         resolver: Optional[Resolver] = None,
     ) -> None:
         self.connect_future = Future()  # type: Future[WebSocketClientConnection]