From d8502489b5343aa435fcd13ea418ab09d1f04326 Mon Sep 17 00:00:00 2001
From: Chengzzzi <36990436+TnTomato@users.noreply.github.com>
Date: Fri, 11 Aug 2023 17:32:59 +0800
Subject: [PATCH] Fix WebSocketClientConnection parameter

---
 tornado/websocket.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tornado/websocket.py b/tornado/websocket.py
index 165cc316d..fbfd70088 100644
--- a/tornado/websocket.py
+++ b/tornado/websocket.py
@@ -1357,7 +1357,7 @@ class WebSocketClientConnection(simple_httpclient._HTTPConnection):
         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]
-- 
2.47.2