Avoid shutdown on closed socket.

Fix #1072.
python-websockets · Nov 6, 2021 · 460b6f8 · 460b6f8
1 parent ed9a7b4
commit 460b6f8
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/src/websockets/legacy/protocol.py b/src/websockets/legacy/protocol.py
@@ -1303,7 +1303,7 @@ async def close_connection(self) -> None:
                     self.logger.debug("! timed out waiting for TCP close")
 
             # Half-close the TCP connection if possible (when there's no TLS).
-            if self.transport.can_write_eof():
+            if self.transport.can_write_eof() and not self.transport.is_closing():
                 if self.debug:
                     self.logger.debug("x half-closing TCP connection")
                 self.transport.write_eof()