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KeyError: 'websockets-sansio' when running FastMCP server with streamable-http transport

The error suggests that uvicorn is trying to use a websocket protocol named 'websockets-sansio' which doesn't exist in the WS_PROTOCOLS dictionary. The valid ...
GitHub

[chat example] How to simulate slow connection?

[chat example] How to simulate slow connection? · Issue #542 · coder/websocket · GitHub coder / websocket Public Notifications Fork 331 Star 4.7k ...