Which runtime causes the MCP SSE server to fail?
The bun runtime causes the SSE connection to remain pending and fail.
@the-vampiire
基本信息
demo of MCP SSE server limitations using the bun runtime
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A reproducible demo that shows an MCP SSE server fails when run with the bun runtime but succeeds when run with Node.js.
Install dependencies with bun install (or npm/yarn/pnpm). Run the MCP inspector with npm run inspect and open it at http://localhost:5173. Select SSE as the transport and enter http://localhost:3500/sse as the URL. In a separate terminal, start the server with npm run start:bun to observe the failure, then kill it and run npm run start:node to see the success.
The bun runtime causes the SSE connection to remain pending and fail.
Node.js works correctly, showing a successful SSE connection and message posting.
The demo uses the SSE (Server-Sent Events) transport.
The MCP inspector, opened at `http://localhost:5173`, is used to test the connection.
Open the browser’s developer tools network tab while using the MCP inspector.
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