feat: add stateless streamable http mode (#8) #15
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2 tasks
DouweM
requested changes
Oct 21, 2025
mcp_run_python/deno/src/main.ts
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| res.end() | ||
| } | ||
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| function createPathMatcher(req: http.IncomingMessage, url: URL) { |
mcp_run_python/deno/src/main.ts
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| } | ||
| } | ||
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| function pathMatch(req: http.IncomingMessage, url: URL) { |
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@PeterRodenkirchAA Sorry for the delay here! @Kludex As our resident MCP maintainer, do you have any concerns with this? |
Kludex
reviewed
Oct 22, 2025
mcp_run_python/deno/src/main.ts
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Comment on lines
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| } else if (match('GET', '/mcp')) { | ||
| // SSE notifications not supported in stateless mode | ||
| httpSetJsonResponse(res, 405, 'Method not allowed.', -32000) | ||
| } else if (match('DELETE', '/mcp')) { | ||
| // Session termination not needed in stateless mode | ||
| httpSetJsonResponse(res, 405, 'Method not allowed.', -32000) | ||
| } else if (pathMatch(req, url)) { | ||
| httpSetTextResponse(res, 405, 'Method not allowed') | ||
| } else { | ||
| httpSetTextResponse(res, 404, 'Page not found') | ||
| } |
Member
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Why are we doing so much manually? Doesn't the MCP package handles those?
Author
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Good point, this is already handled by handleRequest() from the MCP SDK. I adapted this part now.
Member
Conceptually this seems fine. |
Author
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@PeterRodenkirchAA Thanks Peter, looks good to me! @Kludex Can you have a final look too please? Feel free to merge and release. |
Author
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@Kludex just a small ping since we currently depend on the fork, would this be fine to merge? |
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I just ran into this too 🙏 |
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Related Issue: #8
Why?
The overhead of a stateful streamable HTTP mode might not be necessary for a lot of use cases that submit a simple code execution task via POST request.
We observed some issue with the stateful mode concerning pending GET requests and supporting a stateless mode would simplify the MCP server integration.
What?
New mode:
streamable_http_statelessPOST /mcp.GET /mcpandDELETE /mcpreturn 405 -> server-to-client notifications are not supported.CLI and Python API
streamable-http-statelessas a mode:uvx mcp-run-python streamable-http-stateless --port 3001TypeScript part:
runStreamableHttpdelegates to:createStatefulHttpServer(...)createStatelessHttpServer(...)createPathMatcher(req, url)andpathMatch(req, url)Usage