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FastAPI mount FastMCP didn't use /mcp path #189

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MarshallEriksen-shaomingyang opened this issue Apr 17, 2025 · 1 comment · Fixed by #390
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FastAPI mount FastMCP didn't use /mcp path #189

MarshallEriksen-shaomingyang opened this issue Apr 17, 2025 · 1 comment · Fixed by #390

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@MarshallEriksen-shaomingyang
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I use FastAPI.mount(path="/mcp", app=FastMCP.sse_app()) and It works but client request wrong path

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@jlowin
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jlowin commented Apr 20, 2025

I believe this is a known issue with the SSE app, see e.g. modelcontextprotocol/python-sdk#386 and modelcontextprotocol/python-sdk#540 which both attempt to fix it. It will need to be fixed in the low-level SDK if that's the case.

@jlowin jlowin closed this as completed Apr 20, 2025
@jlowin jlowin mentioned this issue May 9, 2025
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Ensure FastMCP handles nested SSE and SHTTP apps properly in ASGI frameworks jlowin/fastmcp
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@jlowin @MarshallEriksen-shaomingyang