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MCP SDK Can not handle the MCP Servers with subpath #471

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tobegit3hub opened this issue May 9, 2025 · 0 comments
Open

MCP SDK Can not handle the MCP Servers with subpath #471

tobegit3hub opened this issue May 9, 2025 · 0 comments
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@tobegit3hub
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Issue:
Clients (Inspector/Cherry Studio) fail to connect when MCP Server uses a subpath (e.g., http://domain.com/subpath/sse). Root paths (http://domain.com/) work normally.

Reproduce:

  1. Start MCP Server at http://domain.com/subpath/sse
  2. Client connection fails with error:
    Error POSTing to endpoint (HTTP 503): no healthy upstream

Cause:
In sse.ts#L146, new URL() discards the subpath from the server URL. Example:
Request to /messages/ becomes http://domain.com/messages/ instead of http://domain.com/subpath/messages/.
@tobegit3hub tobegit3hub added the bug Something isn't working label May 9, 2025
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@tobegit3hub