[Bug]: `mcpm router on`, mcp/inspector is error at streamable-http-protocol

[kongqy]

Issue Type

Bug Report

Description

Win11

Steps to Reproduce

error detail:

Received POST message for sessionId undefined
New streamable-http connection
Query parameters: [Object: null prototype] {
  url: 'http://localhost:6276/mcp/',
  transportType: 'streamable-http'
}
Connected to Streamable HTTP transport
Connected MCP client to backing server transport
Created streamable web app transport aed0221c-0ff5-4cbc-9bc7-edf912bb686e
Error from MCP server: TypeError: fetch failed
    at node:internal/deps/undici/undici:13510:13
    at process.processTicksAndRejections (node:internal/process/task_queues:105:5)
    at async StreamableHTTPClientTransport.send (file:///D:/Tools/NodeJS/node-v22.15.0-win-x64/node_modules/@modelcontextprotocol/inspector/node_modules/@modelcontextprotocol/sdk/dist/esm/client/streamableHttp.js:248:30) {
  [cause]: AggregateError [ECONNREFUSED]:
      at internalConnectMultiple (node:net:1139:18)
      at afterConnectMultiple (node:net:1714:7) {
    code: 'ECONNREFUSED',
    [errors]: [ [Error], [Error] ]
  }
}

Additional Information

No response

[JoJoJoJoJoJoJo]

Thanks for the report! This is probably due to the profile header is missing, so that the router can't find a valid server config (unfortunately mcp inspector doesn't support custom headers for now). I will try to catch the error and provide user-friendly output.