Connecting to SSE server running with Dockerfile not working

I am running an SSE server with the given Dockerfile in packages/markitdown/packages/markitdown-mcp and using the flags --sse --host 127.0.0.1 --port 3001.

In Docker it shows that it is running as per the logs

2025-04-25 17:45:08 INFO:     Started server process [1]
2025-04-25 17:45:08 INFO:     Waiting for application startup.
2025-04-25 17:45:08 INFO:     Application startup complete.
2025-04-25 17:45:08 INFO:     Uvicorn running on http://127.0.0.1:3001 (Press CTRL+C to quit)

But when I try to inspect the MCP server using npx @modelcontextprotocol/inspector and enter 'http://localhost:3001/sse' into the MCP server URL and clicking Connect, it shows this Connection Error, is your MCP server running? and in the logs of the inspector it shows this

Error in /sse route: SseError: SSE error: TypeError: fetch failed: other side closed
    at _eventSource.onerror (file:///Users/fazasophian/.npm/_npx/5a9d879542beca3a/node_modules/@modelcontextprotocol/sdk/dist/esm/client/sse.js:69:31)
    at EventSource.scheduleReconnect_fn (file:///Users/fazasophian/.npm/_npx/5a9d879542beca3a/node_modules/eventsource/dist/index.js:248:53)
    at file:///Users/fazasophian/.npm/_npx/5a9d879542beca3a/node_modules/eventsource/dist/index.js:98:174 {
  code: undefined,
  event: {
    type: 'error',
    message: 'TypeError: fetch failed: other side closed',
    code: undefined,
    defaultPrevented: false,
    cancelable: false,
    timeStamp: 135798.814292
  }
}

Even when I am trying to connect to it using modelcontextprotocol's typescript-sdk, it also is unable to connect to the MCP server.

Anyone able to help?

Thanks in advance

Start with the Dockerfile and the server entry point under packages/markitdown/packages/markitdown-mcp, then reproduce the launch using --sse, --host 127.0.0.1, and --port 3001. Compare the container's reported address with the URL used by @modelcontextprotocol/inspector and the TypeScript SDK. Done means the inspector can connect to http://localhost:3001/sse without the connection error.