mcp-simple-streamablehttp-stateless not working as expected

[ruspaul013]

Describe the bug
MCP client ( Roo Code ), get stuck when connecting to the mcp-simple-streamablehttp-stateless example.

To Reproduce
Steps to reproduce the behavior:

1. run the mcp-simple-streamablehttp-stateless as describe in the docs
2. connect a MCP client to the server

Expected behavior
The MCP client to connect to the MCP server.

Screenshots

Desktop (please complete the following information):

• OS: "AlmaLinux 9.6 (Sage Margay)"

Additional context
Add any other context about the problem here.
Logs:

[root@base-machine simple-streamablehttp-stateless]# uv run mcp-simple-streamablehttp-stateless --port 3000
INFO:     Started server process [3711179]
INFO:     Waiting for application startup.
2025-05-23 08:27:33,824 - mcp.server.streamable_http_manager - INFO - StreamableHTTP session manager started
2025-05-23 08:27:33,824 - mcp_simple_streamablehttp_stateless.server - INFO - Application started with StreamableHTTP session manager!
INFO:     Application startup complete.
INFO:     Uvicorn running on http://0.0.0.0:3000 (Press CTRL+C to quit)
INFO:     10.150.92.131:50650 - "GET / HTTP/1.1" 200 OK

[ihrpr]

Please can you share the client you are connecting to, have you tried testing with inspector?

[ruspaul013]

Please can you share the client you are connecting to, have you tried testing with inspector?

I tried with https://github.com/RooVetGit/Roo-Code. I will try also with inspector.