MCP transport HTTP SSE details

[gmaOCR]

Hello Stephan and thanks for this repo.
I've tried to connect the client on a Python server (fastmcp SDK). I've got some issue with session_id when resuming an existing chatbot discussion. I tried to solve and now I'm stuck before, on the http sse transport layer. The plugin is totally stuck when I fetch it with the MCP.

I"ve seen some details in HttpMcpTransport.java but can"t debug on the plugin side. I think there is an issue somewhere before or after the initialize challenge.

INFO:     127.0.0.1:37034 - "POST /mcp HTTP/1.1" 200 OK
INFO:     127.0.0.1:45814 - "GET /debug/logs HTTP/1.1" 200 OK
2025-06-02 16:42:13,036 - INFO - DEBUG EVENT: SSE_CONNECTION - {'session_id': 'sse_12_1748875333', 'client_ip': '192.168.1.71'}
2025-06-02 16:42:13,036 - INFO - Connexion SSE établie, envoi de l'endpoint - Session: sse_12_1748875333
2025-06-02 16:42:13,036 - INFO - DEBUG EVENT: SSE_ENDPOINT_SENT - {'session_id': 'sse_12_1748875333'}
INFO:     192.168.1.71:46926 - "GET /sse HTTP/1.1" 200 OK
2025-06-02 16:42:13,036 - INFO - DEBUG EVENT: SSE_CONNECTION_CLOSED - {'session_id': 'sse_12_1748875333'}
2025-06-02 16:42:13,064 - INFO - POST Request Body: {
  "jsonrpc": "2.0",
  "id": 0,
  "method": "initialize",
  "params": {
    "protocolVersion": "2024-11-05",
    "capabilities": {
      "roots": {
        "listChanged": false
      }
    },
    "clientInfo": {
      "name": "DevoxxGenie",
      "version": "1.0"
    }
  }
}
2025-06-02 16:42:13,064 - INFO - DEBUG EVENT: MCP_REQUEST_RECEIVED - {'session_id': 'mcp_13_1748875333', 'client_ip': '192.168.1.71', 'body_length': 187}
2025-06-02 16:42:13,064 - INFO - DEBUG EVENT: MCP_REQUEST_PARSED - {'session_id': 'mcp_13_1748875333', 'method': 'initialize', 'id': 0, 'has_params': True}
2025-06-02 16:42:13,065 - INFO - DEBUG EVENT: MCP_PROCESSING_REQUEST - {'session_id': 'mcp_13_1748875333', 'method': 'initialize'}
2025-06-02 16:42:13,065 - INFO - Traitement de la méthode: initialize
2025-06-02 16:42:13,065 - INFO - Initialisation avec params: {'protocolVersion': '2024-11-05', 'capabilities': {'roots': {'listChanged': False}}, 'clientInfo': {'name': 'DevoxxGenie', 'version': '1.0'}}
2025-06-02 16:42:13,065 - INFO - DEBUG EVENT: MCP_RESPONSE_SENT - {'session_id': 'mcp_13_1748875333', 'response_type': 'json', 'has_result': True, 'has_error': False}
INFO:     192.168.1.71:46926 - "POST /mcp HTTP/1.1" 200 OK

Plugin freeze exactly at this step, on the last POST