Simplify error response when accessing MCP without session ID #577
Description
Description:
Currently, when accessing the MCP Streamable HTTP server at https://host:port/mcp without providing a session ID, the server responds with the full exception stack trace and detailed error information.
Issue:
Returning the complete stack trace in the response is not user-friendly and may expose internal details unnecessarily.
Suggestion:
Instead of returning the full error, return a simple, clear message indicating there is an issue with the request headers or the session ID
stack trace
{
"cause": null,
"stackTrace": [
{
"moduleName": null,
"moduleVersion": null,
"classLoaderName": null,
"methodName": "doGet",
"fileName": "HttpServletStreamableServerTransportProvider.java",
"lineNumber": 268,
"className": "com.ibm.modelcontextprotocol.server.transport.HttpServletStreamableServerTransportProvider",
"nativeMethod": false
},
{
"moduleName": null,
"moduleVersion": null,
"classLoaderName": null,
"methodName": "service",
"fileName": "HttpServlet.java",
"lineNumber": 527,
"className": "jakarta.servlet.http.HttpServlet",
"nativeMethod": false
},
{
"moduleName": null,
"moduleVersion": null,
"classLoaderName": null,
"methodName": "service",
"fileName": "HttpServlet.java",
"lineNumber": 614,
"className": "jakarta.servlet.http.HttpServlet",
"nativeMethod": false
}
],
"jsonRpcError": null,
"message": "text/event-stream required in Accept header; Session ID required in mcp-session-id header",
"localizedMessage": "text/event-stream required in Accept header; Session ID required in mcp-session-id header",
"suppressed": []
}