Unable to work properly with SSE transport when perform long time task

[huang-sh]

Dear mcp team,

Describe the bug
I'm building an mcp-server that reads large files, which can be time-consuming.

When using stdio as the transport, everything works well. However, when switching to sse, the server fails to work properly. Could you provide some help?

WARNING:root:Failed to validate notification: RequestResponder must be used as a context manager. 
Message was: method='notifications/cancelled' params={'requestId': 2, 'reason': 'McpError: MCP error -32001: Request timed out'} jsonrpc='2.0'

{
    "isError": true,
    "content": [
      {
        "type": "text",
        "text": "Error calling tool read_h5ad: {}"
      }
    ]
  }

sse start code

## Create application using SSE transport
def create_sse_app(port=8000):
    """
    Create application using SSE transport
    
    Parameters:
        port: Server port number
        
    Returns:
        Starlette application instance
    """
    from starlette.applications import Starlette
    from starlette.routing import Route, Mount
    from starlette.requests import Request
    from mcp.server.sse import SseServerTransport
    
    # Create SSE transport object
    sse = SseServerTransport("/messages/")

    # Define SSE handler function
    async def handle_sse(request):
        async with sse.connect_sse(
            request.scope, request.receive, request._send
        ) as streams:
            await server.run(
                streams[0], streams[1], 
                InitializationOptions(
                    server_name=f"scanpy-mcp-{MODULE}",
                    server_version="0.1.2",
                    capabilities=server.get_capabilities(
                        notification_options=NotificationOptions(),
                        experimental_capabilities={},
                    ),
                )
            )

    # Create Starlette application
    starlette_app = Starlette(
        routes=[
            Route("/sse", endpoint=handle_sse),
            Mount("/messages/", app=sse.handle_post_message),
            Route("/figures/{figure_name}", endpoint=get_figure),
        ]
    )
    
    return starlette_app

import uvicorn
app = create_sse_app(port=port)
uvicorn.run(app, host="0.0.0.0", port=port)

[aaadrain]

Hi，how to solve it .