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Fix duplicated 'http.response.start' event error during client session disconnection #203

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Fix duplicated 'http.response.start' event error during client session disconnection #203

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8 changes: 7 additions & 1 deletion fastapi_mcp/server.py
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Original file line number Diff line number Diff line change
Expand Up @@ -3,7 +3,7 @@
from typing import Dict, Optional, Any, List, Union, Callable, Awaitable, Iterable, Literal, Sequence
from typing_extensions import Annotated, Doc

from fastapi import FastAPI, Request, APIRouter, params
from fastapi import FastAPI, Request, APIRouter, params, Response
from fastapi.openapi.utils import get_openapi
from mcp.server.lowlevel.server import Server
import mcp.types as types
Expand All @@ -18,6 +18,11 @@
logger = logging.getLogger(__name__)


class VoidResponse(Response):
async def __call__(self, scope, receive, send) -> None:
pass


class LowlevelMCPServer(Server):
def call_tool(self):
"""
Expand Down Expand Up @@ -214,6 +219,7 @@ async def handle_mcp_connection(request: Request):
self.server.create_initialization_options(notification_options=None, experimental_capabilities={}),
raise_exceptions=False,
)
return VoidResponse()

def _register_mcp_messages_endpoint_sse(
self,
Expand Down