Close server session after handle stateless request (modelcontextprotocol#1116)

Author: hopeful0

src/mcp/server/streamable_http.py

@@ -612,15 +612,15 @@ async def _handle_delete_request(self, request: Request, send: Send) -> None:
         if not await self._validate_request_headers(request, send):
             return
 
-        await self._terminate_session()
+        await self.terminate()
 
         response = self._create_json_response(
             None,
             HTTPStatus.OK,
         )
         await response(request.scope, request.receive, send)
 
-    async def _terminate_session(self) -> None:
+    async def terminate(self) -> None:
         """Terminate the current session, closing all streams.
 
         Once terminated, all requests with this session ID will receive 404 Not Found.

src/mcp/server/streamable_http_manager.py

@@ -190,6 +190,9 @@ async def run_stateless_server(*, task_status: TaskStatus[None] = anyio.TASK_STA
         # Handle the HTTP request and return the response
         await http_transport.handle_request(scope, receive, send)
 
+        # Terminate the transport after the request is handled
+        await http_transport.terminate()
+
     async def _handle_stateful_request(
         self,
         scope: Scope,