Method __call__

dash/backends/_fastapi.py:208–254

(self, scope: Scope, receive: Receive, send: Send)

        await response(scope, receive, send)

    async def __call__(self, scope: Scope, receive: Receive, send: Send) -> None:
        # Handle lifespan events (startup/shutdown)

        if scope["type"] == "lifespan":
            try:
                dash_app = get_app()
                dash_app.backend._setup_catchall()
            except Exception:  # pylint: disable=broad-exception-caught
                traceback.print_exc()
            await self._initialize_dev_tools()
            await self.app(scope, receive, send)
            return

        # Non-HTTP/WebSocket scopes pass through
        if scope["type"] != "http":
            await self.app(scope, receive, send)
            return

        # Non-Dash routes pass through to avoid consuming body stream
        path = scope["path"]
        prefix = self.dash_app.config.routes_pathname_prefix
        dash_prefix = prefix.rstrip("/") + "/_dash-"
        if (
            not path.startswith(dash_prefix)
            and path != prefix
            and path != prefix.rstrip("/")
        ):
            await self.app(scope, receive, send)
            return

        # HTTP request handling
        request = Request(scope, receive=receive)
        token = set_current_request(request)

        try:
            await self._setup_timing(request)
            await self._run_before_hooks()

            await self.app(scope, receive, send)

            await self._run_after_hooks()
            self._finalize_timing(request)

        except Exception as e:  # pylint: disable=W0718
            await self._handle_error(e, scope, receive, send)
        finally:
            reset_current_request(token)


class FastAPIDashServer(BaseDashServer[FastAPI]):