(
              req: FastifyRequest<IncomingMessage>,
              reply: FastifyReply<OutgoingMessage>,
              done: () => void,
            ) => {
              // Note: if you enable playground in production and expect to be able to see your
              // schema, you'll need to manually specify `introspection: true` in the
              // ApolloServer constructor; by default, the introspection query is only
              // enabled in dev.
              if (this.playgroundOptions && req.req.method === 'GET') {
                // perform more expensive content-type check only if necessary
                const accept = (req as any).accepts() as Accepts;
                const types = accept.types() as string[];
                const prefersHTML =
                  types.find(
                    (x: string) =>
                      x === 'text/html' || x === 'application/json',
                  ) === 'text/html';

                if (prefersHTML) {
                  const playgroundRenderPageOptions: PlaygroundRenderPageOptions = {
                    endpoint: this.graphqlPath,
                    subscriptionEndpoint: this.subscriptionsPath,
                    ...this.playgroundOptions,
                  };
                  reply.type('text/html');
                  const playground = renderPlaygroundPage(
                    playgroundRenderPageOptions,
                  );
                  reply.send(playground);
                  return;
                }
              }
              done();
            },

  return async (
    request: FastifyRequest<IncomingMessage>,
    reply: FastifyReply<OutgoingMessage>,
  ) => {
    try {
      const { graphqlResponse, responseInit } = await runHttpQuery(
        [request, reply],
        {
          method: request.req.method as string,
          options,
          query: request.req.method === 'POST' ? request.body : request.query,
          request: convertNodeHttpToRequest(request.raw),
        },
      );

      if (responseInit.headers) {
        for (const [name, value] of Object.entries<string>(
          responseInit.headers,
        )) {
          reply.header(name, value);
        }
      }
      reply.serializer((payload: string) => payload);
      reply.send(graphqlResponse);
    } catch (error) {
      if ('HttpQueryError' !== error.name) {
        throw error;
      }

      if (error.headers) {
        Object.keys(error.headers).forEach(header => {
          reply.header(header, error.headers[header]);
        });
      }

      reply.code(error.statusCode);
      reply.serializer((payload: string) => payload);
      reply.send(error.message);
    }
  };

      .catch(error => {
        if (error.status && error.expose) reply.status(error.status);

        throw formatApolloErrors([error], {
          formatter: server.requestOptions.formatError,
          debug: server.requestOptions.debug,
        });
      });

 Object.keys(error.headers).forEach(header => {
   reply.header(header, error.headers[header]);
 });