apollo server 2

gistfile1.js

  app.use(
    '/graphql',
    bodyParser.json(),
    graphqlExpress(async (req, res) => {
      
      //afterware to attach the headers to current request object
      const addCookiesLink = new ApolloLink((operation, forward) => {
        return forward(operation).map(response => {
          const context = operation.getContext();
          const cookies = context.response.headers.get('set-cookie');

          if (!cookies) return response;

          const responseCookies =
            cookies instanceof Array
              ? cookies.map(Cookie.parse)
              : [Cookie.parse(cookies)];

          const casinoSession = responseCookies.find(
            cookie => cookie.key == '_casino_session'
          );

          casinoSession &&
            casinoSession.value &&
            res.cookie(casinoSession.key, casinoSession.value, {
              expires: casinoSession.expires,
              httpOnly: true
            });

          return response;
        });
      });

      const makeAPIServiceLink = () =>
        addCookiesLink.concat(
          createHttpLink({
            uri: config.API_GRAPHQL_SERVER_URL,
            credentials: 'include',
            headers: {
              cookie: req.header('Cookie') // no access to req object to send the headers
            },
            fetch
          })
        );



      const APIServiceLink = makeAPIServiceLink();

      const APIServiceSchemaDefinition = await introspectSchema(APIServiceLink);

      const APIServiceExecutableSchema = makeRemoteExecutableSchema({
        schema: APIServiceSchemaDefinition,
        link: APIServiceLink
      });


      const schema = mergeSchemas({
        schemas: [APIServiceExecutableSchema, ....],
        
      });

      return {
        schema: schema,
        tracing: true,
        cacheControl: {
          defaultMaxAge: 3500
        },
        graphiql: true,
        context: { req, res }
      };
    })
  );

  app.get('/graphiql', graphiqlExpress({ endpointURL: '/graphql' }));