async function gatherResponse(response) {
                        const { headers } = response;
                        const contentType = headers.get('content-type') || '';
                        if (contentType.includes('application/json')) {
                          return JSON.stringify(await response.json());
                        } else if (contentType.includes('application/text')) {
                          return response.text();
                        } else if (contentType.includes('text/html')) {
                          return response.text();
                        } else {
                          return response.text();
                        }
                      }
                      
                      async function handleRequest() {
                        const init = {
                          headers: {
                            'content-type': type,
                          },
                        };
                        const responses = await Promise.all([fetch(url1, init), fetch(url2, init)]);
                        const results = await Promise.all([gatherResponse(responses[0]), gatherResponse(responses[1])]);
                        return new Response(results.join(), init);
                      }
                      
                      addEventListener('fetch', event => {
                        return event.respondWith(handleRequest());
                      });