* JavaScript

  ```js
  export default {
    async fetch(request) {
      // someHost is set up to return JSON responses
      const someHost = "https://jsonplaceholder.typicode.com";
      const url1 = someHost + "/todos/1";
      const url2 = someHost + "/todos/2";


      const responses = await Promise.all([fetch(url1), fetch(url2)]);
      const results = await Promise.all(responses.map((r) => r.json()));


      const options = {
        headers: { "content-type": "application/json;charset=UTF-8" },
      };
      return new Response(JSON.stringify(results), options);
    },
  };
  ```

* TypeScript

  ```ts
  export default {
    async fetch(request) {
      // someHost is set up to return JSON responses
      const someHost = "https://jsonplaceholder.typicode.com";
      const url1 = someHost + "/todos/1";
      const url2 = someHost + "/todos/2";


      const responses = await Promise.all([fetch(url1), fetch(url2)]);
      const results = await Promise.all(responses.map((r) => r.json()));


      const options = {
        headers: { "content-type": "application/json;charset=UTF-8" },
      };
      return new Response(JSON.stringify(results), options);
    },
  } satisfies ExportedHandler;
  ```

* Python

  ```py
  from workers import Response, fetch
  import asyncio
  import json


  async def on_fetch(request):
      # some_host is set up to return JSON responses
      some_host = "https://jsonplaceholder.typicode.com"
      url1 = some_host + "/todos/1"
      url2 = some_host + "/todos/2"


      responses = await asyncio.gather(fetch(url1), fetch(url2))
      results = await asyncio.gather(*(r.json() for r in responses))


      headers = {"content-type": "application/json;charset=UTF-8"}
      return Response.json(results, headers=headers)
  ```
