CompressionStream

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In this example a request is made to httpbin.org/html and the response body is compressed using gzip compression.

View this example on [Fiddle](https://fiddle.fastly.dev/fiddle/c1326776).

```js
async function app(event) {
 const req = event.request;
 const backendResponse = await fetch("https://httpbin.org/html", { backend: "my-backend" });
 if (!backendResponse.body) {
   return backendResponse;
 }
 let resp = new Response(backendResponse.body.pipeThrough(new CompressionStream("gzip")), backendResponse);
 resp.headers.set("Content-Encoding", "gzip");
 return resp;
}
addEventListener("fetch", event => event.respondWith(app(event)));
```