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HTTP2 server push

Push static assets to a client's browser without waiting for HTML to render.

const CSS = `body { color: red; }`const HTML = `<!doctype html><html lang="en"><head>    <meta charset="utf-8">    <title>Server push test</title>    <link rel="stylesheet" href="http2_push/h2p/test.css"></head><body>    <h1>Server push test page</h1></body></html>`
async function handleRequest(request) {  // If request is for test.css, serve the raw CSS  if (/test\.css$/.test(request.url)) {    return new Response(CSS, {      headers: {        "content-type": "text/css",      },    })  }  else {    // Serve raw HTML using HTTP/2 for the CSS file    return new Response(HTML, {      headers: {        "content-type": "text/html",        Link: "</http2_push/h2p/test.css>; rel=preload; as=style",      },    })  }}
addEventListener("fetch", event => {  event.respondWith(handleRequest(event.request))})