file_link_dns_prefetch.sjs

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"use strict";

function handleRequest(request, response) {

  // write to raw socket

  response.seizePower();

  let body = `<!DOCTYPE html>

      <html>

      <head>

      <link rel="dns-prefetch" href="https://example.org">

      </head>

      <body>

      <h1>Test rel=dns-prefetch<h1>

      <a href="https://www.mozilla.org"> Test link </a>

      </body>

      </html>`;

  response.write("HTTP/1.1 200 OK\r\n");

  response.write("Content-Type: text/html;charset=utf-8\r\n");

  response.write("Cache-Control: no-cache\r\n");

  response.write(`Content-Length: ${body.length}\r\n`);

  response.write("\r\n");

  response.write(body);

  response.finish();