Simple ajax cache warmer based on sitemap.xml

cache-warmer.js

/**
 * This cache warmer uses everything located in the sitemap.xml
 * of the current opened website. Just copy and paste all of this
 * in the browser console while the target website is opened.
 */​
async function crawl() {
  let urls = [];
  async function getUrls() {
    await fetch(`${window.location.origin}/sitemap.xml`).then(response => response.text())
      .then(str => new window.DOMParser().parseFromString(str.trimStart(), "text/xml"))
      .then(data => {
        let otherSitemaps = Array.from(data.querySelectorAll('sitemap loc')).map(n => n.textContent);
        return otherSitemaps.reduce( async (previousPromise, url) => {
          await previousPromise;
          return fetch(url).then(ress => ress.text())
          .then(strr => new window.DOMParser().parseFromString(strr.trimStart(), "text/xml"))
          .then(subdata => {
            urls = urls.concat(Array.from(subdata.querySelectorAll('url loc')).map(n => n.textContent));
            urls = urls.concat(Array.from(subdata.querySelectorAll('url [hreflang]')).map(n => n.getAttribute('href')));
          });
        }, Promise.resolve());
      });
  }
  function removeStaticAssets(urls) {
    const staticExtensions = ['.js', '.css', '.png', '.jpg', '.jpeg', '.gif', '.svg', '.webp', '.png', '.bmp', '.avif', '.mp4', '.mov', '.pdf'];
    const filteredUrls = urls.filter(url => {
      const extension = url.substring(url.lastIndexOf('.')).toLowerCase();
      return !staticExtensions.includes(extension);
    });
    return filteredUrls;
  }
  await getUrls();
  // remove duplicates
  urls = [...new Set(urls)];
  // remove static assetes
  urls = removeStaticAssets(urls);
  urls.reduce( async (previousPromise, url) => {
    await previousPromise;
    return fetch(url);
  }, Promise.resolve());
}
crawl();