xkcd feed

worker.js

addEventListener("fetch", event => {
  event.respondWith(handleRequest(event.request))
})

async function handleRequest(request) {
  let url = 'https://xkcd.com/rss.xml'
  let match = /(&lt;img(?:[\uD800-\uDBFF][\uDC00-\uDFFF]|[^\n\uD800-\uDFFF])*? alt="((?:[\uD800-\uDBFF][\uDC00-\uDFFF]|[^\n\uD800-\uDFFF])*?)"(?:[\uD800-\uDBFF][\uDC00-\uDFFF]|[^\n\uD800-\uDFFF])*?&gt;<\/description>)/ig
  let replace = "$1&lt;p&gt;&lt;/p&gt;</description><summary>$2</summary>"

  var resp = await fetch(url)
  var body = await resp.text()

  newbody = body.replaceAll(match, replace)

  return new Response(newbody, {
      headers: {
          "content-type": "application/xml"
      }
  })
}