updown.io status page proxy for cf workers

updown-proxy.js

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

async function handleRequest(request) {
    var whitelist = [
      "/rik1",
      // etc
    ]

    var url = new URL(request.url);
    url.hostname = "updown.io"
    if (url.pathname == "/" || url.pathname == "")
    {
      url.pathname = "/p/xxxxx" + url.pathname
    }
    else if (!whitelist.includes(url.pathname))
    {
      return new Response(
        JSON.stringify(
          {
            code: '404 Not Found',
            message: 'Page was not found. I am too lazy to write HTML for this Worker.',
          },
          null,
          2,
        ),
        {
          status: 404,
          headers: {
            'Content-Type': 'application/json',
          },
        },
      ) 
    }
    return fetch(url, request)
}