A concept of Cloud Flare edge worker that is used for transferring beacons to beacon catcher server.

basic-rum-beacon-transfer-cloudflare-edge-worker.js

var beaconCatcherAddress = "https://rum.revampix.com/beacon/catcher.php"

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

async function asyncFetch(request) {
  let response = fetch(request)
    .then(
      function() {},
      function() {}
    );
      
  return response;
}

async function handle(event, request) {
  if (request.method === "OPTIONS") {
    return handleOptions(request)
  } else if (request.method === "GET" ||
             request.method === "HEAD" ||
             request.method === "POST") {
    
    //Health check bypass check
    if (request.url.indexOf('healthcheck') > -1) {
      return await fetch(craftOriginRequest(request))
    }

    let beaconRequest = craftOriginRequest(request)

    event.waitUntil(
      asyncFetch(
        beaconRequest
      )
    )
    
    //We want instant response to our visitor's browser
    let response = new Response('')
    return response
  } else {
    return new Response(null, {
      status: 405,
      statusText: "Method Not Allowed",
    })
  }
}

function craftOriginRequest(request) {
  let originalUrl = request.url

  if (originalUrl.indexOf('workers.dev') > -1) {

    // clone the URL from the old request
    let url = new URL(request.url)
    // set a new hostname on the URL
    //url.hostname = "rum.revampix.com"
    url.href = originalUrl.replace(/.+?\.workers\.dev\/?/, beaconCatcherAddress);
    // construct a new Request object for the new URL,
    // passing the old request as the initialization object.
    newRequest = new Request(url, request)

    return newRequest;
  }

  return request;
}

function handleOptions(request) {
  if (request.headers.get("Origin") !== null &&
      request.headers.get("Access-Control-Request-Method") !== null &&
      request.headers.get("Access-Control-Request-Headers") !== null) {
    // Handle CORS pre-flight request.
    let origing = "*";
    if (request.headers.get("Origin") !== null) {
      origing = request.headers.get("Origin");
    }

    return new Response(null, {
      headers: {
        "Access-Control-Allow-Origin": origing,
        "Access-Control-Allow-Methods": "GET, HEAD, POST, OPTIONS",
        "Access-Control-Allow-Headers": "X-Requested-With, Keep-Alive, content-type, access-control-allow-origin, access-control-allow-methods, access-control-allow-headers",
        "Access-Control-Max-Age" : "86400"
      }
    })
  } else {
    // Handle standard OPTIONS request.
    return new Response(null, {
      headers: {
        "Allow": "GET, HEAD, POST, OPTIONS",
      }
    })
  }
}