Testing a Cloudflare worker's fetch(). We want to run fetch() in the background without having to wait for a response, so we can respond immediately to the initial request.

cloudflare-workers-fetch-without-waiting-via-console-log.js

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

async function fetchAndFetch(request) {
  const content = `timestamp=${Date.now()}`

  // Actually a POST request.
  console.log(content)

  // Respond.
  return new Response(`Sent a POST request with content: ${content} \n`)
}

// Monkey-patch console.log to fetch().
console.log = function() {
  fetch('https://putsreq.com/ZyjM4ubsAADQyGBDRJ08', {
    method: 'POST',
    body: JSON.stringify([...arguments])
  })
}