workers_proxy.js

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

async function handleRequest(request) {

  const url = request.url + (request.url.indexOf('?')===-1 ? '?' : '&')
  
  const hook1Response = await fetch(url + 'workers_proxy_get=1', request)
  let api = await hook1Response.text()

  if(!api.match(/^https?:\/\/[^\s]+$/))
    return new Response(api, hook1Response);

  let apiResponse = await fetch(api)
  apiResponse = await apiResponse.text()

  let formData = new FormData()
  formData.set('html', apiResponse)

  return fetch(url + 'workers_proxy_response=1',
           { headers: request.headers, method:"POST", body:formData })
}