cf-feature-toggle.js

addEventListener('fetch', e => e.respondWith(handleRequest(e.request)))

async function handleRequest(request) {
  let url = new URL(request.url)
  let params = new URLSearchParams(url.search.slice(1))

  let features = {
    minify: ['html', 'css', 'js'],
    polish: ['lossy', 'lossless', 'off']
  }

  let opts = {
    scrapeShield: false,
    minify: {
      html: false,
      css: false,
      js: false
    },
    polish: 'off'
  }

  let hdrs = new Headers()

  for (const feature in features) {
    let toggle = params.get(feature)
    if (toggle) {
      feature === 'minify' ? opts[feature] = { [toggle]: true } : opts[feature] = toggle
      console.log(opts)
    }
  }

  hdrs.append('X-Feature-Settings', JSON.stringify(opts))

  let response = await fetch(request, { cf: opts })

  for (const header of response.headers) {
    hdrs.set(header[0], header[1])
  }
 
  return new Response(response.body, {
    headers: hdrs,
    status: response.status,
    statusText: response.statusText
  })
}