Cloudflare workers script to enable edge-cache. Use Official cloudflare wordpress pulgin for auto cache purge management

cloudflare-worker-edge-cache.js

// Stop CF edge from caching your site when specific wordpress cookies are present
// script found in https://www.mmaton.com/2018/07/02/cloudflare-cache-anonymous-requests/

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

async function noCacheOnCookie(request) {
  // Determine which group this request is in.
  const cookie = request.headers.get('Cookie')
  // Edge Cache for 1 month
  const cacheSeconds = 2592000
  if (cookie 
    && (
      cookie.includes(`wordpress_logged`)
      || cookie.includes(`comment_`)
      || cookie.includes(`wordpress_sec`)
      || cookie.includes(`woocommerce_`)
    )) {
    const bustedRequest = new Request(request, { cf: { cacheTtl: -1 } })
    const response = await fetch(bustedRequest)

    const newHeaders = new Headers(response.headers)
    newHeaders.append('wp-cache-busted', `true`)
    return new Response(response.body, {
      status: response.status,
      statusText: response.statusText,
      headers: newHeaders
    })
  } else {
    return fetch(new Request(request, { cf: { cacheTtl: cacheSeconds } }))
  }
}