reverse-proxy

/** 
 * This service worker retrieves another site/page when a specific path is accessed
*/


const LIVE_DOMAIN = 'www.domain.com'
const PROXY_FROM_DOMAIN = 'blog.domain.com'
const SUBDIR_PATH = '/blog'

// Optional additional proxy path, helpful for resources like /images
const ADDITIONAL_PATH = '/resources'

addEventListener("fetch", event => {
    var f_url = new URL(event.request.url);
    if (f_url.pathname.startsWith(SUBDIR_PATH)||f_url.pathname.startsWith (ADDITIONAL_PATH)) {
    handleSubdir(event, f_url);
    event.respondWith(handleSubdir(event.request));
  } else {
    return;
  }
});

async function handleSubdir(request) {
    var trueSourceURL = new URL(request.url);
    trueSourceURL.hostname = PROXY_FROM_DOMAIN;
    return fetch(trueSourceURL, request, { 
      cf: { 
        resolveOverride: 'LIVE_DOMAIN' 
      },
      // Additional header to allow httpauth pass-through
      headers: {
        'Access-Control-Allow-Headers': 'x-requested-with, accept, authorization'
      },
    })
}