proxyman ad-hoc scripted proxy.js

const suffix_length = ".l.jfjf.dk".length;

async function onRequest(context, url, request) {  
  const [fake_host, raw_port] = request.host.slice(0, -suffix_length).split("__");
  
  let port = Number(raw_port);
  
  if (!port || isNaN(port)) {
    port = 443;
  }
  
  const host = fake_host.replaceAll("_", ".");

  request.host = host;
  request.port = port;
  request.scheme = port === 443 ? "https" : "http";

  return request;
}