const url = process.env.REQUEST_URL;

let lib;
if (url.startsWith('https')) {
  lib = require('https');
} else {
  lib = require('http');
}

const request = lib.get;

let timeout;
if (process.env.REQUEST_TIMEOUT) {
  timeout = parseInt(process.env.REQUEST_TIMEOUT, 10);
}
let agent;
if (process.env.AGENT_TIMEOUT) {
  agent = new lib.Agent({
    proxyEnv: process.env,
    timeout: parseInt(process.env.AGENT_TIMEOUT, 10)
  });
}

let lookup;
if (process.env.RESOLVE_TO_LOCALHOST) {
  lookup = (hostname, options, callback) => {
    if (hostname === process.env.RESOLVE_TO_LOCALHOST) {
      console.log(`Resolving lookup for ${hostname} to 127.0.0.1`);
      return callback(null, [{ address: '127.0.0.1', family: 4 }]);
    }
    return require('dns').lookup(hostname, options, callback);
  };
}

const req = request(url, {
  timeout,
  agent,
  lookup,
}, (res) => {
  // Log the status code
  console.log(`Status Code: ${res.statusCode}`);
  console.log('Headers:', res.headers);
  res.pipe(process.stdout);
});

req.on('error', (e) => {
  console.error('Request Error', e);
});

req.on('timeout', () => {
  console.error('Request timed out');
  req.destroy();
});

req.end();