router.php

<?php
declare(strict_types=1);

// Get the helix IP from the environment variables.
$helixIp = getenv('HELIXIP');

// This is a list of Helix API functions that will be proxied to the Helix.
$apiFunctions = [
  '/getStatus',
  '/getFiles',
  '/playFile',
  '/Event',
  '/getTracks',
  '/playTrack',
  '/setVolume',
  '/pickZone',
  '/getGenericSettings',
];

if (isset($_SERVER["PATH_INFO"]) && in_array($_SERVER["PATH_INFO"], $apiFunctions)) {
  // Proxy the API call to the Helix.
  $url = 'http://' . $helixIp . $_SERVER['REQUEST_URI'];
  $ch = curl_init();
  $user_agent = "Mozilla/4.0";
  curl_setopt($ch, CURLOPT_URL, $url);
  curl_setopt($ch, CURLOPT_USERAGENT, $user_agent);
  curl_setopt($ch, CURLOPT_HEADER, 0);
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
  curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
  curl_setopt($ch, CURLOPT_TIMEOUT, 120);
  $contents = curl_exec($ch);
  curl_close($ch);
  print $contents;
}
elseif ('/favicon.ico' === $_SERVER["REQUEST_URI"]) {
  // Return favicon.
  header("Content-type: image/x-icon");
  readfile('favicon.ico');
}
else {
  // Return the index.html page.
  include 'index.html';
}