<?php
header('Content-Type: application/json');
echo json_encode([
  'AUTH' => $_SERVER['HTTP_AUTHORIZATION'] ?? '',
  'XKEY' => $_SERVER['HTTP_X_API_KEY'] ?? '',
  'IP'   => $_SERVER['REMOTE_ADDR'] ?? '',
  'UA'   => $_SERVER['HTTP_USER_AGENT'] ?? '',
], JSON_PRETTY_PRINT);