<?php
header('Content-Type: application/json');
$info = [
    'server_name' => $_SERVER['SERVER_NAME'] ?? '',
    'http_host'   => $_SERVER['HTTP_HOST'] ?? '',
    'document_root' => $_SERVER['DOCUMENT_ROOT'] ?? '',
    'script_uri'  => $_SERVER['SCRIPT_URI'] ?? '',
    'script_url'  => (isset($_SERVER['HTTPS'])&&$_SERVER['HTTPS']==='on'?'https':'http').'://'.($_SERVER['HTTP_HOST']??'').($_SERVER['SCRIPT_NAME']??''),
    'php_self'    => $_SERVER['PHP_SELF'] ?? '',
    'server_addr' => $_SERVER['SERVER_ADDR'] ?? '',
];
echo json_encode($info, JSON_PRETTY_PRINT | JSON_UNESCAPED_SLASHES);
?>