A Request Mirror Script in PHP

RequestMirror.php

<?php

/**
 * A simple script that acts as a request mirror.
 * It will return a JSON object containing all sorts of information
 * relating to the request it received.
 */

$url = 'http://';
if (isset($_SERVER['HTTPS'])) {
    $url = 'https://';
}
$url .= "{$_SERVER['HTTP_HOST']}{$_SERVER['PHP_SELF']}";

if ($_SERVER['QUERY_STRING']) {
    $url .= "?{$_SERVER['QUERY_STRING']}";
}

$request = array(
    'body' => file_get_contents('php://input'),
    'headers' => getallheaders(),
    'origin' => $_SERVER['REMOTE_ADDR'],
    'method' => $_SERVER['REQUEST_METHOD'],
    'params' => array(
        'get' => $_GET,
        'post' => $_POST,
    ),
    'url' => $url,
);

header('Content-Type: application/json');
die(json_encode($request));