PHP Script to enable CORS for GET methods

cors.php

<?php
$ch = curl_init();

if (strcmp($_SERVER["REQUEST_METHOD"], "GET") == 0) {
    curl_setopt($ch, CURLOPT_URL, $_REQUEST["url"]);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

    $server_output = curl_exec ($ch);
    $contentType = curl_getinfo($ch, CURLINFO_CONTENT_TYPE);

    curl_close ($ch);

    header("Content-Type: " . $contentType);
    header("Access-Control-Allow-Origin: *");
    echo($server_output);
} else {
    http_response_code(400);
}
?>