Set Header Commands in Php

    header('HTTP/1.1 200 OK');

    if (isset($_GET['cors'])) {
        header('Access-Control-Allow-Origin: *');
        header('Access-Control-Allow-Methods: GET, POST');
    }

    // Indicate a file download
    header('Content-Description: File Transfer');
    header('Content-Type: application/octet-stream');
    header('Content-Disposition: attachment; filename=random.dat');
    header('Content-Transfer-Encoding: binary');

    // Cache settings: never cache this request
    header('Cache-Control: no-store, no-cache, must-revalidate, max-age=0, s-maxage=0');
    header('Cache-Control: post-check=0, pre-check=0', false);
    header('Pragma: no-cache');

// Disable Compression
@ini_set('zlib.output_compression', 'Off');
@ini_set('output_buffering', 'Off');
@ini_set('output_handler', '');