curl_header.php

<?php

define('COOKIE_FILE', 'cookie.txt');
define('HEADER_REGEX', '#^.*?(\r?\n){2}#msi');

$ch = curl_init();

curl_setopt_array($ch, array(
    CURLOPT_URL => $assetURL,
    CURLOPT_POST => FALSE,
    CURLOPT_HEADER => TRUE,
    CURLOPT_BINARYTRANSFER => FALSE,
    // CURLOPT_ENCODING => 'identity',
    // CURLOPT_NOBODY => TRUE,
    CURLOPT_COOKIESESSION => FALSE,
    CURLOPT_COOKIEJAR => COOKIE_FILE,
    CURLOPT_COOKIEFILE, COOKIE_FILE,
    CURLOPT_RETURNTRANSFER => TRUE
));
$assetResult = curl_exec($ch);

curl_close($ch);
unlink(COOKIE_FILE);

preg_match(HEADER_REGEX, $assetResult, $headerMatch);
$assetResult = str_replace($headerMatch[0], '', $assetResult);
$ignoreHeadersRegex = '#' . implode('|', $ignoreHeaders) . '#msi';
$headers = preg_split('#\r?\n#', $headerMatch[0]);

foreach ($headers as $header) {
  if (!preg_match($ignoreHeadersRegex, $header)) {
		//header($header);
		echo $header;
	}
}

?>