/**
* @todo use \Podlove\Http\Curl
*
* @return array
*/
public static function curl_get_header_for_url($url, $etag = NULL)
{
if (!function_exists('curl_exec')) {
return [];
}
$curl = curl_init();
if (\Podlove\Http\Curl::curl_can_follow_redirects()) {
curl_setopt($curl, CURLOPT_FOLLOWLOCATION, true);
// follow redirects
curl_setopt($curl, CURLOPT_MAXREDIRS, 5);
// maximum number of redirects
} else {
$url = \Podlove\Http\Curl::resolve_redirects($url, 5);
}
curl_setopt($curl, CURLOPT_URL, $url);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
// make curl_exec() return the result
curl_setopt($curl, CURLOPT_HEADER, true);
// header only
curl_setopt($curl, CURLOPT_NOBODY, true);
// return no body; HTTP request method: HEAD
curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, \Podlove\get_setting('website', 'ssl_verify_peer') == 'on');
// Don't check SSL certificate in order to be able to use self signed certificates
curl_setopt($curl, CURLOPT_FAILONERROR, true);
curl_setopt($curl, CURLOPT_TIMEOUT, 3);
// HEAD requests shouldn't take > 2 seconds
if ($etag) {
curl_setopt($curl, CURLOPT_HTTPHEADER, array('If-None-Match: "' . $etag . '"'));
}
curl_setopt($curl, CURLOPT_USERAGENT, \Podlove\Http\Curl::user_agent());
$response = curl_exec($curl);
$response_header = curl_getinfo($curl);
$error = curl_error($curl);
curl_close($curl);
return array('header' => $response_header, 'response' => $response, 'error' => $error);
}
