/**
* Perform a HEAD request to the specified URL.
*
* Note :
*
* Since the MediaFire checker works by parsing the "Location" header, redirect following
* _must_ be disabled. This can become a problem on servers where WP is forced to fall back
* on using WP_Http_Fopen which ignores the 'redirection' flag. WP_Http_Fsockopen would work,
* but it has the lowest priority of all transports.
*
* Alas, there is no way to reliably influence which transport is chosen - the WP_Http::_getTransport
* function caches the available choices, so plugins can disable individual transports only during
* its first run. Therefore, we must pick the best transport manually.
*
* @param string $url
* @return array|WP_Error
*/
function head($url)
{
//Only consider transports that allow redirection to be disabled.
$args = array();
if (class_exists('WP_Http_ExtHttp') && true === WP_Http_ExtHttp::test($args)) {
$transport = new WP_Http_ExtHttp();
} else {
if (class_exists('WP_Http_Curl') && true === WP_Http_Curl::test($args)) {
$transport = new WP_Http_Curl();
} else {
if (class_exists('WP_Http_Curl') && true === WP_Http_Fsockopen::test($args)) {
$transport = new WP_Http_Fsockopen();
} else {
return new WP_Error('no_suitable_transport', "No suitable HTTP transport found. Please upgrade to a more recent version of PHP or install the CURL extension.");
}
}
}
$conf = blc_get_configuration();
$args = array('timeout' => $conf->options['timeout'], 'redirection' => 0, 'method' => 'HEAD');
return $transport->request($url, $args);
}
