public static function getRequestHeaderList()
{
if (!empty(self::$headers)) {
return self::$headers;
}
if (function_exists('apache_request_headers')) {
self::$headers = apache_request_headers();
} else {
foreach ($_SERVER as $key => $value) {
if (substr($key, 0, 5) == "HTTP_") {
$name = self::extractHeader($key, "_", 5);
self::$headers[$name] = $value;
}
}
}
return self::$headers;
}
