/**
* Sets custom values for additional request parameters.
*
* @param string $key Parameter name.
* @param mixed $value Parameter value. If not specified, default value null is set.
*/
public static function setParam($key, $value = null)
{
if ($value === null && is_array($key)) {
self::$params = $key;
} else {
self::$params[$key] = $value;
}
}
