/**
* Returns the request handler (Guzzle client for the moment).
* Creates and setups handler if not set.
* @return Handler
*/
public function getHandler()
{
if (static::$_handler === null) {
static::$_handler = new Handler($this->config);
static::$_handler->setUserAgent('hiart/0.x');
}
return static::$_handler;
}