/**
* Performs http GET request.
* @param string $url
* @throws \LogicException when no http client attached to provider.
* @throws \Exception when any http client exception occuried.
* @return string
*/
protected function httpRequest($url)
{
if (!($http = $this->getHttpClient())) {
throw new \LogicException('No http client defined.');
}
return $this->httpClient->get($url);
}
