/**
* @param string $identifier
* @param string $strategy
* @param string $locale
* @return string
*/
protected function getResponseFromApi($identifier, $strategy, $locale = 'en')
{
$url = sprintf('https://www.googleapis.com/pagespeedonline/v2/runPagespeed?screenshot=true&url=%s&strategy=%s&locale=%s&key=%s', rawurlencode($identifier), $strategy, $locale, $this->configuration->getKey());
return $this->apiCall($url);
}
