src/GuzzleHelper.php
public function useHeaders($name)
    {
        $headers = $this->httpHeaders->getHeaders($name);

        $this->mergeOptions(array('headers' => $headers));
    }
public function useHeaders($name)
    {
        $headers = $this->httpHeaders->getHeaders($name);

        $this->mergeOptions(array('headers' => $headers));
    }
Use HTTP headers

@param string name