public function getHeaderValue($header, $glue = '')
    {
        if ($header = $this->response->getHeader($header, true)) {
            if (is_array($header)) {
                return implode($glue, $header);
            }
        }

        return $header;
    }
public function getHeaderValue($header, $glue = '')
    {
        if ($header = $this->response->getHeader($header, true)) {
            if (is_array($header)) {
                return implode($glue, $header);
            }
        }

        return $header;
    }
public function getHeaderValue ( $ header , $ glue = '' ) { if ( $ header = $ this -> response -> getHeader ( $ header , true ) ) { if ( is_array ( $ header ) ) { return implode ( $ glue , $ header ) ; } } return $ header ; }
return a scalar value of \Guzzle\Http\Message\Header type

@param string $header Header name
@param string $glue   Separator (default='')

@return string
return a scalar value of \ Guzzle \ Http \ Message \ Header type