public function get_response_header($header = null)
    {
        if ($header) {
            return $this->response_headers[strtolower($header)];
        }
        return $this->response_headers;
    }
public function get_response_header($header = null)
    {
        if ($header) {
            return $this->response_headers[strtolower($header)];
        }
        return $this->response_headers;
    }
public function get_response_header ( $ header = null ) { if ( $ header ) { return $ this -> response_headers [ strtolower ( $ header ) ] ; } return $ this -> response_headers ; }
Get the HTTP response headers from the request.

@param string $header (Optional) A specific header value to return. Defaults to all headers.
@return string|array All or selected header values.
Get the HTTP response headers from the request .