   $this->setup_handle($url, $headers, $data, $options);    if ($options['filename'] !== false) {    $this->stream_handle = fopen($options['filename'], 'wb');   }    $this->response_data = '';   $this->response_bytes = 0;   $this->response_byte_limit = false;   if ($options['max_bytes'] !== false) {    $this->response_byte_limit = $options['max_bytes'];   }   