Response(int statusCode, Map<String, dynamic> headers, body)

The default constructor.

There exist convenience constructors for common response status codes and you should prefer to use those.

Source

Response(int statusCode, Map<String, dynamic> headers, dynamic body) {
  this.body = body;
  this.headers = new LowercaseMap.fromMap(headers ?? {});
  this.statusCode = statusCode;
}