Creates a new HTTP response with a string body.
Source
Response( String body, int statusCode, {BaseRequest request, Map<String, String> headers: const <String, String>{}, bool isRedirect: false, bool persistentConnection: true, String reasonPhrase}) : this.bytes( _encodingForHeaders(headers).encode(body), statusCode, request: request, headers: headers, isRedirect: isRedirect, persistentConnection: persistentConnection, reasonPhrase: reasonPhrase);