performRPC function
Implementation
Future<RPCMiddleWare> performRPC(
String url, Map headers, Map<String, dynamic> request) async {
Client client = new Client();
var response = await client
.post(Uri.parse(url),
headers: headers as Map<String, String>?,
body: json.encode(request['payload']))
.whenComplete(client.close);
Map<String, dynamic> body = json.decode(response.body);
// response.statusCode;
// if (response.statusCode >= 400) throw Future.error('connection error');
var newMapEntry = MapEntry('req', response.request);
body.addEntries([newMapEntry]);
return new RPCMiddleWare(body);
}