Se esse erro é pelo flutter não aceitar mais conexão http (somente https) como vi falando por aqui no fórum, como faz para arrumar isso e prosseguir com o curso? Muito dificil fazer curso desatualizado... alguma luz para não ficar parada dias esperando uma solçução?
E/flutter ( 2916): [ERROR:flutter/lib/ui/ui_dart_state.cc(186)] Unhandled Exception: Invalid argument(s): No host specified in URI http:192.168.0.15:8080/transactions E/flutter ( 2916): #0 HttpClient.openUrl (dart:http/httpimpl.dart:2425:9) E/flutter ( 2916): #1 HttpClient.openUrl (dart:http/http_impl.dart:2341:7) E/flutter ( 2916): #2 IOClient.send (package:http/src/io_client.dart:30:38) E/flutter ( 2916): #3 BaseClient.sendUnstreamed (package:http/src/baseclient.dart:93:38) E/flutter ( 2916): #4 BaseClient.get (package:http/src/base_client.dart:27:7) E/flutter ( 2916): #5 get. (package:http/http.dart:46:36) E/flutter ( 2916): #6 withClient (package:http/http.dart:164:20) E/flutter ( 2916): #7 get (package:http/http.dart:46:5) E/flutter ( 2916): #8 findAll (package:bytebank/http/webclient.dart:5:35) E/flutter ( 2916): #9 main (package:bytebank/main.dart:8:3) E/flutter ( 2916): #10 _runMainZoned.. (dart:ui/hooks.dart:140:25) E/flutter ( 2916): #11 _rootRun (dart:async/zone.dart:1354:13) E/flutter ( 2916): #12 _CustomZone.run (dart:async/zone.dart:1258:19) E/flutter ( 2916): #13 _runZoned (dart:async/zone.dart:1788:10) E/flutter ( 2916): #14 runZonedGuarded (dart:async/zone.dart:1776:12) E/flutter ( 2916): #15 _runMainZoned. (dart:ui/hooks.dart:133:5) E/flutter ( 2916): #16 _delayEntrypointInvocation. (dart:isolate-patch/isolatepatch.dart:283:19) E/flutter ( 2916): #17 RawReceivePortImpl.handleMessage (dart:isolate-patch/isolate_patch.dart:184:12) E/flutter ( 2916):