[BUG] tokenUrl is not generating the token and giving a 404 Not Found

[waqadArshad]

@maxxfrazer @Ascenio @hxingpax @Meherdeep @tadaspetra
Describe the bug
agora_uikit: ^0.0.4
agora_rtc_engine: ^4.2.0

I hosted https://github.com/AgoraIO-Community/agora-token-service server on Heroku and just copied the base Url of the server: https://nikah----match.herokuapp.com/ as the tokenUrl in the AgoraConnectionData constructor as given here:

final AgoraClient client = AgoraClient(
    agoraConnectionData: AgoraConnectionData(
      appId: "", //omitted for security reasons
      tokenUrl: "https://nikah----match.herokuapp.com",
      // tokenUrl: "https://nikah--match.herokuapp.com/access_token?",
      channelName: channelName,
      uid: 0,
    ),
    enabledPermission: [
      Permission.camera,
      Permission.microphone,
    ],
  );
//the commented line was my previous NodeJS server with old code and different parameters. 
//that's why I hosted this one now as the link in the original AgoraConnectionData class referred //to this server.

and got the error:

I/flutter (15044): Not Found
I/flutter (15044): Failed to generate the token : 404
W/System.err(15044): java.lang.reflect.InvocationTargetException
W/System.err(15044): 	at java.lang.reflect.Method.invoke(Native Method)
W/System.err(15044): 	at io.agora.agora_rtc_engine.AgoraRtcEnginePlugin.onMethodCall(AgoraRtcEnginePlugin.kt:124)
W/System.err(15044): 	at io.flutter.plugin.common.MethodChannel$IncomingMethodCallHandler.onMessage(MethodChannel.java:262)
W/System.err(15044): 	at io.flutter.embedding.engine.dart.DartMessenger.invokeHandler(DartMessenger.java:296)
W/System.err(15044): 	at io.flutter.embedding.engine.dart.DartMessenger.lambda$dispatchMessageToQueue$0$DartMessenger(DartMessenger.java:320)
W/System.err(15044): 	at io.flutter.embedding.engine.dart.-$$Lambda$DartMessenger$TsixYUB5E6FpKhMtCSQVHKE89gQ.run(Unknown Source:12)
W/System.err(15044): 	at android.os.Handler.handleCallback(Handler.java:938)
W/System.err(15044): 	at android.os.Handler.dispatchMessage(Handler.java:99)
W/System.err(15044): 	at android.os.Looper.loop(Looper.java:264)
W/System.err(15044): 	at android.app.ActivityThread.main(ActivityThread.java:8282)
W/System.err(15044): 	at java.lang.reflect.Method.invoke(Native Method)
W/System.err(15044): 	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:632)
W/System.err(15044): 	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1049)
W/System.err(15044): Caused by: java.lang.NullPointerException: null cannot be cast to non-null type kotlin.String
W/System.err(15044): 	at io.agora.rtc.base.RtcEngineManager.joinChannel(RtcEngine.kt:448)
W/System.err(15044): 	... 13 more
E/flutter (15044): [ERROR:flutter/lib/ui/ui_dart_state.cc(209)] Unhandled Exception: MissingPluginException(No implementation found for method joinChannel on channel agora_rtc_engine)
E/flutter (15044): #0      MethodChannel._invokeMethod (package:flutter/src/services/platform_channel.dart:175:7)
E/flutter (15044): <asynchronous suspension>
E/flutter (15044): #1      SessionController.joinVideoChannel (package:agora_uikit/controllers/session_controller.dart:404:5)
E/flutter (15044): <asynchronous suspension>
E/flutter (15044): #2      AgoraClient.initialize (package:agora_uikit/src/agora_client.dart:69:5)
E/flutter (15044): <asynchronous suspension>
E/flutter (15044): #3      _VideoCallAgoraUIKitState.initAgora (package:nikah_match/view/video_call/agoraUI_video_call.dart:54:5)
E/flutter (15044): <asynchronous suspension>
E/flutter (15044): 

What else I tried:

https://nikah----match.herokuapp.com/rtc

https://nikah----match.herokuapp.com/rtc/test/publisher/uid/0

https://nikah----match.herokuapp.com/rtc/:channelName/publisher/uid/0

https://nikah----match.herokuapp.com/rtc/$channelName/publisher/uid/0

https://nikah----match.herokuapp.com/rtc/:channelName/:role/:tokentype/:uid

To Reproduce
Steps to reproduce the behavior:

1. use the given code with the agora_uikit: ^0.0.4
2. See the console

Expected behavior
A token is generated and the call starts.

Screenshots
If applicable, add screenshots to help explain your problem (N/A).

Desktop (please complete the following information):

• OS: Windows

Smartphone (please complete the following information):

• Device: OPPO F15
• OS: Android 11

Additional context
Doctor summary (to see all details, run flutter doctor -v):
[√] Flutter (Channel stable, 2.10.3, on Microsoft Windows [Version 10.0.19044.1526], locale en-US)
[√] Android toolchain - develop for Android devices (Android SDK version 32.0.0)
[√] Chrome - develop for the web
[√] Visual Studio - develop for Windows (Visual Studio Build Tools 2019 16.11.10)
[√] Android Studio (version 2021.1)
[√] IntelliJ IDEA Community Edition (version 2021.3)
[√] VS Code (version 1.65.2)
[√] Connected device (4 available)
[√] HTTP Host Availability

• No issues found!

[maxxfrazer]

addressed in AgoraIO-Community/agora-token-service#22

@waqadArshad to save yourself time, it might be easier to use Postman, or a similar tool for checking that your token server is running properly.

[waqadArshad]

The token is being generated when I am using the link in a browser. The thing is that there is no documentation stating, how that link is being used by the Agora UI Kit. I mean which parameters are being placed where inside the link, is not documented at all.

[waqadArshad]

@maxxfrazer and I think you should at least wait for the Author's answer before closing an issue.

[maxxfrazer]

The correct URL for you and your colleague is:
"https://nikah----match.herokuapp.com"

This project is all open source, corresponding code is here:
https://github.com/AgoraIO-Community/Flutter-UIKit/blob/829db279ad14a4af6828cb522ca96b8c2a3dd9d4/lib/controllers/session_controller.dart#L631

I'd suggest modifying the local copy of that to print out the full URL that it uses, just to check. If it comes back with anything other than "https://nikah----match.herokuapp.com/rtc/test/publisher/uid/0", then we will have an issue.

This is a small dart script that uses the same code and prints the token correctly:

import 'package:http/http.dart' as http;
import 'dart:convert';

void main(List<String> arguments) {
  getToken(
    tokenUrl: "https://nikah----match.herokuapp.com",
    channelName: "test",
    uid: 0,
  );
}

Future<void> getToken({
  String? tokenUrl,
  String? channelName,
  int uid = 0,
}) async {
  final response = await http
      .get(Uri.parse('$tokenUrl/rtc/$channelName/publisher/uid/$uid'));
  if (response.statusCode == 200) {
    print(jsonDecode(response.body)['rtcToken']);
  } else {
    print(response.reasonPhrase);
    print('Failed to generate the token : ${response.statusCode}');
  }
}

[maxxfrazer]

No answer from author… closing issue again

[waqadArshad]

Yes sorry for the delayed response. I was really busy these past few days. Yes, it seems to be working just fine now.

@maxxfrazer Thanks a lot for the help. I really appreciate it.