App Check error when using emulator: "Uncaught (in promise) cancelled"

[thdoan]

Operating System

Windows 10

Browser Version

Chrome 114

Firebase SDK Version

9.22.2

Firebase SDK Product:

AppCheck, Auth, Functions, Logger

Describe your project's tooling

No tooling right now.

• firebase deploy to deploy to Firebase Hosting
• firebase emulators:start to test locally <-- ISSUE

Describe the problem

My app is working fine on production, but when I tried to run it locally this error was thrown:

I traced this error to proactive-refresh.ts:

My setup:

• Node v16.20.0
• Firebase Tools v12.3.1
• App Check via reCAPTCHA v3

Steps and code to reproduce issue

1. Follow instructions to enable App Check using reCAPTCHA v3 provider.
2. Run firebase emulators:start to start the emulator.
3. Go to http://127.0.0.1:5000/ and you should see the error in the console.

Relevant code follows...

index.html:

<!-- FirebaseUI requires namespaced SDK -->
<script src="https://www.gstatic.com/firebasejs/9.22.2/firebase-app-compat.js"></script>
<script src="https://www.gstatic.com/firebasejs/9.22.2/firebase-app-check-compat.js"></script>
<script src="https://www.gstatic.com/firebasejs/9.22.2/firebase-auth-compat.js"></script>
<script src="https://www.gstatic.com/firebasejs/9.22.2/firebase-functions-compat.js"></script>
<script src="https://www.gstatic.com/firebasejs/ui/6.0.2/firebase-ui-auth.js"></script>

Client script:

// Initialize Firebase
firebase.initializeApp({/* config */});
// Bypass App Check for local testing
self.FIREBASE_APPCHECK_DEBUG_TOKEN = true;
// Initialize App Check (refresh tokens automatically)
firebase.appCheck().activate(/* site key or provider */, true);

[google-oss-bot]

I couldn't figure out how to label this issue, so I've labeled it for a human to triage. Hang tight.

[jbalidiong]

Hi @thdoan, thanks for reaching out. I would like to reproduce this behavior you’re encountering. Would it be okay if you could provide me with an MCVE I can run locally, so I can have a better look into it.

[thdoan]

@jbalidiong thanks for offering to look into this. I'm going to close this since it's an edge case and I was able to get the errors to go away by setting up the Firebase emulator suite to authenticate locally. It seems the error only shows up when App Check fails to authenticate locally.