CORS errors on /oauth/token with Sentry

Knowledge Articles
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Problem statement

Now that we’ve added a custom domain, but we are getting CORS errors on /oauth/token.

Symptoms

  • CORS error on /oauth/token

Troubleshooting

  • Steps that can be taken by the user to identify and verify the problem, including relevant links to external resources

Cause

  • Sentry is adding the sentry-trace and baggage headers to XHR requests to /oauth/token, but these headers aren’t allowed, per the Access-Control-Allow-Headers response header on /oauth/token.

Solution

Update the tracePropagationTargets regex expression to exclude https://DOMAIN/oauth/token. Then, Sentry won’t add the sentry-trace and baggage headers to XHR request to /oauth/token.

Sentry Docs: Automatic Instrumentation for Browser JavaScript | Sentry Documentation

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