Tunnel sometimes doesn't receive a DSN in the payload

[max-wittig]

Environment

How do you use Sentry?
self-hosted 21.09.

Which SDK and version?
Angular SDK, maybe this issue belongs to the Angular SDK, not sure.

    "@sentry/angular": "^6.13.2",
    "@sentry/tracing": "^6.13.2",

Steps to Reproduce

1. Setup sentry tunnel in the Angular App, like officially described
2. Produce crash
3. Wait for user dialog
4. Observe 403 thrown by the upstream Sentry

Expected Result

I expected the payload to always include the upstream DSN. But it looks like this, when the user sees a
user feedback error page:

{}
{"type":"client_report"}
{"timestamp":1635253668.001,"discarded_events":[{"reason":"event_processor","category":"error","quantity":1}]}

What should I do as a tunnel here? Drop those events?

Actual Result

I would expect that every request includes a DSN in the first line, so that it can be parsed and forwarded to Sentry.

envelope = request.data
piece = envelope.split("\n")[0]
header = json.loads(piece)
dsn = urllib.parse.urlparse(header.get("dsn"))  # header.get("dsn") is empty, ParseResultBytes(scheme=b'', netloc=b'', path=b'', params=b'', query=b'', fragment=b'')
project_id = str(dsn.path).strip("/")
url = f"{settings.SENTRY_URL}/api/{project_id}/envelope/"
response = requests.post(url=url, data=envelope)  # this causes Sentry to throw a 403, <title>CSRF Verification Failed | Sentry</title>

In all other cases the payload looks correct:

{"event_id":"cdc681cf948044df86284138f4e0f21a","sent_at":"2021-10-26T13:07:49.262Z","sdk":{"name":"sentry.javascript.angular","version":"6.13.2"},"dsn":"https://0ef913cb946547adb7658bad4fbf96fe@localhost.com/87"}
{"type":"event","sample_rates":[{}]}
{"exception":{"values":[{"type":"Error","value":"Non-Error exception captured with keys: erro...}]}}

[AbhiPrasad]

This should be fixed by #4031, which should be available in the next release. For now you can drop these events until we get that release out.

[max-wittig]

Nice! Thanks 👍

[oystein-beaufort]

Is this something that will be released soon? :)

[AbhiPrasad]

yup as part of SDK version 6.14.0. Too see progress on when that release will be cut, monitor getsentry/publish#629. When that issue is closed/accepted, the release will pushed to npm.

[AbhiPrasad]

Release has been cut https://www.npmjs.com/package/@sentry/browser/v/6.14.0 :)