mattwang44 opened a new pull request, #75056:
URL: https://github.com/apache/airflow/pull/75056
Browsers scope cookies by host name and path, not by port. Two Airflow
instances served from the same host name with the same `[api] base_url` path
therefore share the `_token` cookie, and logging in to one logs you out of the
other. As suggested on the issue, this is documented rather than changed in
code.
I reproduced it on Airflow 3.4.0 with SimpleAuthManager: with both instances
on `/`, logging in to B overwrote A's `_token`, and A returned 403 and cleared
the cookie. With `base_url` paths `/a` and `/b`, both sessions stayed valid,
because Airflow scopes the cookie to the `base_url` path (`get_cookie_path()`
in `api_fastapi/app.py`; the Keycloak, AWS and FAB auth managers pass the same
path).
This adds a "Running multiple Airflow instances on the same host" section to
`run-behind-proxy.rst`, next to the existing `base_url` guidance: give each
instance its own `base_url` path, or serve each from its own host name.
closes: #17689
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