emin-ozata opened a new pull request, #61245:
URL: https://github.com/apache/airflow/pull/61245
### Description
Fixes an authentication failure triggered when `airflowctl auth login
--api-url` is given a base URL with a trailing slash.
#### Problem
When users copy the Airflow base URL from their browser's address bar
(which typically includes a trailing slash), the `_get_base_url()`
method concatenates it directly with path segments, creating malformed
URLs with double slashes (e.g., `http://localhost:8080//auth`),
resulting in "Method Not Allowed" errors.
#### Solution
Normalize the base URL by stripping trailing slashes before constructing
endpoint paths using `rstrip("/")` in the `_get_base_url()`
method.
#### Testing
Added test cases to verify URLs with trailing slashes are handled
correctly for both CLI and AUTH client kinds.
---
### Related Issues
- #61244
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