AI junk

[ameerhmz]

What does this PR do?

Fixes #6093 where IPv6 addresses (e.g. [::1]:8080 or http://[::1]:8000/) were parsed incorrectly using .partition(":"), causing string splits on colons inside IPv6 host brackets.

Root Cause

1. In src/flask/app.py: server_name.partition(":") split "[::1]:8080" into sn_host = "[", sn_port = ":1]:8080".
2. In src/flask/testing.py: ctx.request.host.partition(":")[0] returned "[" instead of normalized IPv6 host "::1".

Solution

1. Updated src/flask/app.py SERVER_NAME parsing to check for "]:" or rpartition(":") to extract IPv6 host and port correctly.
2. Updated src/flask/testing.py session_transaction cookie host parsing to handle IPv6 bracketed hosts.
3. Added test case in tests/test_basic.py test_run_from_config for [::1]:8080.
4. Added test_session_transaction_ipv6 in tests/test_testing.py.

• This PR fixes IPv6 addresses parsed incorrectly because of .partition(":")? #6093.
• Included unit tests.

[davidism]

https://palletsprojects.com/contributing/llm-ai