gh-67693: Fix urlunparse() and urlunsplit() for URIs with path starting with multiple slashes and no authority

[serhiy-storchaka]

Based on #15297.

Co-authored-by: Ashwin Ramaswami [email protected]

• Issue: gh-78457

• Issue: gh-67693

[serhiy-storchaka]

It fixes also more serious security issue #67693.

[miss-islington-app[bot]]

Thanks @serhiy-storchaka for the PR 🌮🎉.. I'm working now to backport this PR to: 3.8, 3.9, 3.10, 3.11, 3.12, 3.13. 🐍🍒⛏🤖

[bedevere-app[bot]]

GH-119023 is a backport of this pull request to the 3.13 branch.

[miss-islington-app[bot]]

Sorry, @serhiy-storchaka, I could not cleanly backport this to 3.11 due to a conflict. Please backport using cherry_picker on command line.

cherry_picker e237b25a4fa5626fcd1b1848aa03f725f892e40e 3.11

[bedevere-app[bot]]

GH-119024 is a backport of this pull request to the 3.12 branch.

[miss-islington-app[bot]]

Sorry, @serhiy-storchaka, I could not cleanly backport this to 3.10 due to a conflict. Please backport using cherry_picker on command line.

cherry_picker e237b25a4fa5626fcd1b1848aa03f725f892e40e 3.10

[miss-islington-app[bot]]

Sorry, @serhiy-storchaka, I could not cleanly backport this to 3.9 due to a conflict. Please backport using cherry_picker on command line.

cherry_picker e237b25a4fa5626fcd1b1848aa03f725f892e40e 3.9

[miss-islington-app[bot]]

Sorry, @serhiy-storchaka, I could not cleanly backport this to 3.8 due to a conflict. Please backport using cherry_picker on command line.

cherry_picker e237b25a4fa5626fcd1b1848aa03f725f892e40e 3.8

[bedevere-app[bot]]

GH-119025 is a backport of this pull request to the 3.11 branch.

[bedevere-app[bot]]

GH-119026 is a backport of this pull request to the 3.10 branch.

[bedevere-app[bot]]

GH-119027 is a backport of this pull request to the 3.9 branch.

[bedevere-app[bot]]

GH-119028 is a backport of this pull request to the 3.8 branch.