Fixed #36940 -- Improved ASGI script prefix path_info handling.

[KhadyotTakale]

Trac ticket number

ticket-36940

Branch description

The current ASGIRequest.__init__ uses str.removeprefix() to strip the script name from the request path to compute path_info. This is fragile because removeprefix is a pure string operation — it doesn't verify that the prefix is a proper path segment boundary.

For example, if script_name is /myapp and the path is /myapplication/page, removeprefix would incorrectly produce lication/page.

This patch replaces removeprefix with a check that ensures the script name is followed by / or is the exact path, before stripping it. This addresses the inline TODO comment.

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AI tools (Claude) were used to understand the issue and guide the approach. The code was reviewed and verified manually.

Checklist

• This PR follows the contribution guidelines.
• This PR does not disclose a security vulnerability (see vulnerability reporting).
• This PR targets the main branch.
• The commit message is written in past tense, mentions the ticket number, and ends with a period.
• I have checked the "Has patch" ticket flag in the Trac system.
• I have added or updated relevant tests.
• I have added or updated relevant docs, including release notes if applicable.
• I have attached screenshots in both light and dark modes for any UI changes.

[github-actions]

Hello! Thank you for your contribution 💪

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Welcome aboard ⛵️!

[p-r-a-v-i-n]

Hi @KhadyotTakale ,
please make sure to go through contributing docs.
Before submiting the contribution please check ticket status . docs

[jacobtylerwalls]

Thanks for the PR. A regression test is required. Please place it near the related tests in AsyncHandlerRequestTests.

[jacobtylerwalls]

Thanks for the updates. Welcome aboard! ⛵

I pushed teeny cosmetic updates to blend in with project style.