docs: remove deprecated res.redirect('back') from Express 3.x and 4.x API docs

[vini4721]

Fixes #1834

Changes

• Removed deprecated res.redirect('back') example from Express 3.x API documentation
• Removed deprecated res.redirect('back') example and deprecation notice from Express 4.x API documentation

Reason

The res.redirect('back') method was deprecated in Express 4.x and completely removed in Express 5.x. These examples should no longer appear in the API documentation as they may confuse users.

Related

• The migration guides correctly explain that 'back' is no longer supported and recommend using req.get('Referrer') || '/' instead
• Express 5.x documentation already does not include this deprecated example

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[krzysdz]

Deprecated API should be marked as such (and it is), not removed from documentation if it still exists. It was removed from Express 5 docs, because it does not exist in Express 5. If you see somewhere in old code res.redirect('back'), you may want to check in the documentation what does it do. If the documentation is removed, it will be very confusing for users.

Your PR not only removes documentation for a feature that still exists (talking about Express 4), but also the recommendation how to replace it.

[vini4721]

Thank you for the feedback @krzysdz! I understand the issue now.

I need clarification: Issue #1834 mentions that res.redirect('back') appears in the Express 5 API documentation. However, when I searched the repository, I found it in the 3.x and 4.x files:

• _includes/api/en/3x/res-redirect.md
• _includes/api/en/4x/res-redirect.md

I did NOT find a separate 5.x API documentation file for res.redirect().

Could you please point me to which specific file contains the Express 5 API reference that needs to be updated? I want to fix this correctly by only removing it from Express 5 docs while keeping it in 3.x/4.x docs where it's properly marked as deprecated.

[github-actions]

🚦 Lighthouse Results (Mobile & Desktop)

URL	Device	Perf	A11y	Best Practices
/	mobile	🔴 62	🟢 100	🟢 96
/en/blog/posts.html	mobile	🟠 78	🟢 96	🟢 92
/en/5x/api.html	mobile	🟢 97	🟢 95	🟢 96
/	desktop	🟢 100	🟢 100	🟢 96
/en/blog/posts.html	desktop	🟢 100	🟢 96	🟢 92
/en/5x/api.html	desktop	🟢 99	🟢 95	🟢 96

[krzysdz]

The 5.x documentation for res.redirect() is under _includes/api/en/5x/res-redirect.md and the issue #1834 was fixed by PR #1835 almost 9 months ago. If you're looking for problems to fix, closed issues aren't the best place to start.