Canonical redirect on `/page/1/` forces HTTP instead of HTTPS behind proxy/CDN

[igor2021]

When WordPress handles canonical redirects for paginated archives, it forces /page/1/ to /.
The problem: if the site is running behind a proxy/CDN (e.g. Cloudflare), WordPress sometimes issues the redirect to http:// instead of preserving the original https:// scheme.

This causes unnecessary redirect chains and breaks SEO performance.

Steps to reproduce:

1. Open https://example.com/category/page/1/
2. WordPress redirects to http://example.com/category/
3. Proxy/CDN enforces HTTPS → results in 2 or 3 chained redirects.

Expected result:
WordPress should preserve the HTTPS scheme when performing canonical redirects (or allow disabling /page/1/ → / canonicalization via a filter/setting).

Notes:
This has been discussed by many site owners using HTTPS-only setups.
A core fix or an option in Settings would prevent extra redirect hops.