fix: net/nat retain https scheme for external

[tiendn]

Keep HTTPS scheme for security and reliability (potentially intercept and modify the response, providing you with incorrect IP information):

• Prevents man-in-the-middle attacks
• Ensures data integrity
• Follows modern security best practices
• Maintains compatibility with services that enforce HTTPS

[codspeed-hq]

CodSpeed Performance Report

Merging #13507 will not alter performance

_{Comparing tiendn:fix/retain-https-external-link (36140c4) with main (5a21bda)}

Summary

✅ 77 untouched benchmarks

[Rjected]

needs rebase i think, otherwise lgtm

[tiendn]

I've updated latest code, please check @Rjected

[Rjected]

thanks! this looks good to me