feat: add cache control headers for static assets in .htaccess

[devaraj3]

What changed

• Added a Cache-Control: public, max-age=31536000, immutable header for .js and .css files in public/.htaccess, alongside the existing rewrite rules (untouched)

Why

• PageSpeed Insights flagged only a 7-day cache lifetime on hashed static assets. Since Vite gives every build's JS/CSS a unique content hash in the filename, a new deploy never reuses an old filename — so it's safe to cache these for a full year. Free performance for returning visitors, zero risk of serving stale content.
• Scoped to only .js/.css — index.html, viewer.html, the guide page, robots.txt, sitemap.xml, and llms.txt are deliberately untouched, since those aren't hashed and need to stay revalidated normally.

Validation

• After deploy, run: curl -sI https://cadviewer.xyz/assets/<some-hashed-file>.js | grep -i cache-control and confirm it shows the new header
• Spot-check a few page navigations live to confirm nothing broke

Notes

• Header-only change, no rewrite logic touched — low risk

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Actions	Updated (UTC)
cad-viewer	Ready	Preview	Aug 7, 2026 7:27am