Browser Cache Blocking App Updates

1. Cache-Control header allows long expiry
2. File hashes not changing between builds
3. Browser cache not cleared on new deployment
4. CDN caching old assets
5. Service worker caching old files

Configure cache headers in server:

// Cache busting with file hashes in Vite (default)
// main.abc123.js - changes on build

// HTML should not cache
Cache-Control: no-cache, must-revalidate

// JS/CSS can cache long
Cache-Control: public, max-age=31536000, immutable

Or add version query: ?v=1.0.0 to force reload.