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Fundamentals · Hard · Free

Explain Cache-Control, ETag, and conditional GET.

FresherFundamentalsComputer Networks
Model answer

HTTP caching

  • Cache-Control: max-age, no-store for sensitive data.
  • ETag: server fingerprint of representation.
  • Conditional GET: If-None-Match → 304 saves bandwidth.
text
GET /api/profile
If-None-Match: "abc123"
→ 304 Not Modified (use local cache)
CDN caches respect Cache-Control—stale HTML is a common bug.