التخزين المؤقت والطلبات الشرطية

في هذا الدرس

avoid sending data the client already has.

الموضوعات المخطط لها

• Cache-Control tells caches how long to keep a response (max-age=60) or not to (no-store).
• An ETag is a version stamp for a response, for example a hash of the content.
• The client sends it back as If-None-Match. If nothing changed, the server answers 304 Not Modified with no body.
• Last-Modified with If-Modified-Since does the same using a date.
• Never cache personalized or sensitive responses in shared caches: use Cache-Control: private or no-store.