Posts tagged “cache”

• October 13, 2026 · Development

  HTTP ETags and Conditional Requests: If-None-Match and 304, If-Match and 412

  ETags serve both cache revalidation and lost-update prevention. Per RFC 9110 and 9111: strong vs weak comparison, If-None-Match and 304, If-Match and 412, and precondition evaluation order.

  httpcacheetagconditional-requests
• October 10, 2026 · Development

  HTTP Vary and Cache Keys: Reuse Rules, Vary: *, and Cache Fragmentation

  Vary adds request headers to the cache key. Per RFC 9110 and 9111: when header values match, why Vary: * forces revalidation every time, and how content negotiation splits a cache.

  httpcachevarycontent-negotiation

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