Respect DNS TTL and HTTP cache age
04HTTP caching must not extend the underlying DNS data’s usable lifetime.
Related RFCs and changes
“Updates” changes part of an earlier RFC. “Obsoletes” replaces it. This list shows selected related documents.
DIAGRAM§ 5.1 ↗
RFC 8484 · § 5.1EXAMPLE
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03
Reduce the remaining DNS lifetime by the age already elapsed.
Reduce the remaining DNS lifetime by the age already elapsed.
Protocol participantThreat or exceptionProtocol controlSimplified drawings · precise section references
Read the updated RFC section ↗
A client accounts for the HTTP Age value when determining remaining DNS lifetime.
- A client accounts for the HTTP Age value when determining remaining DNS lifetime.
- A cached response can be older than the moment it was received locally.
The drawing is a simplified worked example. Follow the linked RFC and its updates for implementation requirements.
Read the RFC section ↗Diagrams simplify the RFC. Read the linked sections for complete requirements.
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