Age (HTTP header)
E736180
Age (HTTP header) is an HTTP response header that indicates how long, in seconds, a response has been cached by intermediate servers or proxies since it was originally generated.
Statements (46)
| Predicate | Object |
|---|---|
| instanceOf | HTTP response header field ⓘ |
| affects | cache freshness lifetime calculations ⓘ |
| appearsIn | HTTP response header section ⓘ |
| canBeCappedAt | 2147483648 ⓘ |
| category | response header ⓘ |
| computedBy |
caches
ⓘ
intermediate servers ⓘ |
| definedIn |
RFC 7234
NERFINISHED
ⓘ
RFC 9111 NERFINISHED ⓘ |
| direction | server-to-client ⓘ |
| governs | perceived freshness of cached response ⓘ |
| hasAbbreviation | Age ⓘ |
| hasExampleValue |
Age: 0
ⓘ
Age: 60 ⓘ |
| hasUnit | seconds ⓘ |
| indicates |
response has been cached for given number of seconds
ⓘ
response is freshly generated when value is 0 ⓘ |
| introducedIn | HTTP/1.1 specification NERFINISHED ⓘ |
| isCacheValidator | false ⓘ |
| isEndToEnd | true ⓘ |
| isFreshnessIndicator | true ⓘ |
| isHopByHop | false ⓘ |
| mustNotBeDecreasedBy | intermediate caches ⓘ |
| notUsedIn | HTTP requests ⓘ |
| partOf | HTTP caching mechanism ⓘ |
| protocol |
HTTP
NERFINISHED
ⓘ
HTTP/1.1 ⓘ |
| purpose |
help caches decide freshness
ⓘ
indicate how long a response has been cached ⓘ support HTTP cache revalidation logic ⓘ |
| relatedTo |
Cache-Control (HTTP header)
NERFINISHED
ⓘ
Date (HTTP header) ⓘ ETag (HTTP header) NERFINISHED ⓘ Expires (HTTP header) NERFINISHED ⓘ Last-Modified (HTTP header) NERFINISHED ⓘ |
| scope | HTTP responses only ⓘ |
| semantics |
apparent age of a cached response
ⓘ
time since the response was generated or revalidated ⓘ |
| standardizedBy |
Internet Engineering Task Force
ⓘ
surface form:
IETF
|
| status | standard header ⓘ |
| syntax | Age: delta-seconds ⓘ |
| usedBy |
CDNs
NERFINISHED
ⓘ
caches ⓘ intermediate proxies ⓘ |
| valueType |
delta-seconds
ⓘ
non-negative integer ⓘ |
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.