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.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Age (HTTP header) canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T8486755 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: Age (HTTP header) Context triple: [Date (HTTP header), relatedTo, Age (HTTP header)]
-
A.
Authentication Header
Authentication Header is an IPsec protocol that provides connectionless integrity and data origin authentication for IP packets, optionally protecting against replay attacks.
-
B.
RFC 7232
RFC 7232 is an HTTP/1.1 specification that defines conditional request mechanisms using validators like ETags and Last-Modified to support efficient caching and concurrency control on the web.
-
C.
Accept-Encoding
Accept-Encoding is an HTTP request header that tells the server which content-encoding algorithms (like gzip or deflate) the client can handle so the server can choose an appropriate compression method.
-
D.
Content-Range header field
The Content-Range header field is an HTTP response header used to indicate the specific byte range of a resource being returned, typically in support of partial content delivery and resumable downloads.
-
E.
HTTP
HTTP (Hypertext Transfer Protocol) is the foundational application-layer protocol used for transmitting web pages and other resources across the World Wide Web.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: Age (HTTP header) Target entity description: 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.
-
A.
Authentication Header
Authentication Header is an IPsec protocol that provides connectionless integrity and data origin authentication for IP packets, optionally protecting against replay attacks.
-
B.
RFC 7232
RFC 7232 is an HTTP/1.1 specification that defines conditional request mechanisms using validators like ETags and Last-Modified to support efficient caching and concurrency control on the web.
-
C.
Accept-Encoding
Accept-Encoding is an HTTP request header that tells the server which content-encoding algorithms (like gzip or deflate) the client can handle so the server can choose an appropriate compression method.
-
D.
Content-Range header field
The Content-Range header field is an HTTP response header used to indicate the specific byte range of a resource being returned, typically in support of partial content delivery and resumable downloads.
-
E.
HTTP
HTTP (Hypertext Transfer Protocol) is the foundational application-layer protocol used for transmitting web pages and other resources across the World Wide Web.
- F. None of above. chosen
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
ⓘ
RFC 9111 ⓘ |
| 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
ⓘ
linked to:
HTTP/1.1
|
| isCacheValidator | false ⓘ |
| isEndToEnd | true ⓘ |
| isFreshnessIndicator | true ⓘ |
| isHopByHop | false ⓘ |
| mustNotBeDecreasedBy | intermediate caches ⓘ |
| notUsedIn | HTTP requests ⓘ |
| partOf | HTTP caching mechanism ⓘ |
| protocol |
HTTP
ⓘ
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)
ⓘ
linked to:
HTTP Caching
Date (HTTP header) ⓘ ETag (HTTP header) ⓘ
linked to:
RFC 7232
Expires (HTTP header) ⓘ Last-Modified (HTTP header) ⓘ |
| scope | HTTP responses only ⓘ |
| semantics |
apparent age of a cached response
ⓘ
time since the response was generated or revalidated ⓘ |
| standardizedBy |
IETF
ⓘ
linked to:
Internet Engineering Task Force
|
| status | standard header ⓘ |
| syntax | Age: delta-seconds ⓘ |
| usedBy |
CDNs
ⓘ
linked to:
Content delivery network
caches ⓘ intermediate proxies ⓘ |
| valueType |
delta-seconds
ⓘ
non-negative integer ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: Age (HTTP header) Description of subject: 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.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.