HTTP Alternative Services specification
E242257
The HTTP Alternative Services specification is an IETF standard that defines a mechanism for HTTP servers to advertise alternative network endpoints or protocols that clients can use to access the same resources more efficiently or reliably.
All labels observed (3)
| Label | Occurrences |
|---|---|
| ALTSVC HTTP/3 frame | 1 |
| Alt-Svc HTTP header field | 1 |
| HTTP Alternative Services specification canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T2187942 — 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: HTTP Alternative Services specification Context triple: [HTTP Working Group, responsibleFor, HTTP Alternative Services specification]
-
A.
ALPN (Application-Layer Protocol Negotiation)
ALPN (Application-Layer Protocol Negotiation) is a TLS extension that allows clients and servers to agree on which application-layer protocol (such as HTTP/2 or SPDY) to use over a secure connection during the TLS handshake.
-
B.
HTTP/2
HTTP/2 is a major revision of the Hypertext Transfer Protocol that introduced features like multiplexing, header compression, and server push to significantly improve web performance over HTTP/1.1.
-
C.
RFC 7540
RFC 7540 is the Internet Engineering Task Force (IETF) standard that defines HTTP/2, the major revision of the Hypertext Transfer Protocol designed to improve web performance and efficiency.
-
D.
HTTP/3
HTTP/3 is the third major version of the Hypertext Transfer Protocol, built on the QUIC transport protocol to provide faster, more reliable, and secure web communication.
-
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: HTTP Alternative Services specification Target entity description: The HTTP Alternative Services specification is an IETF standard that defines a mechanism for HTTP servers to advertise alternative network endpoints or protocols that clients can use to access the same resources more efficiently or reliably.
-
A.
ALPN (Application-Layer Protocol Negotiation)
ALPN (Application-Layer Protocol Negotiation) is a TLS extension that allows clients and servers to agree on which application-layer protocol (such as HTTP/2 or SPDY) to use over a secure connection during the TLS handshake.
-
B.
HTTP/2
HTTP/2 is a major revision of the Hypertext Transfer Protocol that introduced features like multiplexing, header compression, and server push to significantly improve web performance over HTTP/1.1.
-
C.
RFC 7540
RFC 7540 is the Internet Engineering Task Force (IETF) standard that defines HTTP/2, the major revision of the Hypertext Transfer Protocol designed to improve web performance and efficiency.
-
D.
HTTP/3
HTTP/3 is the third major version of the Hypertext Transfer Protocol, built on the QUIC transport protocol to provide faster, more reliable, and secure web communication.
-
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 (45)
| Predicate | Object |
|---|---|
| instanceOf |
HTTP specification
ⓘ
IETF standard ⓘ internet standard document ⓘ |
| addresses |
privacy considerations for alternative services discovery
ⓘ
security considerations for alternative services discovery ⓘ |
| allows |
servers to advertise alternative network endpoints
ⓘ
servers to advertise alternative protocols ⓘ |
| appliesTo |
HTTP/1.1
ⓘ
HTTP/2 ⓘ HTTP/3 ⓘ |
| audience |
CDN and reverse proxy operators
ⓘ
HTTP client implementers ⓘ HTTP server implementers ⓘ |
| category |
HTTP extension
ⓘ
transport layer optimization ⓘ web performance ⓘ |
| defines |
ALTSVC HTTP/2 frame
ⓘ
HTTP Alternative Services specification self-linksurface differs ⓘ
surface form:
ALTSVC HTTP/3 frame
HTTP Alternative Services specification self-linksurface differs ⓘ
surface form:
Alt-Svc HTTP header field
ORIGIN HTTP/2 frame ⓘ mechanism for HTTP servers to advertise alternative services ⓘ |
| goal |
enable seamless migration between origins or endpoints
ⓘ
enable use of more efficient protocols without changing URLs ⓘ improve performance of HTTP connections ⓘ improve reliability of HTTP connections ⓘ |
| mechanism |
Alt-Svc header advertises alternative authority and protocol
ⓘ
clients cache advertised alternative services for a duration ⓘ clients may opportunistically switch to alternative services ⓘ |
| publishedBy |
HTTP Working Group
ⓘ
surface form:
IETF HTTP Working Group
Internet Engineering Task Force ⓘ |
| relatedTo |
HTTP/2 specification
ⓘ
HTTP/3 ⓘ
surface form:
HTTP/3 specification
TLS-based HTTP deployments ⓘ |
| scope |
does not change HTTP semantics of resources
ⓘ
does not require changes to resource URLs ⓘ |
| supports |
discovery of HTTP/2 services via HTTP/1.1
ⓘ
discovery of HTTP/3 services via HTTP/2 ⓘ failover to backup endpoints ⓘ load balancing across multiple endpoints ⓘ service migration without changing origin hostnames ⓘ |
| useCase |
migrating from HTTP/1.1 to HTTP/2
ⓘ
migrating from HTTP/2 to HTTP/3 ⓘ migrating traffic from one data center to another ⓘ serving content from a CDN while preserving origin authority ⓘ testing new protocols with fallback to existing ones ⓘ |
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: HTTP Alternative Services specification Description of subject: The HTTP Alternative Services specification is an IETF standard that defines a mechanism for HTTP servers to advertise alternative network endpoints or protocols that clients can use to access the same resources more efficiently or reliably.
Referenced by (3)
Full triples — surface form annotated when it differs from this entity's canonical label.
HTTP Alternative Services specification
→
defines
→
HTTP Alternative Services specification
self-linksurface differs
ⓘ
this entity surface form:
Alt-Svc HTTP header field
HTTP Alternative Services specification
→
defines
→
HTTP Alternative Services specification
self-linksurface differs
ⓘ
this entity surface form:
ALTSVC HTTP/3 frame