ALPN (Application-Layer Protocol Negotiation)
E209795
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.
All labels observed (4)
How this entity was disambiguated
This entity first appeared as the object of triple T1881576 — 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: ALPN (Application-Layer Protocol Negotiation) Context triple: [SPDY, negotiationMechanism, ALPN (Application-Layer Protocol Negotiation)]
-
A.
QUIC TLS usage specification
The QUIC TLS usage specification is an IETF document that defines how the QUIC transport protocol integrates and uses TLS for secure, encrypted internet communication.
-
B.
RFC 8446
RFC 8446 is the Internet standard that specifies TLS 1.3, a major revision of the Transport Layer Security protocol focused on improved security and performance for encrypted communications.
-
C.
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.
-
D.
QUIC
QUIC is a modern, multiplexed transport protocol developed by Google and standardized by the IETF that runs over UDP to provide faster, more secure, and reliable web connections than traditional TCP-based HTTPS.
-
E.
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.
- 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: ALPN (Application-Layer Protocol Negotiation) Target entity description: 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.
-
A.
QUIC TLS usage specification
The QUIC TLS usage specification is an IETF document that defines how the QUIC transport protocol integrates and uses TLS for secure, encrypted internet communication.
-
B.
RFC 8446
RFC 8446 is the Internet standard that specifies TLS 1.3, a major revision of the Transport Layer Security protocol focused on improved security and performance for encrypted communications.
-
C.
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.
-
D.
QUIC
QUIC is a modern, multiplexed transport protocol developed by Google and standardized by the IETF that runs over UDP to provide faster, more secure, and reliable web connections than traditional TCP-based HTTPS.
-
E.
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.
- F. None of above. chosen
Statements (46)
| Predicate | Object |
|---|---|
| instanceOf |
TLS extension
ⓘ
application-layer protocol negotiation mechanism ⓘ |
| abbreviation | ALPN ⓘ |
| allowsNegotiationOf |
HTTP/1.1
ⓘ
HTTP/2 ⓘ SPDY ⓘ custom application protocols ⓘ gRPC ⓘ |
| associatedWith |
HTTP/2 over TLS
ⓘ
HTTPS ⓘ TLS 1.2 ⓘ TLS 1.3 ⓘ
linked to:
RFC 8446
|
| avoids | additional round trips for protocol negotiation ⓘ |
| backwardCompatibility | can fall back to HTTP/1.1 if HTTP/2 not negotiated ⓘ |
| benefit |
enables protocol agility
ⓘ
reduces latency for protocol selection ⓘ supports coexistence of multiple application protocols on same port ⓘ |
| definedIn |
Transport Layer Security (TLS)
ⓘ
linked to:
TLS
|
| failureBehavior | connection may be terminated if no protocol is acceptable ⓘ |
| fullName | Application-Layer Protocol Negotiation ⓘ |
| impact | enables deployment of new application protocols without new ports ⓘ |
| negotiatesOver | encrypted TLS handshake messages ⓘ |
| negotiationDirection | client to server ⓘ |
| negotiationModel | client proposes list of protocols ⓘ |
| negotiationPhase | during TLS handshake ⓘ |
| operatesAtLayer | application layer ⓘ |
| protocolIdentifierFormat | opaque byte strings representing protocols ⓘ |
| purpose | negotiate application-layer protocol over a secure connection ⓘ |
| relevance | critical for modern web performance ⓘ |
| replaces | Next Protocol Negotiation ⓘ |
| roleInHTTP2 | selects HTTP/2 vs HTTP/1.1 over TLS ⓘ |
| securityProperty | protected by TLS handshake integrity ⓘ |
| serverBehavior | selects one protocol from client list ⓘ |
| standardizedBy |
IETF
ⓘ
linked to:
Internet Engineering Task Force
|
| statusComparedToNPN | standardized successor ⓘ |
| supports | multiple protocol identifiers in a single handshake ⓘ |
| typicalPort | 443 ⓘ |
| usedBy |
CDN providers
ⓘ
HTTP/2 implementations ⓘ QUIC-over-TLS implementations ⓘ reverse proxies ⓘ web browsers ⓘ web servers ⓘ |
| usedFor | multiplexing different application protocols on same TLS endpoint ⓘ |
| usedIn |
TLS handshake
ⓘ
linked to:
TLS
|
| visibility | not visible to application data layer after handshake ⓘ |
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: ALPN (Application-Layer Protocol Negotiation) Description of subject: 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.
Referenced by (8)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: ALPN (Application-Layer Protocol Negotiation)
subject linked to:
ALPN (Application-Layer Protocol Negotiation)
linked to: ALPN (Application-Layer Protocol Negotiation)
linked to: ALPN (Application-Layer Protocol Negotiation)
linked to: ALPN (Application-Layer Protocol Negotiation)