RFC 7639: The ALPN HTTP Header Field

This specification allows HTTP CONNECT requests to indicate what protocol is intended to be used within the tunnel once established, using the ALPN header…

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Outgoing relationships (8 related RFCs)

Normative reference — RFC 2119: Key words for use in RFCs to Indicate Requirement Levels
Normative reference — RFC 3986: Uniform Resource Identifier (URI): Generic Syntax
Normative reference — RFC 7230: Hypertext Transfer Protocol (HTTP/1.1): Message Syntax and Routing
Normative reference — RFC 7231: Hypertext Transfer Protocol (HTTP/1.1): Semantics and Content
Normative reference — RFC 3864: Registration Procedures for Message Header Fields
Normative reference — RFC 7301: Transport Layer Security (TLS) Application-Layer Protocol Negotiation Extension
Informative reference — RFC 5246: The Transport Layer Security (TLS) Protocol Version 1.2
Informative reference — RFC 5766: Traversal Using Relays around NAT (TURN): Relay Extensions to Session Traversal Utilities for NAT (STUN)

Incoming relationships (1 related RFC)

Normatively referenced by — RFC 8835: Transports for WebRTC