ALPN
Used by user agents to specify response media types that are acceptable. The list of valid values are described in the TLS Application-Layer Protocol Negotiation (ALPN) Protocol IDs IANA registry.
ALPN is short for Application-Layer Protocol Negotiation and its original use in TLS is described in RFC 7301.
Overview table
- Name
- ALPN
- Description
- Specifies the protocols to initiate a CONNECT tunnel with.
- Direction
- Request
- Specification
- RFC 7639: The ALPN HTTP Header Field
Features:
Syntax
ALPN = 1#protocol-id
protocol-id = token ; percent-encoded ALPN protocol identifier
Examples
CONNECT www.example.com HTTP/1.1
Host: www.example.com
ALPN: h2, http%2F1.1