HTTP registry: 0x12

COMPRESSION_ACK

MASQUE values support proxying datagrams or traffic through HTTP/3 and extended CONNECT. 0x12 is permanent in HTTP Capsule Types. Defining reference: RFC-ietf-masque-connect-udp-listen-16.

httpregistrymasquehttp-capsule-types

Identifier (http)

0x12

COMPRESSION_ACK

Apply strict authorization and destination policy so tunnels cannot reach arbitrary internal networks or ports.

This registry value is currently marked permanent by IANA. Follow the defining specification before sending, accepting, or proxying it.

IANA registry: masque/http-capsule-types

Registry reference: RFC-ietf-masque-connect-udp-listen-16

Sources

HTTP Capsule Types
RFC-ietf-masque-connect-udp-listen-16