HTTP registry: 0x03

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MASQUE values support proxying datagrams or traffic through HTTP/3 and extended CONNECT. 0x03 is permanent in HTTP Capsule Types. Defining reference: rfc9484.

httpregistrymasquehttp-capsule-types

Identifier (http)

0x03

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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: rfc9484

Sources

HTTP Capsule Types
rfc9484