topic Registered
Verified 2026-09-19 · registry updated
2023-06-13HTTP registry: 0x33
0
HTTP/3 registry values apply to QUIC-backed streams, frames, settings, or protocol negotiation. 0x33 is permanent in HTTP/3 Settings. Defining reference: rfc9297.
httpregistryhttp3-parametershttp3-parameters-settings
Identifier (http)
0x33
0
Preserve HTTP semantics while accounting for QUIC migration, TLS/ALPN negotiation, and early-data replay risk.
This registry value is currently marked permanent by IANA. Follow the defining specification before sending, accepting, or proxying it.
IANA registry: http3-parameters/http3-parameters-settings
Registry reference: rfc9297
Sources