topic Provisional
Verified 2026-09-19 · registry updated
2023-06-13HTTP registry: 0x4d44
0
HTTP/3 registry values apply to QUIC-backed streams, frames, settings, or protocol negotiation. The registry marks this value provisional; review compatibility before deploying it. 0x4d44 is provisional in HTTP/3 Settings. Defining reference: draft-beky-httpbis-metadata-02.
httpregistryhttp3-parametershttp3-parameters-settings
Identifier (http)
0x4d44
0
Preserve HTTP semantics while accounting for QUIC migration, TLS/ALPN negotiation, and early-data replay risk. The registry marks this value provisional; review compatibility before deploying it.
This registry value is currently marked provisional by IANA. Follow the defining specification before sending, accepting, or proxying it.
IANA registry: http3-parameters/http3-parameters-settings
Registry reference: draft-beky-httpbis-metadata-02