topic Registered
Verified 2026-09-19 · registry updated 2023-06-13

HTTP registry: 0x06

Unlimited

HTTP/3 registry values apply to QUIC-backed streams, frames, settings, or protocol negotiation. 0x06 is permanent in HTTP/3 Settings. Defining reference: RFC9114, Section 7.2.4.1.

httpregistryhttp3-parametershttp3-parameters-settings

Identifier (http)

0x06

Unlimited

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: RFC9114, Section 7.2.4.1

Sources

Permalink: https://merginit.com/reference/http/registry/http3-parameters/http3-parameters-settings/0x06-275