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

HTTP registry: 0x03

Both

HTTP/3 registry values apply to QUIC-backed streams, frames, settings, or protocol negotiation. 0x03 is permanent in HTTP/3 Stream Types. Defining reference: RFC9204, Section 4.2.

httpregistryhttp3-parametershttp3-parameters-stream-types

Identifier (http)

0x03

Both

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-stream-types

Registry reference: RFC9204, Section 4.2

Sources

Permalink: https://merginit.com/reference/http/registry/http3-parameters/http3-parameters-stream-types/0x03-304