topic Registered
Verified 2026-09-19 · registry updated
2023-06-13HTTP registry: 0x0201
Error on the encoder stream
HTTP/3 registry values apply to QUIC-backed streams, frames, settings, or protocol negotiation. 0x0201 is permanent in HTTP/3 Error Codes. Defining reference: RFC9204, Section 6.
httpregistryhttp3-parametershttp3-parameters-error-codes
Identifier (http)
0x0201
Error on the encoder stream
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-error-codes
Registry reference: RFC9204, Section 6