HTTP registry: 0x00

Reserved

HTTP/2 registry values apply to binary framing, stream state, connection setup, or protocol negotiation. 0x00 is registered in HTTP/2 Settings. Defining reference: rfc9113.

httpregistryhttp2-parameterssettings

Identifier (http)

0x00

Reserved

Do not serialize HTTP/2 control values as ordinary HTTP/1.1 fields; let a compliant stack enforce ordering, stream state, and bounds.

This registry value is currently marked active by IANA. Follow the defining specification before sending, accepting, or proxying it.

IANA registry: http2-parameters/settings

Registry reference: rfc9113

Sources

HTTP/2 Settings
rfc9113