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Prioritization
The base HTTP/3 specification doesn't define prioritization itself. The HTTP/2 approach to prioritization has been deemed too complicated and is deprecated by the latest revision of the HTTP/2 specification RFC 9113. A simpler alternative, the Extensible Prioritization Scheme for HTTP (RFC 9218), has been published separately, which can be used in both HTTP/2 and HTTP/3.
In HTTP/3, priority signals are sent in the form of the Priority header field and/or the PRIORITY_UPDATE frame sent on the HTTP/3 Control Stream. Servers can act on these signals to schedule sending of HTTP response content. RFC 9218 provides scheduling guidance that is intended to improve client web application performance.
Last modified 7mo ago