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HTTP/3 0-RTT

HTTP/3 can use QUIC's 0-RTT resumption to reduce connection setup latency, subject to replay-related limitations.

TopicIT knowledge → About 1 min read

Simple definition

HTTP/3 can use QUIC's 0-RTT resumption to reduce connection setup latency, subject to replay-related limitations.

Purpose and use

HTTP/3 0-RTT can send selected application data while resuming a QUIC connection, before the new handshake completes.

How does it work?

The client reuses information from an earlier connection, and the server can accept or reject this early data.

Example and verification

Before enabling it for an application, identify eligible requests and verify that replay cannot duplicate sensitive operations.

Points to watch

The improvement reduces startup waiting rather than eliminating all latency. Early data has replay-protection limitations.

In short

0-RTT requires suitable application policy beyond the server merely supporting HTTP/3.

Related resources

Relevant topic HTTP/3 HTTP/3 is a version of HTTP using QUIC in place of TCP. Relevant topic HTTP Cache HTTP caching stores reusable responses according to cache headers, validators, and freshness rules. Relevant topic HTTP Header An HTTP header is a field carrying metadata about a request or response, such as content type or caching rules. Relevant topic HTTP Keep-Alive HTTP keep-alive reuses a network connection for multiple requests instead of opening a connection each time. Relevant topic TLS Handshake A TLS handshake negotiates cryptographic parameters, authenticates server identity, and establishes encrypted sessi...
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