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57 .IX Title "OSSL-GUIDE-QUIC-INTRODUCTION 7ossl"
58 .TH OSSL-GUIDE-QUIC-INTRODUCTION 7ossl 2025-09-30 3.5.4 OpenSSL
64 ossl\-guide\-quic\-introduction
65 \&\- OpenSSL Guide: An introduction to QUIC in OpenSSL
69 background and how it is used within OpenSSL. It assumes that you have a basic
71 some OpenSSL and TLS fundamentals (see \fBossl\-guide\-libraries\-introduction\fR\|(7)
72 and \fBossl\-guide\-tls\-introduction\fR\|(7)).
80 integrity and authentication (see \fBossl\-guide\-tls\-introduction\fR\|(7)).
90 "head-of-line blocking"). It also enables an application to open additional
91 logical streams without requiring a round-trip exchange of packets between the
97 to use HTTP/3 using a suitable third-party library.
100 Future versions of OpenSSL will offer support for 0\-RTT connection initiation,
102 transmitted without any waiting time. This is similar to TLS 1.3's 0\-RTT
104 it is similar to a combination of TLS 1.3 0\-RTT and TCP Fast Open.
112 allowing support for both TLS and DTLS-style use cases on a single connection.
123 Because QUIC is UDP-based, it is possible to multiplex a QUIC connection on the
124 same UDP socket as some other UDP-based protocols, such as RTP.
146 create a background thread and will regularly call \fBSSL_handle_events\fR\|(3) in a
156 without using TLS \- although some TLS handshake messages may still be sent in
172 effectively has one bi-directional stream available to it per TLS connection. A
173 QUIC application can have multiple uni-directional or bi-directional streams
190 TLS assumes "stream" type semantics for its underlying transport layer protocol
193 BIO to represent the underlying transport layer. This BIO must support datagrams
212 See \fBossl\-guide\-quic\-client\-block\fR\|(7) to see an example of applying these
215 See \fBossl\-guide\-quic\-server\-block\fR\|(7) to see an example of applying these
219 \&\fBossl\-guide\-introduction\fR\|(7), \fBossl\-guide\-libraries\-introduction\fR\|(7),
220 \&\fBossl\-guide\-libssl\-introduction\fR\|(7), \fBossl\-guide\-tls\-introduction\fR\|(7),
221 \&\fBossl\-guide\-tls\-client\-block\fR\|(7), \fBossl\-guide\-quic\-client\-block\fR\|(7),
222 \&\fBossl\-guide\-quic\-client\-non\-block\fR\|(7), \fBossl\-guide\-quic\-multi\-stream\fR\|(7),
223 \&\fBossl\-guide\-quic\-server\-block\fR\|(7), \fBossl\-guide\-quic\-server\-non\-block\fR\|(7),
227 Copyright 2023\-2025 The OpenSSL Project Authors. All Rights Reserved.