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247 lines
11 KiB
HTML
247 lines
11 KiB
HTML
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<ol class="chapter"><li class="chapter-item expanded "><a href="quinn.html"><strong aria-hidden="true">1.</strong> Quinn introduction</a></li><li class="chapter-item expanded "><a href="quic.html" class="active"><strong aria-hidden="true">2.</strong> The QUIC protocol</a></li></ol>
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<main>
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<h1><a class="header" href="#the-quic-protocol" id="the-quic-protocol">The QUIC protocol</a></h1>
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<p><a href="https://en.wikipedia.org/wiki/QUIC">QUIC</a> is a general-purpose network protocol built on top of UDP.
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The protocol is still under development and standardized by the <a href="https://www.ietf.org/">IETF</a>.
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Quinn strives to implement the latest <a href="https://datatracker.ietf.org/doc/draft-ietf-quic-transport/">draft</a> but may lag a bit behind. Although QUIC is still in a draft phase,
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the protocol is used for all connections from Chrome web browsers to the Google servers. </p>
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<p>QUIC solves a number of transport-layer and application-layer problems experienced by modern web applications.
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It is very similar to TCP+TLS+HTTP2, but implemented on top of UDP.
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Having QUIC as a self-contained protocol allows innovations which aren’t
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possible with existing protocols as they are hampered by legacy clients and middleboxes.</p>
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<p>Key advantages of QUIC over TCP+TLS+HTTP2 include:</p>
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<ul>
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<li>Improved connection establishment speed (0-rtt).</li>
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<li>Improved congestion control by moving congestion control algorithms into the user space at both endpoints.</li>
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<li>Improved bandwidth estimation in each direction to avoid congestion. </li>
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<li>Improved multiplexing without head-of-line blocking.</li>
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<li>Contains forward error correction (FEC). </li>
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</ul>
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<p>While QUIC's intentions are originally web-oriented, it offers interesting opportunities in other areas like game networking.
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One thing is for sure, QUIC has many great potentials and will serve us in the future with HTTP/3. </p>
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<p>In the upcoming chapter we will be discussing various aspects of QUIC also in relation to Quinn. </p>
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