https://chengl.com/tags/http/2/Recent content in HTTP/2 on Random MusingsHugoen-usCheng LongSun, 30 Jul 2017 08:56:19 +0000https://chengl.com/post/http2/Mon, 14 Mar 2016 08:53:00 +0000https://chengl.com/post/http2/<h3 id="what-is-http2-and-why">What is HTTP/2 and Why</h3> <p><a href="https://tools.ietf.org/html/rfc2068">HTTP/1.1</a> has been serving most part of the Web since 1997. As websites get more and more sophisticated and resource intensive, it starts to show its limitations, e.g. one outstanding request per TCP connection. So its next-generation emerged: <a href="http://http2.github.io/">HTTP/2</a>.</p> <p><a href="http://http2.github.io/faq/">HTTP/2 FAQ</a> does a great job explaining the background and specifications. Highly recommended. Here is an executive summary, HTTP/2:</p> <ul> <li>is specifically designed to improve performance</li> <li>is based on <a href="http://tools.ietf.org/html/draft-mbelshe-httpbis-spdy-00">SPDY</a></li> <li>is binary, instead of textual</li> <li>is fully multiplexed, instead of ordered and blocking</li> <li>can therefore use one connection for parallelism</li> <li>uses header compression to reduce overhead</li> <li>allows servers to push responses proactively into client caches</li> <li>is backward-compatible, designed to be drop-in replacement for HTTP/1.1</li> <li>is <a href="http://caniuse.com/#search=http%2F2">supported by most broswers over TLS</a></li> </ul> <p>HttpWatch <a href="https://blog.httpwatch.com/2015/01/16/a-simple-performance-comparison-of-https-spdy-and-http2/">reported</a> good performance improvement by using HTTP/2.</p>