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The HTTP/1.1 protocol has been used since 1999 and over time has acquired one significant problem. Modern sites, in contrast to what was popular in 1999, use a lot of different elements: JavaScript scripts, CSS styles, and sometimes also flash animation. When you transfer all of them, the browser and the server create several connections.https://www.wpoven.com/blog/what-is-http2/
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The HTTP/2 protocol significantly speeds up the websites speed due to the following features: Connections: multiple requests can be sent via a single TCP connection, and responses can be received in any order. There is no need to keep multiple TCP connections. Thread priorities: the client can set the server priorities — what kind of resources are more important to him than others. Header compression: the size of the HTTP header can be reduced. Push-sending the data from the server side: the server can send to the client the data that has not yet been requested, for example, based on data about the next page the users are going to open. ● ● ● ●
What is HTTP/2: How It Works and What It Means for the Web