Shulou(Shulou.com)06/02 Report--

What I want to share with you in this article is what are the main improvements to the HTTP2 protocol. The editor thinks it is very practical, so I share it with you. I hope you can get something after reading this article.

1. Change it to a binary protocol. Each time a binary frame is transmitted, the frame has the following fields.

Type type, length length,flag,StringID flow flag, Payload payload, the most basic two types: HEAD type and DATA type

2. Multiplexing allows multiple data streams to be transmitted at the same time on a single connection. The transmission order of each stream is fixed and can be spliced successively.

3. Support priority, through weight

4. Reset interrupt is supported. In HTTP/1.1, if a request is sent, it is difficult to cancel if it is not finished. You can only disconnect the TCP connection this time, but it takes time to disconnect the reconnection. HTTP2 can send a RST_STREAM frame to cancel the request transmission, and then restart the transmission.

5. Header compression. Most request headers are similar, especially information like cookie, which sometimes accounts for a heavy proportion and can be compressed.

6. Support server push. When the server responds to the client's request for A resource, it is estimated that B resource may be used immediately. The server can send B resource to the client. Of course, the premise is that the client displays to inform the server that the client allows such push, and the client finally has the right to decide whether to accept it or not. If not, it can send a RST_STREAM frame to cancel.

7. Support flow control and support the size of the data window in which the client and server communicate with each other

The above are the main improvements to the HTTP2 protocol, and the editor believes that there are some knowledge points that we may see or use in our daily work. I hope you can learn more from this article. For more details, please follow the industry information channel.

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