wikipedia讲http keepalive选项作用的图

最新推荐文章于 2022-06-22 15:04:51 发布

转载最新推荐文章于 2022-06-22 15:04:51 发布 · 1.6k 阅读

文章标签：

#tcp #network #idea

本文介绍了HTTP持久连接（也称为HTTP Keep-Alive或HTTP连接复用）的概念，即使用同一个TCP连接发送和接收多个HTTP请求/响应，而不是为每个请求/响应对打开新的连接。讨论了持久连接的优势，包括减少CPU和内存使用、启用HTTP请求和响应管道化、降低网络拥塞等。

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HTTP_persistent_connection.svg‎

keepalive的时间范围内，这些http请求共用同一个TCP connection. 如果keepalive为off的话，则每次http请求都需要新建tcp connection

摘自wikipedia：
HTTP persistent connections, also called HTTP keep-alive, or HTTP connection reuse, is the idea of using the same TCP connection to send and receive multiple HTTP requests/responses, as opposed to opening a new connection for every single request/response pair.

Advantages
less CPU and memory usage (because fewer connections are open simultaneously)
enables HTTP pipelining of requests and responses
reduced network congestion (fewer TCP connections)
reduced latency in subsequent requests (no handshaking)
errors can be reported without the penalty of closing the TCP connection