Reverse proxy is commonly referred to as web server acceleration. It is a technology that reduces the load of the actual web server by adding a high-speed web buffer server between a busy web server and the external network.

Reverse proxy accepts connection requests on the Internet through a proxy server, and then forwards the request to the server on the internal network; and returns the result obtained from the server to the client requesting the connection on the Internet. At this time, the proxy server appears to the outside as a server.

Common proxy servers are only used to proxy connection requests from the internal network to the Internet external network. The client must specify a proxy server and send the http request that was originally sent directly to the Web server to the proxy server. Connection requests from the external network to the internal network are not supported because the internal network is invisible to the external network.

The reverse proxy server will force the external network to access the server to be proxied through it, so that the reverse proxy server is responsible for receiving the client's request, and then obtaining the content from the source server, returning the content to the user, and saving the content locally, so that when the same information request is received in the future, it will send the content in the local cache directly to the user, so as to reduce the pressure on the back-end web server and improve the response speed.

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