What are the common proxy servers and what are the differences?

　　1、 Standard proxy server (StandardProxyCache)

　　 A standard proxy cache is usually used to store static web pages on a machine in the local network (html,image). If this page is asked again , The browser will cache directly from the local proxy (ProxyCache) get , Not from the source WebServer. The browser is explicitly configured to use a proxy server , all HTTP Requests are directed to the proxy server's cache , Instead of WebServer. The cache will directly meet the requirements ( When storage is required in the cache ) Or forward the request to the target server .

　　2、 Transparent proxy server

　　 Transparent agents perform the same functions as standard agents , But the operation of the browser is transparent . The browser does not need to explicitly configure the proxy server . contrary , Transparent proxy will cut off network communication , Filter 80 A fracture HTTP signal communication .

　　 If the filtered request exists in the cache of the transparent proxy server , Will be directly cached ; If there is no , Then the package will be sent to the target server . The proxy is transparent iptables and ipchains stay Linux Intercept the network communication .ISPs(Internet Service provider ) Extensive use of transparent proxies , Because they need a mode without browser settings . meanwhile , Transparent proxy server is also a simple way to build cache on LAN , Because it doesn't need the same external cache .

　　3、 Reverse proxy (ReverseProxyCache)

　　 Unlike standard proxy servers and transparent proxy servers , The reverse proxy server is mainly used to alleviate WebServer The load of , Instead of reducing the load of client network bandwidth traffic . The reverse proxy server can cache WebServer Static content to protect the server from unexpected overload . The reverse proxy server is located between the Internet and the Internet , Control all requests to reach the Internet . The reverse proxy server intercepts all requests to the Internet , And respond to the contents of the cache . This method can improve the efficiency of the Internet by reducing the actual response of a large number of the Internet .