Proxy, also known as a web proxy, is a web service that acts as an intermediary between a client and a website. Users browse the website through the proxy server, which can hide the real IP address of the client, and all traffic will be routed through the proxy server. Therefore, the website will only record the IP address of the proxy server and not the IP address of the client to protect the privacy of the client.

Proxy has a cache function. The webpage content that the user has browsed will be stored in the cache area of ​​the proxy server. When other users access the same webpage content, they can directly retrieve the data from the cache area without connecting to the website to download it, which can effectively save the network. Bandwidth to improve web browsing speed. Therefore Proxy is usually used as a cache node. The proxy can also filter web content to restrict users from browsing specific websites.

There are three main types of proxies:

HTTP proxy: Mainly used to access web pages, it can filter web content and cache web pages. If you set up an HTTP proxy server on your browser, all traffic on your browser will be routed through this proxy server.

SOCKS proxy: This type of proxy simply transmits packets. In addition to accessing web pages, it can also be used for applications such as online games, video streaming, instant messaging, and P2P. SOCKS can be divided into SOCKS4 and SOCKS5, of which SOCKS4 only supports the TCP protocol, while SOCKS5 supports the TCP and UDP protocols. SOCKS5 supports authentication and has better security.

Transparent Proxies: These types of proxies are usually used to monitor users' web activities and prevent users from accessing specific websites, and users are usually unaware of the existence of such web proxies. Transparent proxies are often used in corporate network management or home network control, restaurants or hotels to authenticate public wireless networks. Companies or households can also set up this kind of network proxy to save bandwidth.

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