Under normal circumstances, when we use a web browser to directly connect to other Internet sites to obtain network information, we must send a Request signal to get an answer, and then the other party will send the information back in the form of bit. The proxy server is a server between the browser and the Web server. With it, the browser does not go directly to the Web server to retrieve the web page, but sends a Request to the proxy server. The request signal will be sent to the proxy server first, and the proxy server will retrieve the information needed by the browser and send it to your browser. Moreover, most proxy servers have the function of buffering, just like a large Cache, which has a large storage space. It constantly stores newly acquired data in its local storage. If the data requested by the browser already exists in its local storage and is up-to-date, it will not retrieve the data from the Web server again, but directly transfer the data from the storage to the user's browser, which can significantly improve the browsing speed and efficiency. More importantly, Proxy Server is an important security function provided by Internet link-level gateway, and its work is mainly in the dialogue layer of OSI model.

The main functions are:

1. Break through its own IP access restrictions and visit foreign sites. Network users such as Education Network and 169 Network can access foreign websites through agents.

2. Access to internal resources of some units or groups, such as FTP of a university (provided that the proxy address is within the allowed access range of the resources), and use the free proxy server in the address section of the education network, which can be used for all kinds of FTP downloads and uploads open to the education network, as well as all kinds of information query and enjoyment services.

3. Break through the IP blockade of China Telecom: Many websites of China Telecom users are restricted from accessing. This restriction is artificial, and the blockade of addresses by different Serve is different. So when you can't access it, you can try another foreign proxy server.

4. Improve the access speed: Generally, the proxy server has a large hard disk buffer. When external information passes through, it is also saved in the buffer. When other users access the same information again, the information is directly taken out of the buffer and passed to users to improve the access speed.

5. Hide the real IP: Internet surfers can also hide their IP in this way to avoid attacks.

At present, Web Proxy Server is the best way to access international websites simply, quickly and effectively. Its function is a transit point between users and Web servers. When users visit international websites, they access the target websites through the proxy servers and cache them in the proxy servers. In this way, if the site visited by the user has been visited before, the user will directly read the information from the proxy server, thus significantly improving the browsing speed and efficiency. In addition, the web proxy can shield malicious web code to protect your browser from interference.

In addition, a network accelerator is also a form of agency.