Linux Small Knowledge Translation-Proxy server

This time, talk about "proxy server".

In the company, not through the proxy server can not connect to the Internet, due to proxy server reasons, some services are limited use.

Someone might think why this kind of thing exists? (This refers to the proxy server)

The proxy is meant to be "proxies". Proxy server is a layer between the client and the server, it is the client for the server, it is the server for the client.

The best thing to understand is the HTTP proxy, "When the client has a request, the HTTP proxy obtains the request, then sends the request to the server instead of the client and returns the result back to the client."

So why do we need an intermediary agent in this layer?

One reason, the proxy server can save the results returned by the Web server, the next time, if the same request, the proxy server can directly return the results to the client, improve access speed. A proxy server is the equivalent of a "cache" of data that can be accessed at high speed.

However, with the high speed of the Internet, the meaning of proxy server as "cache" is also getting smaller.

Now the biggest point of proxy server is to improve security. and external communication if all through the proxy, then as long as the proxy server to check whether there are unusual traffic, you can ensure the security of the internal network.

Of course, logging of access logs can also be implemented.

In addition, the company can use agents to implement filtering functions, that is, during office hours, restricting the company's network access to work-related pages.

In order to use the network rationally, the agent is an indispensable thing.