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This article mainly explains "what is the role of the forward agent of the proxy server". The content of the explanation in the article is simple and clear, and it is easy to learn and understand. let's study and learn "what is the role of the forward agent of the proxy server"?

The role of the front agent:

1. Customer access authorization and Internet authentication.

The firewall is used as the gateway to filter the access to the external network. Suppose that both user An and user B have established a proxy server, and user An allows user B to access the Internet, but user B does not allow access to the Internet (this is restricted on the proxy server). User B is not authorized by the proxy server, so the packet is dropped directly when accessing the target server.

2. Access to unavailable resources.

In the diagram, the router is R1 from left to right, R2 assumes that initial user A needs to pass through routing nodes such as R1 and R2 routers to access the target server, and if router R1 or router R2 fails, will not be able to connect to the target server. However, if user An allows the proxy server to access the target server, user A can obtain the data of the target server because the proxy server is not in the router R1 or R2 node, but accesses the target server through other routing nodes. In fact, this is "climbing over the wall".

3. Agents can record user access records (Internet behavior management) and hide user information externally.

The destination server does not know that the real access is user A, because the proxy server interacts directly with the target server instead of user A. If the proxy server is completely controlled (or not completely controlled) by user A, you are used to using the word "broiler".

4. Caching can be carried out to speed up access to resources.

Mainly to increase the broadband traffic of proxy servers, which is not popular at present.

Cache (Cache) technology is closely related to proxy service technology (not only frontal proxy, reverse proxy also uses Cache (caching) technology. Also as shown above, if someone has accessed the data on the target server through the proxy server before user An accesses the data on the target server, then the proxy server will save the data for a period of time. If someone just gets the data, the proxy server can no longer access the target server and sends the cached data directly to user A. In Cache, the term for this technology is called Cache hitting. If more users like user An access the proxy server, then these users can get data directly from the proxy server without having to go far to the target server to download the data.

What is a positive agent?

Forward proxy (forwardproxy): a server (proxy server) located between the client (user A) and the original server (originserver). To get content from the original server, the client sends a request to the proxy server and specifies the target (the original server), and then the proxy server sends the request to the original server and returns the resulting content to the client. Before using the forward proxy, the client must make some special configuration. In general, without special instructions, the proxy technology defaults to the forward proxy technology.

From the above concepts, we can know that the so-called forward proxy, that is, the proxy server instead of the client (user A), to access the original server (target server).

Thank you for your reading. the above is the content of "what is the role of the forward agent of the proxy server". After the study of this article, I believe you have a deeper understanding of what is the role of the forward agent of the proxy server. the specific use also needs to be verified by practice. Here is, the editor will push for you more related knowledge points of the article, welcome to follow!

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