What Is a Reverse Proxy?

The reverse proxy server is located between the user and the target server, but to the user, the reverse proxy server is equivalent to the target server, that is, the user can obtain the resources of the target server by directly accessing the reverse proxy server. At the same time, the user does not need to know the address of the target server and does not need to make any settings on the client. The reverse proxy server can usually be used as Web acceleration, that is, using the reverse proxy as the front end of the Web server to reduce the load on the network and servers and improve access efficiency. ^[1]

With the popularization and development of network technology and computers, proxy services have become more forms of online applications. Proxy service means that the internal network sends a connection request to the Internet. A proxy service needs to be formulated to send HTTP that was originally directly transmitted to the Web server to the proxy server. In other words, the proxy service is a relay station for network information. The proxy server is another type of server between the browser and the Web server. It is equipped with a proxy server. The browser does not need to go directly to the Web server to obtain the web page. It only needs to send the required request to the proxy server. Browser. Ordinary Web proxy servers only support access requests to the internal network. There is no obvious conflict between the reverse proxy service and ordinary proxy methods. If a proxy server can proxy external network hosts to access the internal network, this type of proxy service model is called reverse proxy service. Therefore, the system's firewall can be equipped with two methods at the same time, the reverse proxy is used to serve external network access, thereby providing the ability of the internal network to access the external network. Combining the function of reverse proxy with the software that rejects external access firewalls reasonably, so as to build a firewall system that not only contains the internal network but also publishes Web information to the outside. The reverse proxy function can provide a comprehensive connection record, thereby providing the ability to prevent and capture information. ^[2]

Usually

1) Improved internal server security

External network users access the internal server through the reverse proxy, and only see the IP address and port number of the reverse proxy server. The internal server is completely invisible to the external network. In addition, no information resources are stored on the reverse proxy server, and all web programs are stored on the internal server. An attack on the reverse proxy server cannot damage the real web information system, which improves the security of the internal server. Sex.

2) Speed up access to internal servers

Two reverse proxy servers are placed in front of the internal server, which are connected to the education network and the public network, so that users of the public network can directly access the school server through the public network lines, thereby avoiding the crowded chain between the public network and the education network road. At the same time, the cache function of the reverse proxy server also speeds up the user's access speed. ^[4]

If your content server has sensitive information that must be kept secure, such as a database of credit card numbers,

Configure secure reverse

(1) Reverse proxy server

The reverse proxy server's external performance is a Web server, and its main technology is address translation. With reverse proxy, client computers are not required

(1) Forward proxy and proxy server

The forward proxy is the so-called proxy. It is used to send a connection request to a server on the Internet (or an external server, usually a Web server) on behalf of the internal network user, and receive the response result. The server that performs the proxy function is called a proxy. server. When using a proxy server to access an external network, the client must indicate the address of the proxy server and the port number of the service to proxy in the LAN settings. ^[5]

(2) Reverse proxy and proxy server

The direction of the reverse proxy is opposite to that of the forward proxy, which refers to making requests to internal servers on behalf of users on the external network, that is, receiving connection requests from users on the Internet, and forwarding these requests to servers on the internal network, and then from the internal server The obtained response is returned to the client requesting a connection on the Internet: The server that performs the reverse proxy service is called a reverse proxy server, and the reverse proxy server appears as a server to external users. ^[5]