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In view of how the proxy server should work, this article introduces the corresponding analysis and answer in detail, hoping to help more partners who want to solve this problem to find a more simple and easy way.

Everyone must have come into contact with the proxy server, but many people are not quite clear about how it works. First of all, we need to understand the basic principles of "proxy".

Agent

The web agent is some kind of intermediary between Web users and online resources, in other words, it is a "middleman".

When visiting the website directly, the browser will send a web request containing information about yourself (what browser or PC to use, location, Session ID,IP address, etc.). In response to the data sent, the Web resource will feed back to you the appropriate content.

Unlike direct connections between users and websites, agent-based connections:

Your Web request and the data you will receive from the website provide the gateway. Agents can hide or modify your Web request data and filter site content to prevent unwanted information from being obtained. At the same time, anonymous Web browsing and the effect of preventing data collection can be carried out.

Agents are divided into:

Sharing agent

Dedicated agent

Sharing agent

A shared agent is a public agent that anyone can easily access.

Sharing agents are usually available free of charge, and there is no limit to the number of users they serve. This kind of proxy server is usually used by a large number of Web users at the same time, resulting in overload and slowing down Internet connections, so the sharing agent often crashes or has high latency.

Under normal circumstances, a web page that can be loaded in a second needs to wait for more than ten seconds or more after using the sharing agent, so that it is impossible to browse the web page.

In addition, browsing Internet through these open agents can be risky because providers can use them as a way of information collection and personal information theft. (it is equivalent to that I need to log in Zhihu now. I need to tell the agent my user name and password first, and then the agent will help me log in.)

Of course, there is also a semi-dedicated agent with a limited number of users. Suitable for a small group of people such as a company or school to create a shared network connection.

Dedicated agent

A dedicated agent is an agent that allows you to use it privately, that is, it belongs to you alone. Compared with the shared agent above, it is more efficient and more secure. (of course, the cost is also high)

Proxy server

A proxy server is a server that acts as an intermediate connection point between you and the web page you visit. The proxy server processes your Web requests and website data, making your Web browsing more secure and private. (or access pages that you cannot access through a proxy server)

How does the proxy server work?

Whenever you visit the site by clicking on a link or manually entering a URL in a browser, a Web request is created and submitted to be forwarded to the proxy server. Then, the proxy server modifies and encrypts your data, such as IP (Internet Protocol) address, and goes to request the appropriate server.

After that, the website sends the data back to your proxy server, which transmits the information on the web page to you. In this way, it can act as a firewall or Web filter so that your web page displays only the information you need. (can be used for functions such as advertising filtering)

Proxy servers can be roughly divided into three types:

Forwarding proxy server

Reverse proxy server

Open proxy server

Forwarding proxy server (forward proxy server)

When a user sends a request to connect to a specific Web site, it must first forward the proxy server, which decides whether to allow the client to access the resource. If so, the connection request goes to the external server, which does not see the client's IP address, but only the connection request sent from the forward proxy server.

The forwarding proxy server provides complete administrative control over the local network connection. It acts as a shield or firewall, allowing administrators to restrict access to unwanted Web resources by internal network clients. This kind of proxy server is mostly used in campus network.

Reverse proxy server

Unlike a forward proxy server, a reverse proxy server works on one side of a Web site (or Web service), hiding IP addresses in the internal network from external users. The reverse proxy determines whether Web users can view the content of the site or use the Web service.

The advantage is that reverse proxy servers make it difficult for hackers to attack internal servers. In addition, there is a load balancing function that distributes data between internal servers to prevent server overload caused by a large number of connection requests. Most Web service providers use this kind of proxy server.

Open proxy server

The open proxy server can not only forward the requests of Internet users, but also receive the response of the website. The main function of this proxy server is to hide the user's original IP address from Web. Unlike dedicated proxies, open proxy servers do not require user authentication and are vulnerable to attacks.

Why use a proxy server?

Benefits of using a proxy server:

Privacy and confidentiality

Agents can encrypt your data and configure your IP to hide the real location. In this way, the server that sent the request will not know your actual IP and other personal information. In order to avoid risks such as hacking and identity theft.

Visit any website

In addition to being able to browse anonymously, hiding IP addresses has other benefits. Suppose you want to visit a website that restricts the browsing of content in your country (that is, by a wall). In this case, the IP address can be changed to exceed the limit. Therefore, the proxy server can help you access any website on the network with such restrictions.

Higher security

The data that visits the site is kept secret, so your Internet connection becomes more secure. Agents can be configured and modified so that the network only sees the information it is allowed to access. Agents can also be used as Web firewalls to protect your device and filter Web resources that may contain malware.

Performance improvement

Proxy servers can also improve the performance of browsing websites. For example, if you visit a website, it will be saved in the cache of the proxy server. The next time you visit the site, the agent sends a request to the site server to find any changes, and if no changes are detected, it displays the cached version of the site. As a result, you can reduce the loading time of sites that have been visited. For most people, it is beneficial and harmless.

The answer to the question about how the proxy server should work is shared here. I hope the above content can be of some help to you. If you still have a lot of doubts to be solved, you can follow the industry information channel for more related knowledge.

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