Differences and Applications of Forward and Reverse Proxies

The Concept and Working Principle of Positive Proxies

Hey internet peeps, today I'm going to talk to you about an amazing being that is a proxy. Speaking of proxies, some people may think of it as something similar to a vest, something that replaces an identity. However, the proxy we're going to talk about today doesn't play a role in this regard, it's an existence that has a special function in the online world.

First, let's take a look at the forward proxy, which, as the name suggests, is a middleman that sits between the client and the server. Hey, don't you have a feeling that you are being counted by them jointly? Let's say you intend to visit a certain website, but your request is first sent to the forward proxy server, and then it forwards it to the target server for you. In this way, the target server doesn't know your real ip address directly, only the ip address of the forward proxy server.

举个栗子吧，假设你现在在国内而想访问国内的某个网站，因为众所周知的原因，国内服务器有可能慢得像蜗牛一样。这时候，正向代理就可以帮上忙了！它可以通过在国内搭建服务器，将你的请求先发送到那个服务器，再由服务器帮你访问目标网站。这样一来，国内服务器就以为你就是那个正向代理服务器，简直就是骗人高手啊！

Definition and working principle of reverse proxy

Continuing on from above, let's take a look at reverse proxies. Reverse proxies are somewhat similar to forward proxies in that, like them, they are intermediaries that sit between the client and the server, but their roles are different. A forward proxy is a request forwarder on behalf of the client, while a reverse proxy receives requests on behalf of the server and forwards them to the appropriate processing node.

To put it plainly, you can think of a reverse proxy as a gatekeeper for the server. When someone comes to access the server, the gatekeeper will forward the request to different back-end servers according to the access requirements (e.g., content of the web page, load balancing, etc.). In this way, the visitor is like meeting a behind-the-scenes person who has no idea about the exact server address and processing logic.

Or let's take an example to illustrate. Suppose there is a shopping site, a large number of users to visit, how to ensure that the response speed is fast, the site does not crash? This is where a reverse proxy comes into play! Reverse proxy can be based on the access situation, the request will be diverted to different servers in the website cluster, so as to effectively avoid the server overload problem, so that the website can run smoothly.

Difference between Forward and Reverse Proxy

These two types of proxies may seem similar, but in reality their roles and ways of working are quite different. A forward proxy forwards requests on behalf of the client, who communicates with the target server through the forward proxy, while a reverse proxy accepts requests on behalf of the server and routes them to the appropriate back-end server.

To take the difference a step further, forward proxies take the model that the client initiates the request and the forward proxy forwards it. Reverse proxy, on the other hand, is initiated by the client request, but the request is sent to the reverse proxy server, and then the reverse proxy server will forward the request to the back-end server. Such differences lead to different application scenarios and roles.

Application Scenarios for Forward and Reverse Proxies

Forward and reverse proxies have their own characteristics and application scenarios, which I'd like to share with you!

正向代理的应用场景相对简单粗暴，主要是为了突破网络限制、保护隐私和代理ip访问。比如在上面的例子中，我们提到了国内用户访问国内网站时，可以通过正向代理来代理ip访问。此外，正向代理还可以用于绕过局域网限制，访问被封锁的网站，像代理一样刺激哦！

Reverse proxies have a wider range of applications and play a very important role in the modern Internet in particular. It can be used for load balancing, distributing requests to back-end servers, and improving the concurrent processing capacity of a website. At the same time, reverse proxies can also be used to cache static content, reducing the burden on back-end servers and increasing the speed of access to the site. Wow, this is simply a great tool to take the load off the server!

put at the end

Forward and reverse proxies may sound a bit complicated, but as long as you understand how they work and the application scenarios, you will be able to easily cope with the various challenges of the network world. That's all for today, guys! I hope this helps you to have a deeper understanding of proxies!