Explanation and Application of Positive Agents

Hey students! Today I'm going to explain to you a very important but also a bit mysterious concept - forward proxies. You might be a bit unfamiliar with the term forward proxy, but trust me, it plays a crucial role in the online world. So, what exactly is a forward proxy?

What is a Positive Proxy

First, let's look at the English explanation of Forward Proxy, which is called "Forward Proxy". Well, Forward Proxy means that a proxy server acts as a middleman between the client and the target server. Sounds a bit abstract, doesn't it? Let me give you an example to help you understand it better.

假设你正在访问一个被的网站，但你又想获取其中的一些信息。这时候，你可以使用正向代理来帮助你”突破”防火。当你发起一个请求时，正向代理服务器会将你的请求转发给目标服务器，然后将目标服务器的响应返回给你。嘿，这样一来，你就能够成功访问外的网站啦！

那么，为什么要使用正向代理呢？哼哼，小编告诉你，正向代理可不仅仅是为了访问被的网站哦！下面，我们来看看正向代理的一些使用场景吧！

Application Scenarios for Forward Proxies

1. Breaking Network Restrictions: Positive proxies can help you access blocked or restricted access sites, like some internal sites on a LAN, or those blocked for political or commercial reasons.

2. Speed up access: When you visit a website, the forward proxy can cache data and pass it to you. This way, if other people are visiting the same site, you can get the data directly from the forward proxy cache, thus speeding up access.

3. Improved security: By using a forward proxy, you can hide your real IP address and identity. This is useful for users who need to protect their privacy. In addition, forward proxies provide additional security by filtering or blocking malicious attacks, viruses and other threats.

So, now that you know the definition and application scenarios of forward proxies, let's see how to use them in your code!

Using forward proxies in code

Okay, students, it's time to learn some real-world practices! Let's take a look at Python as an example of how to make a network request using a forward proxy.

First, we need to import the requests library, if you don't already have it installed, you can use the following command to install it:
“`
pip install requests
“`

Next, let's write a sample code to make a network request using a forward proxy:
"`ipipgothon
import requests

proxy = {"http": "http://代理服务器IP地址:端口号"}

url = "http://目标网站的URL"

response = requests.get(url, proxies=proxy)

print(response.text)
“`

What this code means is that we send a GET request using the IP address and port number of the forward proxy server and print out the response. Isn't it very simple?

However, students should note that you need to replace the "Proxy Server IP Address" and "Port Number" in the above code with the IP address and port number of the actual forward proxy server you are using.

We've finished learning about forward proxies in English and their applications! Through this article, you should now have a more in-depth understanding of forward proxies, and know some of its application scenarios and code examples.