How to use HTTP proxy in Go?

Go is a popular programming language that can be used to build a variety of different types of web applications. Among them, using HTTP proxy is one of the very common application scenarios. In this article, we will explore how to use HTTP proxy in Go.

What is HTTP proxy?

HTTP proxy is an application that allows users to send HTTP/HTTPS requests through a proxy server. Typically, a proxy server sits between the user and the target server and can cache requests, restrict users from accessing certain content, and more. Using HTTP proxy has many advantages, such as effectively reducing network bandwidth usage and improving response speed.

How to use HTTP proxy in Go?

Using HTTP proxy in Go is very simple. Here are some basic steps for implementing an HTTP proxy:

1. Create an HTTP client

In Go, you can use http.Client to create one An HTTP client that will be used to send HTTP requests. For example:

client := &http.Client{}

2. Create a proxy server

The "net/http" package in the Go standard library provides a convenient way to create a proxy server. For example:

proxy := func(_ *http.Request) (*url.URL, error) {
    return url.Parse("http://<proxy-url>:<port>")
}

transport := &http.Transport{
    Proxy: proxy,
}

client := &http.Client{
    Transport: transport,
}

In the above example, we first created a function named proxy, which will return the URL of the proxy server. We then created an HTTP transport object using the http.Transport type and passed the proxy function to the Proxy property of the object. Finally, we pass http.Transport to the Transport property of the HTTP client in order to connect to the proxy server.

3. Send HTTP request

To use the proxy server to send HTTP requests, you only need to use the client you just created. For example:

resp, err := client.Get("http://www.example.com")

In the above example, we used the client object to send a GET request and accessed a website named "www.example.com". Since we have set up an HTTP proxy server, the request will be forwarded through the proxy server.

To sum up, using HTTP proxy is very simple in Go. Just create an HTTP client using the http.Client type, then set the proxy server via the http.Transport type and pass it to the HTTP client. Finally, use the client object to send an HTTP request to complete the proxy access.

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