How to handle HTTP redirection in Golang?

When handling HTTP redirects in Go, you need to understand the following redirect types: 301 Move Permanent 302 Found 303 View Others Redirects can be handled through the http.Client type and Do method in the net/http package, and through the automatic Define the CheckRedirect function to track redirects.

Handling HTTP Redirects in Go

HTTP redirect is a server response code that indicates that the client needs to redirect to a different Send a new request to the location. Handling redirects is critical when building web services to ensure a smooth user experience.

Understanding HTTP redirection types

There are several types of HTTP redirection, the most common ones are:

• 301 Mobile Permanent: Indicates that the resource has been permanently moved to a new location.
• 302 Found: Indicates that the resource has been temporarily moved to a new location.
• 303 View Other: Indicates that the client should use an alternative request method (such as GET) to access the original location.

Handling Redirects with Go

In Go, you can handle redirects through the net/http package. The http.Client type provides a Do method that performs HTTP requests and follows redirects.

Practical case

In the following Go code, we demonstrate how to handle redirects and get the final HTTP response:

package main

import (
    "fmt"
    "net/http"
)

func main() {
    // 创建一个新的 HTTP 客户端
    client := &http.Client{
        // 启用重定向跟踪
        CheckRedirect: func(req *http.Request, via []*http.Request) error {
            return nil
        },
    }

    // 对带重定向的网址发出请求
    resp, err := client.Get("http://example.com/redirect")
    if err != nil {
        // 处理错误
        fmt.Println(err)
    }

    // 打印最终响应的状态代码
    fmt.Println(resp.StatusCode)
}

In this In this case, we created a custom CheckRedirect function that allows the Do method to follow all redirects. This way we can get the final HTTP response even if it involves multiple redirects.

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