Let's talk about how to use golang cookiejar

In golang, there are many convenient libraries that can help us with http requests, cookie management and other operations. Among them, cookies are a commonly used concept, which can help us maintain login status between different http requests and record user habits and other information. In this article, we will introduce how to use cookiejar in the golang standard library to manage cookies.

What is cookiejar?

Cookiejar is a data structure in the golang standard library, used to store and manage cookies. cookiejar implements the http.CookieJar interface, which can share cookies between different http requests, maintain login status, etc.

Cookiejar usage steps

1. Import the net/http/cookiejar package in the standard library:

import "net/http/cookiejar"

2. Create a cookiejar instance:

cookieJar, _ := cookiejar.New(nil)

3. Create http.Client instance and set cookiejar:

httpClient := &http.Client{
    Jar: cookieJar,
}

4. Send http request:

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

5. In subsequent http requests, httpClient will automatically use the cookies stored in cookiejar:

resp, err := httpClient.Get("http://example.com/profile")

6. You can manually add cookies through the SetCookies method of cookiejar:

url, _ := url.Parse("http://example.com")
cookie := &http.Cookie{Name: "myCookie", Value: "myValue"}
cookieJar.SetCookies(url, []*http.Cookie{cookie})

7. You can use the Cookies method of cookiejar to obtain all cookies:

cookies := cookieJar.Cookies(url)
for _, cookie := range cookies {
    fmt.Printf("Cookie %s:%s\n", cookie.Name, cookie.Value)
}

Full code:

import (
    "fmt"
    "net/http"
    "net/http/cookiejar"
)

func main() {
    // 创建cookiejar实例
    cookieJar, _ := cookiejar.New(nil)

    // 创建http.Client实例，并设置cookiejar
    httpClient := &http.Client{
        Jar: cookieJar,
    }

    // 发送http请求
    resp, err := httpClient.Get("http://example.com")
    if err != nil {
        fmt.Println(err)
        return
    }
    resp.Body.Close()

    // 在之后的http请求中，会自动使用cookiejar中的cookie
    resp2, err := httpClient.Get("http://example.com/profile")
    if err != nil {
        fmt.Println(err)
        return
    }
    resp2.Body.Close()

    // 手动添加cookie
    url, _ := url.Parse("http://example.com")
    cookie := &http.Cookie{Name: "myCookie", Value: "myValue"}
    cookieJar.SetCookies(url, []*http.Cookie{cookie})

    // 获取所有cookie
    cookies := cookieJar.Cookies(url)
    for _, cookie := range cookies {
        fmt.Printf("Cookie %s:%s\n", cookie.Name, cookie.Value)
    }
}

The above is how to use cookiejar in golang. I hope it will be helpful to you. In actual development, cookiejar can help us manage cookies conveniently, making http requests more flexible and controllable.

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