How to manage HTTP cookies using Golang?

Methods to use Golang to manage HTTP Cookies are: Set Cookie: Use http.Cookie to set its name, value, expiration time, domain, path, security flag and HttpOnly flag, and then use http.SetCookie() to add it to the response header. . Get a Cookie: Use r.Cookie() to get a cookie with a specific name, whose value can then be accessed using its Value field. Deleting the cookie: After retrieving the cookie, setting its Expires field to a time in the past and adding it to the response header will delete the cookie from the client browser.

#How to use Golang to manage HTTP Cookies?

The common way to manage HTTP cookies in Golang is to use the API provided by the net/http package. Here are the steps on how to set, get and delete HTTP cookies:

Set Cookie

package main

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

func main() {
    http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
        // 设置名为 "session_id" 的 cookie，并将它的值设置为 "some-uuid"
        cookie := &http.Cookie{
            Name: "session_id",
            Value: "some-uuid",
        }
        // 设置 cookie 的过期时间
        cookie.Expires = time.Now().Add(24 * time.Hour)
        // 设置 cookie 的域（默认为当前请求的域）
        cookie.Domain = "example.com"
        // 设置 cookie 的路径（默认为 "/"）
        cookie.Path = "/"
        // 设置 cookie 的安全标志（默认为 false）
        cookie.Secure = true
        // 设置 cookie 的 HttpOnly 标志（默认为 false）
        cookie.HttpOnly = true

        // 将 cookie 添加到响应头上
        http.SetCookie(w, cookie)
        fmt.Fprint(w, "Cookie set successfully")
    })

    http.ListenAndServe(":8080", nil)
}

Get Cookie

package main

import (
    "fmt"
    "net/http"
)

func main() {
    http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
        // 获取名为 "session_id" 的 cookie
        cookie, err := r.Cookie("session_id")
        if err != nil {
            fmt.Fprint(w, "Cookie not found")
            return
        }

        // 打印 cookie 的值
        fmt.Fprint(w, "Cookie value:", cookie.Value)
    })

    http.ListenAndServe(":8080", nil)
}

Delete Cookie

package main

import (
    "fmt"
    "net/http"
)

func main() {
    http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
        // 获取名为 "session_id" 的 cookie
        cookie, err := r.Cookie("session_id")
        if err != nil {
            fmt.Fprint(w, "Cookie not found")
            return
        }

        // 设置 cookie 的过期时间为过去，从而删除它
        cookie.Expires = time.Now().Add(-1 * time.Second)

        // 将 cookie 添加到响应头上
        http.SetCookie(w, cookie)
        fmt.Fprint(w, "Cookie deleted successfully")
    })

    http.ListenAndServe(":8080", nil)
}

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