How Can I Correctly Set Cookies Using Go's net/http Package?

Setting Cookies with Net/HTTP from the Server

This article addresses the issue of setting cookies in Go using the net/http package. Upon encountering difficulties, you may have resorted to online searches but yielded unsatisfactory results.

Let's delve into the code you provided:

package main

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

func indexHandler(w http.ResponseWriter, req *http.Request) {
    expire := time.Now().AddDate(0, 0, 1)
    cookie := http.Cookie{"test", "tcookie", "/", "www.domain.com", expire, expire.Format(time.UnixDate), 86400, true, true, "test=tcookie", []string{"test=tcookie"}}
    req.AddCookie(&cookie)
    io.WriteString(w, "Hello world!")
}

func main() {
    http.HandleFunc("/", indexHandler)
    http.ListenAndServe(":80", nil)
}

As highlighted in the response you received, you seem to be setting the cookie on the request rather than the response. For this purpose, net/http provides a method called SetCookie:

func SetCookie(w ResponseWriter, cookie *Cookie)

To set a cookie, you should use the SetCookie function as follows:

func indexHandler(w http.ResponseWriter, req *http.Request) {
    expire := time.Now().AddDate(0, 0, 1)
    cookie := http.Cookie{
        Name:    "test",
        Value:   "tcookie",
        Path:    "/",
        Domain:  "www.domain.com",
        Expires: expire,
        MaxAge:  86400, // duration in seconds.
        Secure:  true,
        HttpOnly: true,
    }
    http.SetCookie(w, &cookie)
    io.WriteString(w, "Hello world!")
}

By setting the cookie on the response, the browser will receive the cookie and store it accordingly. This will enable you to track user sessions and provide personalized experiences in your web application.

The above is the detailed content of How Can I Correctly Set Cookies Using Go's net/http Package?. For more information, please follow other related articles on the PHP Chinese website!