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

Setting Cookies with Go's net/http from the Server

Setting cookies with Go's net/http package can be a straightforward task. However, a common pitfall is attempting to set cookies on the request object, rather than the response.

Implementation

Here's how you can correctly set a cookie using net/http:

package main

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

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,
        RawExpires:  expire.Format(time.UnixDate),
        MaxAge:     86400,
        Secure:     true,
        HttpOnly:   true,
        SameSite:    http.SameSiteStrictMode,
        Raw:          "test=tcookie",
        Unparsed: []string{"test=tcookie"},
    }

    http.SetCookie(w, cookie) // Set the cookie on the response
    fmt.Fprint(w, "Hello world!")
}

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

Explanation

In this example:

• http.SetCookie(w, cookie) is used to add the cookie to the response.
• The cookie is configured with various attributes, such as name, value, path, domain, expiration, and security settings.
• fmt.Fprint(w, "Hello world!") sends the response to the client, including the set cookie.

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