How to Handle HTTP POST Requests with Cookies in Go?

Go: HTTP Post with Cookies

In Go, managing cookies for HTTP requests can be achieved using the cookiejar package introduced in Go 1.1. By creating a CookieJar and associating it with an HTTP client, cookies can be automatically stored and retrieved for subsequent requests.

Example Code

Here's an example of how to log into a website, store the cookies, and access another page using the stored cookies:

package main

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

func main() {
    // Create a new cookie jar.
    jar, err := cookiejar.New(nil)
    if err != nil {
        panic(err)
    }

    // Create an HTTP client that uses the cookie jar.
    client := &http.Client{
        Jar: jar,
    }

    // Login to the website.
    loginPostUrl := "http://www.example.com/login"
    values := url.Values{}
    values.Set("username", "my_username")
    values.Set("password", "my_password")
    resp, err := client.PostForm(loginPostUrl, values)
    if err != nil {
        panic(err)
    }
    defer resp.Body.Close()

    // View the user's bill.
    viewBillUrl := "http://www.example.com/my/bill"
    resp, err = client.Get(viewBillUrl)
    if err != nil {
        panic(err)
    }
    defer resp.Body.Close()

    // Read the bill's contents.
    billContents, err := resp.Body.ReadString('\n')
    if err != nil {
        panic(err)
    }

    fmt.Println(billContents)
}

In this example, the CookieJar is used to automatically store the cookies returned by the login request. These cookies are then used to authorize the subsequent request to the /my/bill page.

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