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How to Handle HTTP POST Requests with Cookies in Go?

Patricia Arquette
Release: 2024-12-27 22:01:11
Original
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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)
}
Copy after login

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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