How to Follow Redirections with Cookies in Go?

Following Redirections with Cookies in Go

In handling HTTP requests, it's common to encounter redirects that carry cookies. This poses a challenge when using Golang, as the default behavior is to drop cookies during redirects. To overcome this, you can utilize the net/http/cookiejar package, introduced in Go 1.1.

With the cookiejar package, you can configure a client to automatically follow redirects while preserving the received cookies. To achieve this:

1. Create a cookiejar.Jar to store the received cookies.
2. Set the cookiejar.Jar as the Jar field of an http.Client instance.
3. Use the modified client to make HTTP requests.

Here's an illustrative example:

<code class="go">package main

import (
    "golang.org/x/net/publicsuffix"
    "io/ioutil"
    "log"
    "net/http"
    "net/http/cookiejar"
)

func main() {
    options := cookiejar.Options{
        PublicSuffixList: publicsuffix.List,
    }
    jar, err := cookiejar.New(&options)
    if err != nil {
        log.Fatal(err)
    }
    client := http.Client{Jar: jar}
    resp, err := client.Get("http://dubbelboer.com/302cookie.php")
    if err != nil {
        log.Fatal(err)
    }
    data, err := ioutil.ReadAll(resp.Body)
    resp.Body.Close()
    if err != nil {
        log.Fatal(err)
    }
    log.Println(string(data))
}</code>

By using this approach, your Go client will automatically follow redirects and maintain the received cookies, similar to the behavior in cURL when setting COOKIEFILE, AUTOREFERER, and FOLLOWLOCATION.

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