Golang : Storing cookies in http.CookieJar example
Cookie can be useful for storing data and to be retrieved later on to fill in form values such as username, address or other hidden parameters that a server might need. For this tutorial, we will explore how to store values into a cookies jar and when the client(usually a browser) encounter the URL the cookies are associated with, the values will be utilized back.
The code below simulate an event where the user visited back youtube.com and the cookies values are reused back.
package main
import (
"fmt"
"io/ioutil"
"net/http"
"net/http/cookiejar"
"net/url"
"strings"
)
func main() {
jar, _ := cookiejar.New(nil)
var cookies []*http.Cookie
firstCookie := &http.Cookie{
Name: "PREF",
Value: "f1=50000000&f5=30",
Path: "/",
Domain: ".youtube.com",
}
cookies = append(cookies, firstCookie)
secondCookie := &http.Cookie{
Name: "VISITOR_INFO1_LIVE",
Value: "Luy_gz784rQ",
Path: "/",
Domain: ".youtube.com",
}
cookies = append(cookies, secondCookie)
thirdCookie := &http.Cookie{
Name: "YSC",
Value: "9jGyTn_JiBk",
Path: "/",
Domain: ".youtube.com",
}
cookies = append(cookies, thirdCookie)
fourthCookie := &http.Cookie{
Name: "dkv",
Value: "19a17a80fd703efd450d5ef9dadc32cee3QEAAAAdGxpcGn9mTBVMA==",
Path: "/",
Domain: ".youtube.com",
}
cookies = append(cookies, fourthCookie)
// URL for cookies to remember. i.e reply when encounter this URL
cookieURL, _ := url.Parse("https://www.youtube.com/results?search_query=")
jar.SetCookies(cookieURL, cookies)
// sanity check
fmt.Println(jar.Cookies(cookieURL))
//setup our client based on the cookies data
client := &http.Client{
Jar: jar,
}
urlData := url.Values{}
urlData.Set("search_query", "macross")
req, _ := http.NewRequest("POST", "https://www.youtube.com/results?search_query=", strings.NewReader(urlData.Encode()))
req.Header.Add("Content-Type", "application/x-www-form-urlencoded")
resp, err := client.Do(req)
if err != nil {
panic(nil)
}
body, _ := ioutil.ReadAll(resp.Body)
resp.Body.Close()
// display content to screen ... save this to a HTML file and view the file with browser ;-)
fmt.Println(string(body))
}
NOTE : If you are using Google Chrome browser, go to Views->Developer->Developer Tools and under the Resources tab, you should see Cookies->www.youtube.com. The cookies values use in the example above are taken from there.
Reference :
See also : Golang : Drop cookie to visitor's browser and http.SetCookie() example
By Adam Ng
IF you gain some knowledge or the information here solved your programming problem. Please consider donating to the less fortunate or some charities that you like. Apart from donation, planting trees, volunteering or reducing your carbon footprint will be great too.
Advertisement
Tutorials
+31k Golang : Download file example
+18.3k Golang : Check if a directory exist or not
+21.1k Golang : Underscore or snake_case to camel case example
+7.7k Golang : How to handle file size larger than available memory panic issue
+12.3k Golang : Sort and reverse sort a slice of runes
+36.9k Golang : Display float in 2 decimal points and rounding up or down
+10.1k Golang : ffmpeg with os/exec.Command() returns non-zero status
+13.7k Golang : Read XML elements data with xml.CharData example
+27k Golang : Convert file content into array of bytes
+39.3k Golang : How to iterate over a []string(array)
+17.8k Convert JSON to CSV in Golang
+20.4k Golang : Compare floating-point numbers