Setting cookies with net/http

Question

I\'m trying to set cookies with Go\'s net/http package. I have:

package main

import \"io\"
import \"net/http\"
import \"time\"

func indexHandler(w http.Res         


        

Answer 1

//ShowAllTasksFunc is used to handle the "/" URL which is the default ons
func ShowAllTasksFunc(w http.ResponseWriter, r *http.Request){
    if r.Method == "GET" {
        context := db.GetTasks("pending") //true when you want non deleted notes
        if message != "" {
            context.Message = message
        }
        context.CSRFToken = "abcd"
        message = ""
        expiration := time.Now().Add(365 * 24 * time.Hour)
        cookie    :=    http.Cookie{Name: "csrftoken",Value:"abcd",Expires:expiration}
        http.SetCookie(w, &cookie)
        homeTemplate.Execute(w, context)
    } else {
        message = "Method not allowed"
        http.Redirect(w, r, "/", http.StatusFound)
    }
}

There is a basic difference between Requests and ResponseWriter, a Request is what a browser will send like

Host: 127.0.0.1:8081
User-Agent: ...
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
DNT: 1
Referer: http://127.0.0.1:8081/
Cookie: csrftoken=abcd
Connection: keep-alive

and a response is what the handler will send, something like :

Content-Type: text/html; charset=utf-8
Date: Tue, 12 Jan 2016 16:43:53 GMT
Set-Cookie: csrftoken=abcd; Expires=Wed, 11 Jan 2017 16:43:53 GMT
Transfer-Encoding: chunked
...

When the browser will make a request, it'll include the cookie for that domain, since cookies are stored domain wise and can't be accessed from cross domains, if you set a cookie as HTTP only then it can only be accessed from the website which set it via HTTP and not via JS.

So when getting information from cookies you can do that from the r.Cookie method, like this

cookie, _ := r.Cookie("csrftoken")
if formToken == cookie.Value {

https://github.com/thewhitetulip/Tasks/blob/master/views/addViews.go#L72-L75

But when you are going to set a cookie, you have to do it in the response writer method, the request is a read only object which we respond to, think of it as a text message you get from someone, that is a request, you can only get it, what you type is a response, so you can type in a cookie at

for more details: https://thewhitetulip.gitbooks.io/webapp-with-golang-anti-textbook/content/content/2.4workingwithform.html