WWW / WWWForm to post json data

Hello firstly sorry for my bad english , I need help to make my own authentification system for roblox I use roblox auth api : https://auth.roblox.com/docs#!/Authentication/post_v2_login , but I cannot get a valid response from the server. I get an error code 400 "Username and Password are required. Please try again."

I tested following curl command structure it work fine :

Code (CSharp):

1. curl -X POST --header 'Content-Type: application/json' --header 'Accept: application/json' -d '{ \
2.   "ctype": "Username", \
3.   "cvalue": "INeoxz13700", \
4.   "password": "ddddd" \
5. }' 'https://auth.roblox.com/v2/login'

my c# scripts :

Code (CSharp):

1. IEnumerator request()
2.     {
3.         var content = "{ \"ctype\" : \"Username\" , \"cvalue\": \"INeoxz13700\", \"password\" : \"ddddd\"}";
4.  
5.         var encoding = new System.Text.UTF8Encoding();
6.  
7.         var headers = new Hashtable ();
8.  
9.         headers.Add("Content-Type", "application/json");
10.         headers.Add("Accept", "application/json");
11.         headers.Add ("X-CSRF-TOKEN", "sendfalsetokken");
12.  
13.         //Send a request with a bad tokken to get a valid token from roblox system
14.         var request = new WWW ("https://auth.roblox.com/v2/login", encoding.GetBytes (content), headers);
15.  
16.         yield return request;
17.  
18.         //I get a error 403 Token Validation Failed it's logic the token in headers is bad
19.         Debug.Log (request.text);
20.  
21.         //this foreach allow me to recover the token from roblox
22.         foreach(KeyValuePair<string, string> entry in request.responseHeaders)
23.         {
24.             if (entry.Key == "X-CSRF-TOKEN") {
25.                 Tokken = entry.Value;
26.             }
27.         }
28.  
29.         //And finally I resend a new post request with a correct token
30.         headers = new Hashtable();
31.  
32.         headers.Add("Content-Type", "application/json");
33.         headers.Add("Accept", "application/json");
34.         headers.Add ("X-CSRF-TOKEN", Tokken);
35.  
36.  
37.         request = new WWW ("https://auth.roblox.com/v2/login", encoding.GetBytes (content), headers);
38.  
39.         yield return request;
40.  
41.         //And I get a error 400 Username and Password are required. Please try again. I don't know why ...
42.         Debug.Log (request.text);
43.  
44.  
45.         yield break;
46.     }

thanks for your helps .

 

UP !

 

thanks for your answer I finally tested to send Json post request with Java and it's work greatly I get a response code 200 ,do you have any idea ?
why it's not work with Unity web request ??