public void email_register()
    {
        StartCoroutine(POST());
    }

    public WWW POST()
    {
        WWW www;
        var postHeader = new Hashtable();
        postHeader.Add("Content-Type", "application/json");
        var form = new WWWForm();
        form.AddField("email", "vasia@gmail.com");
        form.AddField("username", "vasia");
        form.AddField("registered_via", "0");
        byte[] rawData = form.data;

        www = new WWW(link_base, rawData, postHeader);

        StartCoroutine(WaitForRequest(www));
        return www;
    }
    IEnumerator WaitForRequest(WWW data)
    {
        yield return data; // Wait until the download is done
        if (data.error != null)
        {
            Debug.Log("There was an error sending request: " + data.error);
        }
        else
        {
            Debug.Log("WWW Request: " + data.text);
        }
    }