Access dropbox file - The remote server returned an error: (404) Not Found

[Lukager1]

i'm new in this type of access.
I wrote this code but i have the error in objet to recover the list of files in dropbox.

        Dim token As String
        token = "sl.B6........."
        Dim _command As String
        _command = "https://api.dropboxapi.com/2/files/list_folder"

        Dim Request As HttpWebRequest
        Request = HttpWebRequest.Create(_command)

        Request.Method = "GET"
        Request.KeepAlive = True
        Request.ContentType = "application/x-www-form-urlencoded"
        Request.UserAgent = "Mozilla/5.0 (Windows NT 6.3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/33.0.1750.154 Safari/537.36"
        Request.AllowAutoRedirect = True
        Request.Headers.Add("Authorization", "Bearer " & token)

        ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12

        Dim Response As HttpWebResponse = Request.GetResponse()