Работа с Dropbox через HTTP (GET/POST)

        var httpWebRequest = (HttpWebRequest)WebRequest.Create("https://api.dropboxapi.com/2/users/get_space_usage");
        httpWebRequest.Method = "POST";
        httpWebRequest.Headers.Add("Authorization", accessToken);
        var httpResponse = (HttpWebResponse)httpWebRequest.GetResponse();
 
        using (var streamReader = new StreamReader(httpResponse.GetResponseStream()))
        {
            Console.WriteLine(streamReader.ReadToEnd()); 
        }

httpWebRequest.Headers.Add("User", "Agent");

 var req = (HttpWebRequest)WebRequest.Create(...);
 req.UserAgent = "MyUserAgent";

var req = (HttpWebRequest)WebRequest.Create(...);
 req.UserAgent = "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/48.0.2564.116 Safari/537.36";

var httpWebRequest = (HttpWebRequest)WebRequest.Create("https://api.dropboxapi.com/2/users/get_current_account");
        httpWebRequest.Method = "POST";
        httpWebRequest.Headers.Add("Authorization: Bearer " + accessToken);
        var httpResponse = (HttpWebResponse)httpWebRequest.GetResponse();
 
        using (var streamReader = new StreamReader(httpResponse.GetResponseStream()))
        {
            Console.WriteLine(streamReader.ReadToEnd()); 
        }