REST API 400 Bad Request Parsing Error

Question

I am developing an application for iOS using Xamarin iOS and MonoGame. I want to use alerts using Parse push through their REST API, so I must first create an installation object:

var bundle = new Dictionary<string, object>();
bundle.Add("channels", "");
bundle.Add("deviceType", "ios");
bundle.Add("deviceToken", _deviceToken);

string urlpath = "https://api.parse.com/1/installations";
var httpWebRequest = (HttpWebRequest)WebRequest.Create(urlpath);
httpWebRequest.ContentType = "application/json";
httpWebRequest.Headers.Add("X-Parse-Application-Id", _parseAppID);
httpWebRequest.Headers.Add("X-Parse-REST-API-KEY", _parseRestAPIKey);
httpWebRequest.Method = "POST";
string bundleString = bundle.ToJson();
byte[] buffer = Encoding.GetEncoding("UTF-8").GetBytes(bundleString);
string result = Convert.ToBase64String(buffer);
StreamWriter requestWriter = new StreamWriter(httpWebRequest.GetRequestStream());
requestWriter.Write(result, 0, result.Length);
requestWriter.Close();
WebResponse httpResponse = await httpWebRequest.GetResponseAsync();

Stream stream = httpResponse.GetResponseStream();
string json = string.Empty;

using (StreamReader reader = new StreamReader(stream))
{
    while (!reader.EndOfStream)
    {
        json += reader.ReadLine();
    }
}

JsonObject jsonObject = JsonObject.Parse(json);
_varStorage.Save("ObjectId", jsonObject.Get<string>("objectId"));

BundleString value:

"{\" channels \ ": \" \ "\" DeviceType \ ": \" IOS \ ", \" deviceToken \ ": \" 46becd0a165be042eeab5a1ec96b8858065cbea7311479da16c0fd1c9428e2eb \ "}"

This code throws a System.Net.WebExceptionStatus.ProtocolError 400 "Bad Request" error, and I don't understand why.

Answer 1

,

byte[] buffer = Encoding.GetEncoding("UTF-8").GetBytes(bundleString);

string result = Convert.ToBase64String(buffer);

StreamWriter requestWriter = new StreamWriter(httpWebRequest.GetRequestStream());

requestWriter.Write(result, 0, result.Length);

requestWriter.Flush();

requestWriter.Close();

httpWebRequest.ContentLength = bundleString.Length;

StreamWriter requestWriter = new StreamWriter(httpWebRequest.GetRequestStream());

requestWriter.Write(bundleString);

requestWriter.Flush();

requestWriter.Close();

​​, .

Answer 2

, https://www.parse.com/docs/rest#installations

bundle.Add("channels", new [] { "" });

Answer 3

if you do not call a flash before closing the stream?

requestWriter.Write(result, 0, result.Length);
requestWriter.Close();