C# REST client using legacy code, HttpWebRequest

RestClient.cs

JObject jObjectbody = new JObject();
jObjectbody.Add("label", item.PlateNo);
jObjectbody.Add("asset", item.AssetCode);
jObjectbody.Add("rfid", item.RFID);

var baseAddress = $"http://xx.xx.xx.xx/casper/api/FCS/SecondaryTag?key={userModel.Session}";

var http = (HttpWebRequest)WebRequest.Create(new Uri(baseAddress));
http.Accept = "application/json";
http.ContentType = "application/json";
http.Method = "POST";

string parsedContent = jObjectbody.ToString();
ASCIIEncoding encoding = new ASCIIEncoding();
Byte[] bytes = encoding.GetBytes(parsedContent);

Stream newStream = http.GetRequestStream();
newStream.Write(bytes, 0, bytes.Length);
newStream.Close();

var response = http.GetResponse();

var stream = response.GetResponseStream();
var sr = new StreamReader(stream);
var content = sr.ReadToEnd();