private HttpJsonRequest(Uri url, RequestMethod method, JObject metadata, ICredentials credentials)
{
webRequest = WebRequest.Create(url) as HttpWebRequest;
webRequest.Credentials = credentials;
WriteMetadata(metadata);
webRequest.Method = method.GetName();
switch (method)
{
case RequestMethod.POST:
webRequest.ContentType = "application/json; charset=utf-8";
break;
default:
break;
}
}