web request by client, sending cookies to server

CreateWebRequest.cs

      private HttpWebRequest CreateWebRequest(ApiCommands cmd, List<string> restParams, bool post = false)
      {
         var url = new StringBuilder();
         url.AppendFormat("http://localhost:8080/api/v1/{0}", cmd);
         if (restParams != null)
         {
            restParams.ForEach(x => url.AppendFormat("/{0}", x));
         }
         var request = (HttpWebRequest)WebRequest.Create(url.ToString());
         request.ContentType = "application/json";
         request.Method = post ? "POST" : "GET";
         
         // include any cookies that we've received from the server
         lock (_mutex)
         {
            if (_cookies.Any())
            {
               request.CookieContainer = new CookieContainer();
               foreach (var x in _cookies)
               {
                  request.CookieContainer.Add(new Uri("http://localhost"), new Cookie(x.Name, x.Value));
               }
            }
         }

         textBoxSendJson.Text = "";
         textBoxSendUrl.Text = string.Format("{0} {1}", request.Method, url);

         return request;
      }