/// <summary>
 /// Initializes a new instance of the <see cref="NetworkRequestCallback"/> class.
 /// </summary>
 /// <param name="request">
 /// The network request.
 /// </param>
 /// <param name="successCallback">
 /// The success callback.
 /// </param>
 public NetworkRequestCallback(NetworkRequest request, WeakReferenceCallback successCallback)
     : this(request, successCallback, null)
 {
 }
 /// <summary>
 /// Initializes a new instance of the <see cref="NetworkRequestCallback"/> class.
 /// </summary>
 /// <param name="request">
 /// The network request.
 /// </param>
 public NetworkRequestCallback(NetworkRequest request)
     : this(request, null, null)
 {
 }