private T GetWebChannel<T>(string endpointPath, string user, string pass, bool corsEnabled = false)
        {
            var endpoint = new ServiceEndpoint(ContractDescription.GetContract(typeof(T)))
            {
                Address = new EndpointAddress(endpointPath),
                Binding = new WebHttpBinding()
                {
                    MaxReceivedMessageSize = 500000000,
                    ReceiveTimeout = TimeSpan.FromMinutes(20),
                    SendTimeout = TimeSpan.FromMinutes(20),
                    OpenTimeout = TimeSpan.FromMinutes(20),
                    CloseTimeout = TimeSpan.FromMinutes(20),
                    TransferMode = TransferMode.Buffered,
                    MaxBufferSize = 500000000,
                    MaxBufferPoolSize = 500000000,
                    Security = new WebHttpSecurity()
                    {
                        Mode = WebHttpSecurityMode.TransportCredentialOnly,
                        Transport = new HttpTransportSecurity()
                        {
                            ClientCredentialType = HttpClientCredentialType.Ntlm
                        }
                    }
                }
            };
            endpoint.EndpointBehaviors.Add(new WebHttpBehavior());
            if (corsEnabled)
                endpoint.EndpointBehaviors.Add(new EnableCrossOriginResourceSharingBehavior());

            var factory = new ChannelFactory<T>(endpoint);
            factory.Credentials.Windows.AllowedImpersonationLevel = System.Security.Principal.TokenImpersonationLevel.Impersonation;
            if (!string.IsNullOrEmpty(user) && !string.IsNullOrEmpty(pass))
            {
                factory.Credentials.Windows.ClientCredential.UserName = user;
                factory.Credentials.Windows.ClientCredential.Password = pass;
            }
            return factory.CreateChannel();
        }