public string SendAsync()
        {
            var task = (Task)HttpMessageHandlerIntegration.HttpMessageHandler_SendAsync(
                Handler,
                HttpRequest,
                BoxedCancellationToken,
                (int)OpCodeValue.Callvirt,
                MdToken,
                (long)GuidPtr);

            task.GetAwaiter().GetResult();
            return("OK");
        }
        public async Task <string> SendAsync()
        {
            var task = (Task)HttpMessageHandlerIntegration.HttpMessageHandler_SendAsync(
                Handler,
                HttpRequest,
                BoxedCancellationToken,
                (int)OpCodeValue.Callvirt,
                MdToken,
                (long)GuidPtr);

            await task;

            return("OK");
        }