microsoft-azure-storage/src/com/microsoft/azure/storage/core/ExecutionEngine.java
private static void fireSendingRequestEvent(OperationContext opContext, HttpURLConnection request,
            RequestResult result) {
        if (opContext.getSendingRequestEventHandler().hasListeners()
                || OperationContext.getGlobalSendingRequestEventHandler().hasListeners()) {
            SendingRequestEvent event = new SendingRequestEvent(opContext, request, result);
            opContext.getSendingRequestEventHandler().fireEvent(event);
            OperationContext.getGlobalSendingRequestEventHandler().fireEvent(event);
        }
    }
private static void fireSendingRequestEvent(OperationContext opContext, HttpURLConnection request,
            RequestResult result) {
        if (opContext.getSendingRequestEventHandler().hasListeners()
                || OperationContext.getGlobalSendingRequestEventHandler().hasListeners()) {
            SendingRequestEvent event = new SendingRequestEvent(opContext, request, result);
            opContext.getSendingRequestEventHandler().fireEvent(event);
            OperationContext.getGlobalSendingRequestEventHandler().fireEvent(event);
        }
    }
Fires events representing that a request will be sent.