Attempt to fix 'isReady' error

java.lang.IllegalStateException: isReady() not called
	at org.eclipse.jetty.server.HttpOutput.flush(HttpOutput.java:189)
	at perf.test.TestCaseAServlet$2.call(TestCaseAServlet.java:84)
	at perf.test.TestCaseAServlet$2.call(TestCaseAServlet.java:74)
	at rx.util.functions.Functions$3.call(Functions.java:76)
	at rx.operators.OperationZip$Aggregator.next(OperationZip.java:311)
	at rx.operators.OperationZip$ZipObserver.onNext(OperationZip.java:193)
	at rx.operators.SynchronizedObserver.onNext(SynchronizedObserver.java:106)
	at rx.operators.OperationMerge$MergeObservable$ChildObserver.onNext(OperationMerge.java:285)
	at rx.operators.OperationToObservableIterable$ToObservableIterable.onSubscribe(OperationToObservableIterable.java:55)
	at rx.Observable.subscribe(Observable.java:205)