### Question:
StandardHttpPipeline implements HttpHandler { @Override public Eventual<LiveHttpResponse> handle(LiveHttpRequest request, HttpInterceptor.Context context) { HttpInterceptorChain interceptorsChain = new HttpInterceptorChain(interceptors, 0, handler, context, requestTracker); return interceptorsChain.proceed(request); } StandardHttpPipeline(HttpHandler handler);  StandardHttpPipeline(List<HttpInterceptor> interceptors, HttpHandler handler, RequestTracker requestTracker); @Override Eventual<LiveHttpResponse> handle(LiveHttpRequest request, HttpInterceptor.Context context);  }### Answer:
@Test public void sendsExceptionUponMultipleSubscription() { HttpHandler handler = (request, context) -> Eventual.of(response(OK).build()); StandardHttpPipeline pipeline = new StandardHttpPipeline(handler); Eventual<LiveHttpResponse> responseObservable = pipeline.handle(get("/").build(), requestContext()); LiveHttpResponse response = Mono.from(responseObservable).block(); assertThat(response.status(), is(OK)); assertThrows(IllegalStateException.class, () -> Mono.from(responseObservable).block()); }