private static void attachCallbackChecks(RequestLogAccess log) {
            final Runnable runnable = () -> {
                callbackThreads.add(Thread.currentThread());
            };
            log.whenRequestComplete().thenRun(runnable);
            log.whenComplete().thenRun(runnable);
        }
Creates a new instance that decorates the specified {@link HttpClient}.
core/src/test/java/com/linecorp/armeria/client/ContextCancellationTest.java