assertIllegalStateException(() -> resp.drainHandler(noOpHandler()));
assertIllegalStateException(() -> resp.end());
assertIllegalStateException(() -> resp.end("foo"));
assertIllegalStateException(() -> resp.end(buff));
assertIllegalStateException(() -> resp.end("foo", "UTF-8"));
assertIllegalStateException(() -> resp.exceptionHandler(noOpHandler()));
assertIllegalStateException(() -> resp.setChunked(false));
assertIllegalStateException(() -> resp.setWriteQueueMaxSize(123));
assertIllegalStateException(() -> resp.write(buff));
assertIllegalStateException(() -> resp.write("foo"));
assertIllegalStateException(() -> resp.write("foo", "UTF-8"));