If ServletInputStream readListener onError resumes exception, server returns HTTP 200

@Path("")
public class ResourceInfoInjectionResource {
    @Context
    private HttpServletRequest request;

    @POST
    @Path("a")
    public void a(@Suspended final AsyncResponse async) throws IOException {
        final ServletInputStream inputStream = request.getInputStream();

        inputStream.setReadListener(new ReadListener() {
            @Override
            public void onDataAvailable() throws IOException {
                throw new java.lang.IllegalStateException("a exception");
            }

            @Override
            public void onAllDataRead() throws IOException {
            }

            @Override
            public void onError(Throwable t) {
                async.resume(t);
            }
        });
    }

    @GET
    @Path("/b")
    public void b(@Suspended final AsyncResponse response) {
        new Thread() {
            public void run() {
                try {
                    Thread.sleep(5000);
                    response.resume(new IllegalStateException("b exception"));
                } catch (Exception e) {
                    throw new RuntimeException(e);
                }
            }
        }.start();
    }
}