clientErrorInterceptors = new CopyOnWriteArrayList<ClientErrorInterceptor>();
builtinsRegistered = false;
registerBuiltins = true;
injectorFactory = new InjectorFactoryImpl();
registerDefaultInterceptorPrecedences();
addHeaderDelegate(MediaType.class, new MediaTypeHeaderDelegate());
addHeaderDelegate(NewCookie.class, new NewCookieHeaderDelegate());
addHeaderDelegate(Cookie.class, new CookieHeaderDelegate());
addHeaderDelegate(URI.class, new UriHeaderDelegate());