WARNING: Addition of the standard header "Pragma" is discouraged

[pavelhoral]

Accessing some REST endpoints (e.g. OAuth2) ends up logging the following warning:

Aug 26, 2025 12:38:52 PM org.restlet.engine.header.HeaderUtils addExtensionHeaders
WARNING: Addition of the standard header "Pragma" is discouraged as a future version of the Restlet API will directly support it.

This clutters the log which is undesirable behavior. I did place breakpoint where the warning is being logged while accessing /oauth2/authorize to get the following stack trace:

Details

Thread [http-nio-8080-exec-5] (Suspended (breakpoint at line 148 in HeaderUtils))	
	HeaderUtils.addExtensionHeaders(Series<Header>, Series<Header>) line: 148	
	HeaderUtils.addResponseHeaders(Response, Series<Header>) line: 474	
	ServletServerAdapter(ServerAdapter).addResponseHeaders(HttpResponse) line: 63	
	ServletServerAdapter(ServerAdapter).commit(HttpResponse) line: 140	
	HttpServerHelper.handle(ServerCall) line: 119	
	RestletServiceServlet(ServerServlet).service(HttpServletRequest, HttpServletResponse) line: 1072	
	RestEndpointServlet.service(HttpServletRequest, HttpServletResponse) line: 130	
	RestEndpointServlet(HttpServlet).service(ServletRequest, ServletResponse) line: 710	
	ApplicationFilterChain.doFilter(ServletRequest, ServletResponse) line: 130	
	WsFilter.doFilter(ServletRequest, ServletResponse, FilterChain) line: 53	
	ApplicationFilterChain.doFilter(ServletRequest, ServletResponse) line: 109	
	ResponseValidationFilter.doFilter(ServletRequest, ServletResponse, FilterChain) line: 44	
	ApplicationFilterChain.doFilter(ServletRequest, ServletResponse) line: 109	
	SetHeadersFilter.doFilter(ServletRequest, ServletResponse, FilterChain) line: 88	
	ApplicationFilterChain.doFilter(ServletRequest, ServletResponse) line: 109	
	FQDNValidationFilter.doFilter(ServletRequest, ServletResponse, FilterChain) line: 63	
	ApplicationFilterChain.doFilter(ServletRequest, ServletResponse) line: 109	
	AMSetupFilter.doFilter(ServletRequest, ServletResponse, FilterChain) line: 111	
	ApplicationFilterChain.doFilter(ServletRequest, ServletResponse) line: 109	
	AuditContextFilter.doFilter(ServletRequest, ServletResponse, FilterChain) line: 51	
	ApplicationFilterChain.doFilter(ServletRequest, ServletResponse) line: 109	
	StandardWrapperValve.invoke(Request, Response) line: 167	
	StandardContextValve.invoke(Request, Response) line: 79	
	NonLoginAuthenticator(AuthenticatorBase).invoke(Request, Response) line: 483	
	StandardHostValve.invoke(Request, Response) line: 116	
	ErrorReportValve.invoke(Request, Response) line: 93	
	AccessLogValve(AbstractAccessLogValve).invoke(Request, Response) line: 666	
	StandardEngineValve.invoke(Request, Response) line: 74	
	CoyoteAdapter.service(Request, Response) line: 343	
	Http11Processor.service(SocketWrapperBase<?>) line: 396	
	Http11Processor(AbstractProcessorLight).process(SocketWrapperBase<?>, SocketEvent) line: 63	
	AbstractProtocol$ConnectionHandler<S>.process(SocketWrapperBase<S>, SocketEvent) line: 903	
	NioEndpoint$SocketProcessor.doRun() line: 1773	
	NioEndpoint$SocketProcessor(SocketProcessorBase<S>).run() line: 52	
	ThreadPoolExecutor.runWorker(ThreadPoolExecutor$Worker) line: 1149	
	ThreadPoolExecutor$Worker.run() line: 637	
	TaskThread$WrappingRunnable.run() line: 59	
	TaskThread(Thread).runWith(Object, Runnable) line: 1596	
	TaskThread(Thread).run() line: 1583	

[pavelhoral]

Simple workaround for this issue is to make Restlet log through SLF4J, which in turn sends the log through AM's Debug Service (default level is ERROR, so the message gets dropped):

-Dorg.restlet.engine.loggerFacadeClass=org.restlet.ext.slf4j.Slf4jLoggerFacade