How to enable Access-Control-Allow-Origin in Undertow?

Issue

Try 1

builder.setHandler(new HttpHandler() {
                @Override
                public void handleRequest(final HttpServerExchange exchange) throws Exception {
                    exchange.getResponseHeaders().put(new HttpString("Access-Control-Allow-Origin"), "*");
                    exchange.getResponseHeaders().put(new HttpString("Access-Control-Allow-Methods"),
                            "GET, POST, PUT, DELETE, OPTIONS");
                    String ss = exchange.getResponseHeaders().get(new HttpString("Access-Control-Allow-Headers"))
                            .getFirst();
                    System.out.println(ss);
                    exchange.getResponseHeaders().put(new HttpString("Access-Control-Allow-Headers"), ss);
                }
            });

Try 2

HttpHandler enHandler = new SetHeaderHandler("Access-Control-Allow-Origin", "*");
builder.setHandler(enHandler);

I tried this above settings to enable the CORS in my undertow service, but it not working with my angular UI. works fine in postman.

Solution

it works after adding these line

        ResteasyDeployment rd = new ResteasyDeployment();
        CorsFilter filter = new CorsFilter();
        filter.setAllowedMethods("GET,POST,PUT,DELETE,OPTIONS");
        filter.getAllowedOrigins().add("*");
        rd.setProviderFactory(new ResteasyProviderFactory());
        rd.getProviderFactory().register(filter);

Answered By - vimal prakash