Spring Rest API interceptor add response header on each/every request

Question

I am working with Spring 4 REST API annotation based configuration application. I want to add response header on each/every request once user is authenticate by JWT. I have created interceptor for that which looks as below:

public class AuthenticateInterceptor implements HandlerInterceptor {

@Override
public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object object, Exception arg3)
        throws Exception {
    response.addHeader("afterCompletion", "afterCompletion header");
    response.setHeader("afterCompletion", "afterCompletion header");
    System.out.println("************** afterCompletion **************");
}

@Override
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object object,
        ModelAndView modelAndView) throws Exception {
    response.addHeader("postHandle", "postHandle header");

    System.out.println("************** postHandle **************");
}

@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object object) throws Exception {
    System.out.println("************** preHandle **************");

    return true;
  }
}

My interceptor configuration is as below:

@Configuration
public class AdapterConfig extends WebMvcConfigurerAdapter {

@Override
public void addInterceptors(InterceptorRegistry registry) {
    registry.addInterceptor(new AuthenticateInterceptor());
  }

}

When I get JSON response I am not able the see the added header value which are added from interceptor. Any one help me what is the issue and how can I add header from interceptor for each/every request.

Answer 1

I didn't succeed in interceptors, Instead using Filters or WebFilter perfectly works:

@Component
public class ResponseHeaderWebFilter implements Filter {
    @Override
    public void doFilter(ServletRequest request, ServletResponse response,
                         FilterChain chain) throws IOException, ServletException {
        HttpServletResponse httpServletResponse = (HttpServletResponse) response;
        httpServletResponse.setHeader("CustomHeaderName", "SomeValue");
        chain.doFilter(request, response);
    }
}

In case you are using webflux reactive component, then :

@Component
public class ResponseHeaderWebFilter implements WebFilter {
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, WebFilterChain chain) {
        exchange.getResponse()
          .getHeaders()
          .add("CustomHeaderName", "SomeValue");
        return chain.filter(exchange);
    }
}