Adding custom header to response in spring rest / spring boot - spring-boot

Question

i am trying to send session id in response header in rest controller but excludepathpattern() seems not working
** the configuration class is not triggering **
i have tried changing the sevlet version but it didnt work
ContextListener
#Override
public void contextInitialized(ServletContextEvent sce) {
ServletContext context = sce.getServletContext();
Map<String, HttpSession> map = new HashMap<>();
context.setAttribute("activeUsers", map);
HttpSessionListener
ServletContext context = session.getServletContext();
Map<String, HttpSession> activeUsers = (Map<String, HttpSession>) context.getAttribute("activeUsers");
activeUsers.put(session.getId(), session);
HandlerInterceptor
ServletContext context = request.getServletContext();
Map<String, HttpSession> activeUsers = (Map<String, HttpSession>) context.getAttribute("activeUsers");
String sessionId = request.getHeader("sessionId");
String requestUrl = request.getRequestURL().toString();
if (requestUrl.contains("/getOtp") || requestUrl.contains("/validateOtp")) {
return true;
} else {
if (activeUsers.containsKey(sessionId)) {
return true;
} else {
response.setStatus(401);
return false;
}
}
interceptorconfigurartion by extendig websecurityconfigure
#Configuration
#EnableAutoConfiguration
public class SessionInterceptorConfig implements WebMvcConfigurer {
#Autowired
private SessionHanlderInterceptor sessionHandlerIntercepto;
#Override
public void addInterceptors(InterceptorRegistry registry) {
// List<String> paths = new ArrayList<String>();
// paths.add("/auth/*");
registry.addInterceptor(sessionHandlerIntercepto).excludePathPatterns("/auth/**");
}
#Bean
public ServletListenerRegistrationBean<CustomSessionListener> filterRegistrationBean() {
ServletListenerRegistrationBean<CustomSessionListener> registrationBean = new ServletListenerRegistrationBean<CustomSessionListener>();
CustomSessionListener customURLFilter = new CustomSessionListener();
registrationBean.setListener(customURLFilter);
registrationBean.setOrder(1); // set precedence
return registrationBean;
}
#Bean
public ServletListenerRegistrationBean<CustomServletContextListener> filterContextRregistration() {
ServletListenerRegistrationBean<CustomServletContextListener> registrationBean = new ServletListenerRegistrationBean<CustomServletContextListener>();
CustomServletContextListener customURLFilter = new CustomServletContextListener();
registrationBean.setListener(customURLFilter);
registrationBean.setOrder(1); // set precedence
return registrationBean;
}
Sprinboot main class
#SpringBootApplication
public class CustomerApplication extends SpringBootServletInitializer {
i expect to add the session id to header in response and to check for the sessionid in request

Answer 1

You can use spring web component "OncePerRequestFilter". You need to inject a bean which extends OncePerRequestFilter. Example:
public class CustomHeaderFilter extends OncePerRequestFilter {
#Override
public void doFilterInternal(final HttpServletRequest request, final HttpServletResponse response,
final FilterChain chain) throws IOException, ServletException {
response.setHeader(customHeaderName, customHeaderValue);
chain.doFilter(request, response);
}
}