IT Knowledge Sharing | Interview questions

Handle CORS problem using java (Servlet/Filter) 1. Make a Filter to handle all CORS request import java.io.IOException; import javax.servlet.Filter; import javax.servlet.FilterChain; import javax.servlet.FilterConfig; import javax.servlet.ServletException; import javax.servlet.ServletRequest; import javax.servlet.ServletResponse; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; /**  * Servlet Filter implementation class CORSFilter  */ public class CORSFilter implements Filter {         public CORSFilter() {         // TODO Auto-generated constructor stub     }         public void destroy() {         // TODO Auto-generated method stub     }             public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain chain) throws IOException, ServletException {         HttpServletRequest request = (HttpServletRequest) servletRequest;              HttpServletResponse resp = (HttpServletResponse) servletResp