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package com.koor.hello;

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.annotation.WebFilter;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpServletResponseWrapper;

@WebFilter( urlPatterns="/lifecycle" )
public class MyFilter implements Filter {
    
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
    }
    
    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain ) 
            throws IOException, ServletException {
        
        chain.doFilter( request, new HttpServletResponseWrapper( (HttpServletResponse) response ) {
            @Override
            public void setHeader(String name, String value) {
                if( ! name.equalsIgnoreCase( "Demo" ) ) {
                    super.setHeader(name, value);
                }
            }
        });
        
    }
    
    @Override
    public void destroy() {
    }

}