ProxyPreFilter.java

package io.cattle.platform.iaas.api.servlet.filter;

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.HttpServletRequestWrapper;

public class ProxyPreFilter 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(new Request((HttpServletRequest)request), response);
    }

    @Override
    public void destroy() {
    }

    public class Request extends HttpServletRequestWrapper {
        public Request(HttpServletRequest request) {
            super(request);
        }

        @Override
        public String getMethod() {
            return "GET";
        }

        public String getRealMethod() {
            return ((HttpServletRequest) super.getRequest()).getMethod();
        }
    }
}