Application.java

        environment.servlets().addFilter("HttpErrorLoggerFilter", new HttpErrorLoggerFilter())
                .addMappingForUrlPatterns(EnumSet.allOf(DispatcherType.class), true, "/*");

HttpErrorLoggerFilter.java

package com.totango...;

import java.io.IOException;
import java.util.Enumeration;

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.HttpServletResponse;

import org.eclipse.jetty.server.Request;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * this filter logs HTTP errors.
 * @author ran
 */
public class HttpErrorLoggerFilter implements Filter {

    private static final Logger log = LoggerFactory.getLogger("HTTP.ERRORS");

    @Override
    public void init(final FilterConfig filterConfig) throws ServletException {
    }

    @Override
    public void doFilter(final ServletRequest request, final ServletResponse response, final FilterChain chain)
            throws IOException, ServletException {
        chain.doFilter(request, response);
        if (response instanceof HttpServletResponse) {
            final HttpServletResponse res = (HttpServletResponse) response;
            final int status = res.getStatus();
            if (status < 200 || status >= 400) {
                final StringBuilder sb = new StringBuilder("HTTP ERROR ");
                sb.append(status);
                if (request instanceof Request) {
                    // Using the class Request (from jetty) just to make things a little easier, such as getUri. 
                    // You could use a more generic HttpServletRequest class here and just extract the request
                    // data from it by yourself
                    final Request req = (Request) request;
                    sb.append("  ");
                    sb.append(req.getMethod());
                    sb.append(" ");
                    sb.append(req.getUri());
                    sb.append(" ");
                    sb.append("  HEADERS: {");
                    final Enumeration<String> headerNames = req.getHeaderNames();
                    while (headerNames.hasMoreElements()) {
                        final String name = headerNames.nextElement();
                        sb.append(name);
                        sb.append(": ");
                        sb.append(req.getHeader(name));
                        sb.append(", ");
                    }
                    sb.append("}");
                }
                log.info(sb.toString());
            }
        }

    }

    @Override
    public void destroy() {
    }

}