question: public void doFilter ( final ServletRequest request , final ServletResponse response , final FilterChain chain ) throws IOException , ServletException { UrlRewriter urlRewriter = getUrlRewriter ( request , response , chain ) ; final HttpServletRequest hsRequest = ( HttpServletRequest ) request ; final HttpServletResponse hsResponse = ( HttpServletResponse ) response ; UrlRewriteWrappedResponse urlRewriteWrappedResponse = new UrlRewriteWrappedResponse ( hsResponse , hsRequest , urlRewriter ) ; if ( statusEnabled && statusServerNameMatcher . isMatch ( request . getServerName ( ) ) ) { String uri = hsRequest . getRequestURI ( ) ; if ( log . isDebugEnabled ( ) ) { log . debug ( "checking for status path on " + uri ) ; } String contextPath = hsRequest . getContextPath ( ) ; if ( uri != null && uri . startsWith ( contextPath + statusPath ) ) { showStatus ( hsRequest , urlRewriteWrappedResponse ) ; return ; } } boolean requestRewritten = false ; if ( urlRewriter != null ) { requestRewritten = urlRewriter . processRequest ( hsRequest , urlRewriteWrappedResponse , chain ) ; } else { if ( log . isDebugEnabled ( ) ) { log . debug ( "urlRewriter engine not loaded ignoring request (could be a conf file problem)" ) ; } } if ( ! requestRewritten ) { chain . doFilter ( hsRequest , urlRewriteWrappedResponse ) ; } }
target:  The main method called for each request that this filter is mapped for.