anchor.diff:    void _httpRequestHandler(HttpRequest req) {
       print('${req.method} ${req.uri.path}');
   
  -    for (final String url in this.urls.keys) {
  -      RegExp exp = new RegExp('^${url}\$');
  +    for (final String urlRegex in this.urls.keys) {
  +      RegExp exp = new RegExp('^${urlRegex}\$');
         Iterable<Match> matches = exp.allMatches(req.uri.path);
   
         //for (Match m in matches) {
  
positive.code:       //  print('matched: ${match}');
        //}
        if (matches.length > 0) {
          req.response.write('Hello, world');
          req.response.close();
          return;
        }
      }
      // 404 not found
  
negative.code: class index {
    String name = 'index';
  
    void GET(HttpRequest req) {
      req.response.write('Hello, world');
      req.response.close();
    }
  }
  
  