anchor.diff:          ));
         }
         else{
  -        prepareRequestHandler(httpRequest, urlParams, handler);
  +        handler(request);
         }
       });
     }
  
positive.code:   final _httpBodyExtractor;
  
    /**
     * Constructor.
     */
    Backend.config(this._server, this.router, this._requestNavigator,
        this._hmacFactory, this._httpBodyExtractor);
  
    /**
     * Creates a new backend.
  
negative.code: 
    /**
     * If nothing is matched then try to add a slash on end and redirect. If still
     * nothing is matched then there is a default [_notFoundViewHandler], but it
     * can be overwritten by this method.
     */
    void addNotFoundView(RequestHandler handler) {
      _notFoundViewHandler = ((Request request) {
        var uri = request.httpRequest.uri;
        if (!uri.path.endsWith('/')) {
          //we set request.httpRequest.response because of consistency
          //  as (request.response := request.httpRequest.response)
          request.httpRequest.response.redirect(new Uri(
            scheme: uri.scheme,
            host: uri.host,
            port: uri.port,
  