anchor.diff:      }, onError: fileError);
     }
     
  +  /**
  +   * Start the HttpServer
  +   */
     void serve() {
       
       Path root = new Path(this._directory).canonicalize();
  
positive.code:             response.headers.set(HttpHeaders.CONTENT_LENGTH, end - start);
    
              // Set 'Partial Content' status code.
              response.statusCode = 206;
              response.headers.set(HttpHeaders.CONTENT_RANGE,
                                   "bytes $start-${end - 1}/$length");
    
  
negative.code:   
                    if (new Path(request.uri.path).segments().contains('..')) {
                      // Invalid path.
                      request.response.statusCode = HttpStatus.FORBIDDEN;
                      request.response.close();
                      return;
                    }
  