anchor.diff:        // If If-Modified-Since is present and file haven't changed, return 304.
         if (request.headers.ifModifiedSince != null &&
             !lastModified.isAfter(request.headers.ifModifiedSince)) {
  -        response.statusCode = 304;
  +        response.statusCode = HttpStatus.NOT_MODIFIED;
           response.close();
           return;
         }
  
positive.code:   
                    if (new Path(request.uri.path).segments().contains('..')) {
                      // Invalid path.
                      request.response.statusCode = 403;
                      request.response.close();
                      return;
                    }
  
negative.code:             response.headers.set(HttpHeaders.CONTENT_LENGTH, end - start);
    
              // Set 'Partial Content' status code.
              response.statusCode = HttpStatus.PARTIAL_CONTENT;
              response.headers.set(HttpHeaders.CONTENT_RANGE,
                                   "bytes $start-${end - 1}/$length");
    
  