anchor.diff:    int _state;
     int _httpVersionIndex;
     int _messageType;
  -  StringBuffer _method_or_status_code;
  -  StringBuffer _uri_or_reason_phrase;
  -  StringBuffer _headerField;
  -  StringBuffer _headerValue;
  +  List _method_or_status_code;
  +  List _uri_or_reason_phrase;
  +  List _headerField;
  +  List _headerValue;
   
     int _httpVersion;
     int _contentLength;
  
positive.code:                   statusCode <= 199 || statusCode == 204 || statusCode == 304;
              }
              responseStart(statusCode,
                            _uri_or_reason_phrase.toString(),
                            version);
              _method_or_status_code.clear();
              _uri_or_reason_phrase.clear();
  
negative.code:             if (byte == _CharCode.CR) {
                _state = _State.HEADER_VALUE_FOLDING_OR_ENDING;
              } else {
                _headerValue.add(byte);
              }
              break;
  
  