anchor.diff:  
     String _pathPrefix;
   
  -  /// Value for the "Via" header.
  -
  -  final String _via;
  +  /// Identifies this proxy in "Via" headers this proxy will add.
  +
  +  final String _receivedBy;
   
     /// Indicates if a Via header is added to the response.
  +  ///
  +  /// Adding a Via header into the HTTP response is optional. This member
  +  /// controls whether it is added or not.
   
     final bool includeViaHeaderInResponse;
   
  
positive.code:     // Again, since _http.get_ does not support multiple headers, if there are
      // any existing Via header(s), their values are concatenated together
      // with the new value and separated by a comma.
  
      final _newVia = req.headers['via'] != null
          ? '${req.headers['via'].where((s) => s.isNotEmpty).join(', ')}, $_via'
  
negative.code:     'proxy-authenticate',
    ];
  
    // Default value to use for received-by in the "Via" header.
    //
    // This is used to identify the proxy when no value for received-by was
    // provided to the constructor.
  
    static const String _receivedByDefault = 'woomera_proxy';
  
    //================================================================
    // Members
  