anchor.diff:  
     await for (var request in server) {
       print("[Worker ${worker.id}] ${request.method} ${request.uri.path} (${request.connectionInfo.remoteAddress.address})");
  -    
  +
       await serveFile(request, request.response);
     }
   }
  
positive.code:   var dir = new Directory(relative).absolute;
    var children = await dir.list().asyncMap((it) async {
      var stat = await it.stat();
      
      return {
        "name": it.path.replaceAll(dir.path, ""),
        "type": it is Directory ? "directory" : "file",
  
negative.code:     };
    }).toList();
    return jsonEncoder.convert(children);
  }
  