anchor.diff:    await for (HttpRequest request in requestServer) {
       print(request.method + " " + request.uri.toString());
   
  +    var parameters = request.uri.queryParameters;
  +
       String key = request.uri.path;
       key = key.replaceAll(new RegExp('//+'), "/");
       String value = await UTF8.decodeStream(request);
   
       String finalMethod = request.method;
  -    if (null != request.uri.queryParameters["method"]) {
  -      finalMethod = request.uri.queryParameters["method"];
  +    if (null != parameters["method"]) {
  +      finalMethod = parameters["method"];
       }
   
       String finalValue = value;
  -    if (null != request.uri.queryParameters["value"]) {
  -      finalValue = request.uri.queryParameters["value"];
  +    if (null != parameters["value"]) {
  +      finalValue = parameters["value"];
       }
   
       switch (finalMethod) {
         case "GET":
  -        String result;
  -        if (key.endsWith("/")) {
  -          result = getChildrenAtKey(key).join("\n");
  +        if (parameters.containsKey("wait")) {
  +          changeFutures[key] = new Completer();
  +          changeFutures[key].future.then((value) {
  +            request.response.write(value);
  +            request.response.close();
  +          }).catchError((e) {
  +            request.response.statusCode = 500;
  +            request.response.write(e.toString());
  +            request.response.close();
  +          });
           } else {
  +          String result;
  +          if (key.endsWith("/")) {
  +            result = getChildrenAtKey(key).join("\n");
  +          } else {}
             result = getData(key);
  +          request.response.write(result);
  +          request.response.close();
           }
  -        request.response.write(result);
  -        request.response.close();
           break;
         case "PUT":
           setData(key, finalValue);
  
positive.code: import "dart:convert";
  import 'dart:io';
  
  
negative.code: \tport\tdefault: $port""";
  
  Map<String, String> data = new Map<String, String>();
  Map<String, Completer> changeFutures = new Map<String, Completer>();
  
  main(List<String> args) async {
    try {
  