Cleanup VM service

runtime/bin/vmservice/service_request.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of vmservice;
 
 class ServiceRequest {
   final List<String> pathSegments = new List<String>();
   final Map<String, String> parameters = new Map<String, String>();
   String _response;
   String get response => _response;
 
   ServiceRequest();
 
   bool parse(Uri uri) {
     var path = uri.path;
     var split = path.split('/');
     if (split.length == 0) {
+      setErrorResponse('Invalid request uri: ${request.uri}');
       return false;
     }
     for (int i = 0; i < split.length; i++) {
       var pathSegment = split[i];
       if (pathSegment == '') {
         continue;
       }
       pathSegments.add(pathSegment);
     }
     uri.queryParameters.forEach((k, v) {
       parameters[k] = v;
     });
     return true;
   }
 
   List toServiceCallMessage() {
     return [pathSegments, parameters.keys.toList(), parameters.values.toList()];
   }
 
   void setErrorResponse(String error) {
     _response = JSON.encode({
-        'type': 'error',
+        'type': 'Error',
         'msg': error,
         'pathSegments': pathSegments,
         'parameters': parameters
     });
   }
 
   void setResponse(String response) {
     _response = response;
   }
 
 }