Now using the dataWrapper features flag to control serialization of JSON requests.
diff --git a/apiclient/discovery.py b/apiclient/discovery.py
index b7bc823..7ae6a8a 100644
--- a/apiclient/discovery.py
+++ b/apiclient/discovery.py
@@ -68,7 +68,7 @@
           http=None,
           discoveryServiceUrl=DISCOVERY_URI,
           developerKey=None,
-          model=JsonModel(),
+          model=None,
           requestBuilder=HttpRequest):
   """Construct a Resource for interacting with an API.
 
@@ -125,7 +125,7 @@
     future=None,
     http=None,
     developerKey=None,
-    model=JsonModel(),
+    model=None,
     requestBuilder=HttpRequest):
   """Create a Resource for interacting with an API.
 
@@ -160,6 +160,8 @@
     future = {}
     auth_discovery = {}
 
+  if model is None:
+    model = JsonModel('dataWrapper' in service.get('features', []))
   resource = createResource(http, base, model, requestBuilder, developerKey,
                        service, future)
 
diff --git a/apiclient/http.py b/apiclient/http.py
index f713ec8..094271f 100644
--- a/apiclient/http.py
+++ b/apiclient/http.py
@@ -150,7 +150,7 @@
       resp, content = self.responses[methodId]
       return HttpRequestMock(resp, content, postproc)
     else:
-      model = JsonModel()
+      model = JsonModel(False)
       return HttpRequestMock(None, '{}', model.response)
 
 
diff --git a/apiclient/model.py b/apiclient/model.py
index 58cd624..55bcc94 100644
--- a/apiclient/model.py
+++ b/apiclient/model.py
@@ -73,6 +73,14 @@
   object representation of HTTP request and response bodies.
   """
 
+  def __init__(self, data_wrapper):
+    """Construct a JsonModel
+
+    Args:
+      data_wrapper: boolean, wrap requests and responses in a data wrapper
+    """
+    self._data_wrapper = data_wrapper
+
   def request(self, headers, path_params, query_params, body_value):
     """Updates outgoing requests with JSON bodies.
 
@@ -97,6 +105,10 @@
     else:
       headers['user-agent'] = ''
     headers['user-agent'] += 'google-api-python-client/1.0'
+
+    if (isinstance(body_value, dict) and 'data' not in body_value and
+        self._data_wrapper):
+      body_value = {'data': body_value}
     if body_value is None:
       return (headers, path_params, query, None)
     else: