diff --git a/src/googleapiclient/__init__.py b/src/googleapiclient/__init__.py
index 26442ace..b911ff05 100644
--- a/src/googleapiclient/__init__.py
+++ b/src/googleapiclient/__init__.py
@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-__version__ = "1.5.1"
+__version__ = "1.5.2"
 
 # Set default logging handler to avoid "No handler found" warnings.
 import logging
diff --git a/src/googleapiclient/channel.py b/src/googleapiclient/channel.py
index 702186b6..7d0feb94 100644
--- a/src/googleapiclient/channel.py
+++ b/src/googleapiclient/channel.py
@@ -64,6 +64,13 @@ from googleapiclient import errors
 from oauth2client import util
 import six
 
+# Oauth2client < 3 has the positional helper in 'util', >= 3 has it
+# in '_helpers'.
+try:
+  from oauth2client import util
+except ImportError:
+  from oauth2client import _helpers as util
+
 
 # The unix time epoch starts at midnight 1970.
 EPOCH = datetime.datetime.utcfromtimestamp(0)
diff --git a/src/googleapiclient/discovery.py b/src/googleapiclient/discovery.py
index ecb75fa4..598b222c 100644
--- a/src/googleapiclient/discovery.py
+++ b/src/googleapiclient/discovery.py
@@ -69,8 +69,15 @@ from googleapiclient.model import MediaModel
 from googleapiclient.model import RawModel
 from googleapiclient.schema import Schemas
 from oauth2client.client import GoogleCredentials
-from oauth2client.util import _add_query_parameter
-from oauth2client.util import positional
+
+# Oauth2client < 3 has the positional helper in 'util', >= 3 has it
+# in '_helpers'.
+try:
+  from oauth2client.util import _add_query_parameter
+  from oauth2client.util import positional
+except ImportError:
+  from oauth2client._helpers import _add_query_parameter
+  from oauth2client._helpers import positional
 
 
 # The client library requires a version of httplib2 that supports RETRIES.
@@ -315,6 +322,15 @@ def build_from_document(
 
   if isinstance(service, six.string_types):
     service = json.loads(service)
+
+  if  'rootUrl' not in service and (isinstance(http, (HttpMock,
+                                                      HttpMockSequence))):
+      logger.error("You are using HttpMock or HttpMockSequence without" +
+                   "having the service discovery doc in cache. Try calling " +
+                   "build() without mocking once first to populate the " +
+                   "cache.")
+      raise InvalidJsonError()
+
   base = urljoin(service['rootUrl'], service['servicePath'])
   schema = Schemas(service)
 
diff --git a/src/googleapiclient/errors.py b/src/googleapiclient/errors.py
index 3d44de70..1b79d2fe 100644
--- a/src/googleapiclient/errors.py
+++ b/src/googleapiclient/errors.py
@@ -23,7 +23,12 @@ __author__ = 'jcgregorio@google.com (Joe Gregorio)'
 
 import json
 
-from oauth2client import util
+# Oauth2client < 3 has the positional helper in 'util', >= 3 has it
+# in '_helpers'.
+try:
+  from oauth2client import util
+except ImportError:
+  from oauth2client import _helpers as util
 
 
 class Error(Exception):
diff --git a/src/googleapiclient/http.py b/src/googleapiclient/http.py
index 5181badb..14580f0c 100644
--- a/src/googleapiclient/http.py
+++ b/src/googleapiclient/http.py
@@ -55,6 +55,13 @@ from email.mime.multipart import MIMEMultipart
 from email.mime.nonmultipart import MIMENonMultipart
 from email.parser import FeedParser
 
+# Oauth2client < 3 has the positional helper in 'util', >= 3 has it
+# in '_helpers'.
+try:
+  from oauth2client import util
+except ImportError:
+  from oauth2client import _helpers as util
+
 from googleapiclient import mimeparse
 from googleapiclient.errors import BatchError
 from googleapiclient.errors import HttpError
@@ -63,7 +70,6 @@ from googleapiclient.errors import ResumableUploadError
 from googleapiclient.errors import UnexpectedBodyError
 from googleapiclient.errors import UnexpectedMethodError
 from googleapiclient.model import JsonModel
-from oauth2client import util
 
 
 LOGGER = logging.getLogger(__name__)
@@ -639,7 +645,7 @@ class MediaIoBaseDownload(object):
     """Get the next chunk of the download.
 
     Args:
-      num_retries: Integer, number of times to retry 500's with randomized
+      num_retries: Integer, number of times to retry with randomized
             exponential backoff. If all retries fail, the raised HttpError
             represents the last request. If zero (default), we attempt the
             request only once.
@@ -782,7 +788,7 @@ class HttpRequest(object):
     Args:
       http: httplib2.Http, an http object to be used in place of the
             one the HttpRequest request object was constructed with.
-      num_retries: Integer, number of times to retry 500's with randomized
+      num_retries: Integer, number of times to retry with randomized
             exponential backoff. If all retries fail, the raised HttpError
             represents the last request. If zero (default), we attempt the
             request only once.
@@ -870,7 +876,7 @@ class HttpRequest(object):
     Args:
       http: httplib2.Http, an http object to be used in place of the
             one the HttpRequest request object was constructed with.
-      num_retries: Integer, number of times to retry 500's with randomized
+      num_retries: Integer, number of times to retry with randomized
             exponential backoff. If all retries fail, the raised HttpError
             represents the last request. If zero (default), we attempt the
             request only once.
@@ -965,7 +971,7 @@ class HttpRequest(object):
       except:
         self._in_error_state = True
         raise
-      if resp.status < 500:
+      if not _should_retry_response(resp.status, content):
         break
 
     return self._process_response(resp, content)
@@ -1394,6 +1400,14 @@ class BatchHttpRequest(object):
     if http is None:
       raise ValueError("Missing a valid http object.")
 
+    # Special case for OAuth2Credentials-style objects which have not yet been
+    # refreshed with an initial access_token.
+    if getattr(http.request, 'credentials', None) is not None:
+      creds = http.request.credentials
+      if not getattr(creds, 'access_token', None):
+        LOGGER.info('Attempting refresh to obtain initial access_token')
+        creds.refresh(http)
+
     self._execute(http, self._order, self._requests)
 
     # Loop over all the requests and check for 401s. For each 401 request the
diff --git a/src/googleapiclient/schema.py b/src/googleapiclient/schema.py
index ecb3f8bf..9feaf28a 100644
--- a/src/googleapiclient/schema.py
+++ b/src/googleapiclient/schema.py
@@ -65,7 +65,12 @@ __author__ = 'jcgregorio@google.com (Joe Gregorio)'
 
 import copy
 
-from oauth2client import util
+# Oauth2client < 3 has the positional helper in 'util', >= 3 has it
+# in '_helpers'.
+try:
+  from oauth2client import util
+except ImportError:
+  from oauth2client import _helpers as util
 
 
 class Schemas(object):