TBR http://codereview.appspot.com/5712052/. Fixes issue #111.

oauth2client/appengine.py

@@ -409,7 +409,7 @@ class OAuth2Decorator(object):
     user = users.get_current_user()
     memcache.set(user.user_id(), pickle.dumps(self.flow),
                  namespace=OAUTH2CLIENT_NAMESPACE)
-    return url
+    return str(url)
 
   def http(self):
     """Returns an authorized http instance.

setup.py

@@ -30,7 +30,7 @@ packages = [
   ]
 
 install_requires = [
-    'httplib2>=0.7.2',
+    'httplib2>=0.7.4',
     'oauth2',
     'python-gflags',
     ]