diff --git a/cinder/api/middleware/auth.py b/cinder/api/middleware/auth.py
index d95e481b83d..8d145701d89 100644
--- a/cinder/api/middleware/auth.py
+++ b/cinder/api/middleware/auth.py
@@ -24,6 +24,7 @@ from oslo_config import cfg
 from oslo_log import log as logging
 from oslo_middleware import request_id
 from oslo_serialization import jsonutils
+from six.moves import http_client
 import webob.dec
 import webob.exc
 
@@ -129,7 +130,7 @@ class NoAuthMiddleware(base_wsgi.Middleware):
             res.headers['X-Auth-Token'] = '%s:%s' % (user_id, project_id)
             res.headers['X-Server-Management-Url'] = os_url
             res.content_type = 'text/plain'
-            res.status = '204'
+            res.status_int = http_client.NO_CONTENT
             return res
 
         token = req.headers['X-Auth-Token']
diff --git a/cinder/api/middleware/fault.py b/cinder/api/middleware/fault.py
index d2158b47b34..e25de79569b 100644
--- a/cinder/api/middleware/fault.py
+++ b/cinder/api/middleware/fault.py
@@ -16,6 +16,7 @@
 
 from oslo_log import log as logging
 import six
+from six.moves import http_client
 import webob.dec
 import webob.exc
 
@@ -49,9 +50,9 @@ class FaultWrapper(base_wsgi.Middleware):
                            'error': inner})
         safe = getattr(inner, 'safe', False)
         headers = getattr(inner, 'headers', None)
-        status = getattr(inner, 'code', 500)
+        status = getattr(inner, 'code', http_client.INTERNAL_SERVER_ERROR)
         if status is None:
-            status = 500
+            status = http_client.INTERNAL_SERVER_ERROR
 
         msg_dict = dict(url=req.url, status=status)
         LOG.info("%(url)s returned with HTTP %(status)d", msg_dict)
diff --git a/cinder/api/openstack/wsgi.py b/cinder/api/openstack/wsgi.py
index 2a0040a068d..f0a5f78017c 100644
--- a/cinder/api/openstack/wsgi.py
+++ b/cinder/api/openstack/wsgi.py
@@ -25,6 +25,7 @@ from oslo_utils import encodeutils
 from oslo_utils import excutils
 from oslo_utils import strutils
 import six
+from six.moves import http_client
 import webob
 import webob.exc
 
@@ -441,7 +442,7 @@ class ResponseObject(object):
 
         self.obj = obj
         self.serializers = serializers
-        self._default_code = 200
+        self._default_code = http_client.OK
         self._code = code
         self._headers = headers or {}
         self.serializer = None
@@ -1316,16 +1317,16 @@ class Controller(object):
 class Fault(webob.exc.HTTPException):
     """Wrap webob.exc.HTTPException to provide API friendly response."""
 
-    _fault_names = {400: "badRequest",
-                    401: "unauthorized",
-                    403: "forbidden",
-                    404: "itemNotFound",
-                    405: "badMethod",
-                    409: "conflictingRequest",
-                    413: "overLimit",
-                    415: "badMediaType",
-                    501: "notImplemented",
-                    503: "serviceUnavailable"}
+    _fault_names = {http_client.BAD_REQUEST: "badRequest",
+                    http_client.UNAUTHORIZED: "unauthorized",
+                    http_client.FORBIDDEN: "forbidden",
+                    http_client.NOT_FOUND: "itemNotFound",
+                    http_client.METHOD_NOT_ALLOWED: "badMethod",
+                    http_client.CONFLICT: "conflictingRequest",
+                    http_client.REQUEST_ENTITY_TOO_LARGE: "overLimit",
+                    http_client.UNSUPPORTED_MEDIA_TYPE: "badMediaType",
+                    http_client.NOT_IMPLEMENTED: "notImplemented",
+                    http_client.SERVICE_UNAVAILABLE: "serviceUnavailable"}
 
     def __init__(self, exception):
         """Create a Fault for the given webob.exc.exception."""
@@ -1344,7 +1345,7 @@ class Fault(webob.exc.HTTPException):
             fault_name: {
                 'code': code,
                 'message': i18n.translate(explanation, locale)}}
-        if code == 413:
+        if code == http_client.REQUEST_ENTITY_TOO_LARGE:
             retry = self.wrapped_exc.headers.get('Retry-After', None)
             if retry:
                 fault_data[fault_name]['retryAfter'] = retry
diff --git a/cinder/api/v1/snapshots.py b/cinder/api/v1/snapshots.py
index 4fb9358729c..76c44165f8b 100644
--- a/cinder/api/v1/snapshots.py
+++ b/cinder/api/v1/snapshots.py
@@ -15,6 +15,8 @@
 
 """The volumes snapshots api."""
 
+
+from six.moves import http_client
 from webob import exc
 
 from cinder.api.openstack import wsgi
@@ -70,7 +72,7 @@ class SnapshotsController(snapshots_v2.SnapshotsController):
             super(SnapshotsController, self).detail(
                 _update_search_opts(req)))
 
-    @wsgi.response(200)
+    @wsgi.response(http_client.OK)
     def create(self, req, body):
         """Creates a new snapshot."""
         if (body is None or not body.get('snapshot') or
diff --git a/cinder/api/v1/volumes.py b/cinder/api/v1/volumes.py
index c94ad689b2c..61dea6698ef 100644
--- a/cinder/api/v1/volumes.py
+++ b/cinder/api/v1/volumes.py
@@ -16,6 +16,7 @@
 """The volumes api."""
 
 from oslo_log import log as logging
+from six.moves import http_client
 from webob import exc
 
 from cinder.api.openstack import wsgi
@@ -102,7 +103,7 @@ class VolumeController(volumes_v2.VolumeController):
         return _volume_v2_to_v1(
             super(VolumeController, self).detail(req))
 
-    @wsgi.response(200)
+    @wsgi.response(http_client.OK)
     def create(self, req, body):
         """Creates a new volume."""
         if (body is None or not body.get('volume') or
diff --git a/cinder/api/v2/limits.py b/cinder/api/v2/limits.py
index 2578acb55cc..e306fd5dd2a 100644
--- a/cinder/api/v2/limits.py
+++ b/cinder/api/v2/limits.py
@@ -415,7 +415,7 @@ class WsgiLimiterProxy(object):
 
         resp = conn.getresponse()
 
-        if 200 >= resp.status < 300:
+        if http_client.OK >= resp.status < http_client.MULTIPLE_CHOICES:
             return None, None
 
         return resp.getheader("X-Wait-Seconds"), resp.read() or None
diff --git a/cinder/api/v2/snapshot_metadata.py b/cinder/api/v2/snapshot_metadata.py
index 6e94c3f309d..84c61be3a70 100644
--- a/cinder/api/v2/snapshot_metadata.py
+++ b/cinder/api/v2/snapshot_metadata.py
@@ -13,6 +13,7 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
+from six.moves import http_client
 import webob
 from webob import exc
 
@@ -128,7 +129,7 @@ class Controller(wsgi.Controller):
         # Not found exception will be handled at the wsgi level
         snapshot = self.volume_api.get_snapshot(context, snapshot_id)
         self.volume_api.delete_snapshot_metadata(context, snapshot, id)
-        return webob.Response(status_int=200)
+        return webob.Response(status_int=http_client.OK)
 
 
 def create_resource():
diff --git a/cinder/api/v2/snapshots.py b/cinder/api/v2/snapshots.py
index 467c911a408..903096a8478 100644
--- a/cinder/api/v2/snapshots.py
+++ b/cinder/api/v2/snapshots.py
@@ -18,6 +18,7 @@
 from oslo_log import log as logging
 from oslo_utils import encodeutils
 from oslo_utils import strutils
+from six.moves import http_client
 import webob
 from webob import exc
 
@@ -64,7 +65,7 @@ class SnapshotsController(wsgi.Controller):
         snapshot = self.volume_api.get_snapshot(context, id)
         self.volume_api.delete_snapshot(context, snapshot)
 
-        return webob.Response(status_int=202)
+        return webob.Response(status_int=http_client.ACCEPTED)
 
     def index(self, req):
         """Returns a summary list of snapshots."""
@@ -108,7 +109,7 @@ class SnapshotsController(wsgi.Controller):
             snapshots = self._view_builder.summary_list(req, snapshots.objects)
         return snapshots
 
-    @wsgi.response(202)
+    @wsgi.response(http_client.ACCEPTED)
     def create(self, req, body):
         """Creates a new snapshot."""
         kwargs = {}
diff --git a/cinder/api/v2/volume_metadata.py b/cinder/api/v2/volume_metadata.py
index 37c3e52d5c1..5799494f65b 100644
--- a/cinder/api/v2/volume_metadata.py
+++ b/cinder/api/v2/volume_metadata.py
@@ -13,6 +13,7 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
+from six.moves import http_client
 import webob
 
 from cinder.api import common
@@ -136,7 +137,7 @@ class Controller(wsgi.Controller):
             volume,
             id,
             meta_type=common.METADATA_TYPES.user)
-        return webob.Response(status_int=200)
+        return webob.Response(status_int=http_client.OK)
 
 
 def create_resource():
diff --git a/cinder/api/v2/volumes.py b/cinder/api/v2/volumes.py
index c09ad0c1966..0b6d4ff5f48 100644
--- a/cinder/api/v2/volumes.py
+++ b/cinder/api/v2/volumes.py
@@ -19,6 +19,7 @@
 from oslo_config import cfg
 from oslo_log import log as logging
 from oslo_utils import uuidutils
+from six.moves import http_client
 import webob
 from webob import exc
 
@@ -75,7 +76,7 @@ class VolumeController(wsgi.Controller):
         # Not found exception will be handled at the wsgi level
         volume = self.volume_api.get(context, id)
         self.volume_api.delete(context, volume, cascade=cascade)
-        return webob.Response(status_int=202)
+        return webob.Response(status_int=http_client.ACCEPTED)
 
     def index(self, req):
         """Returns a summary list of volumes."""
@@ -171,7 +172,7 @@ class VolumeController(wsgi.Controller):
                 "access requested image.")
         raise exc.HTTPBadRequest(explanation=msg)
 
-    @wsgi.response(202)
+    @wsgi.response(http_client.ACCEPTED)
     def create(self, req, body):
         """Creates a new volume."""
         self.assert_valid_body(body, 'volume')