diff --git a/xos/api/service/vbng/debug.py b/xos/api/service/vbng/debug.py
index da22d96..8a7f69e 100644
--- a/xos/api/service/vbng/debug.py
+++ b/xos/api/service/vbng/debug.py
@@ -39,9 +39,9 @@
     serializer_class = CordDebugIdSerializer
 
     @classmethod
-    def get_urlpatterns(self, api_path=""):
+    def get_urlpatterns(self, api_path="^"):
         patterns = []
-        patterns.append( url("^" + api_path + "debug/vbng_dump/$", self.as_view({"get": "get_vbng_dump"}), name="vbng_dump"))
+        patterns.append( url(api_path + "debug/vbng_dump/$", self.as_view({"get": "get_vbng_dump"}), name="vbng_dump"))
         return patterns
 
     # contact vBNG service and dump current list of mappings
diff --git a/xos/api/tenant/cord/subscriber.py b/xos/api/tenant/cord/subscriber.py
index ac19420..12fc4e9 100644
--- a/xos/api/tenant/cord/subscriber.py
+++ b/xos/api/tenant/cord/subscriber.py
@@ -121,7 +121,7 @@
         return subscriber.vcpe
 
     @classmethod
-    def get_urlpatterns(self, api_path=""):
+    def get_urlpatterns(self, api_path="^"):
         patterns = super(CordSubscriberViewSet, self).get_urlpatterns(api_path=api_path)
         patterns.append( self.detail_url("vcpe_synced/$", {"get": "get_vcpe_synced"}, "vcpe_synced") )
         patterns.append( self.detail_url("url_filter/$", {"get": "get_url_filter"}, "url_filter") )
diff --git a/xos/api/xosapi_helpers.py b/xos/api/xosapi_helpers.py
index 69156af..98b5a5c 100644
--- a/xos/api/xosapi_helpers.py
+++ b/xos/api/xosapi_helpers.py
@@ -6,6 +6,13 @@
 from rest_framework import viewsets
 from django.conf.urls import patterns, url
 
+if hasattr(serializers, "ReadOnlyField"):
+    # rest_framework 3.x
+    ReadOnlyField = serializers.ReadOnlyField
+else:
+    # rest_framework 2.x
+    ReadOnlyField = serializers.Field
+
 """ PlusSerializerMixin
 
     Implements Serializer fields that are common to all OpenCloud objects. For
@@ -33,23 +40,23 @@
 
     @classmethod
     def detail_url(self, pattern, viewdict, name):
-        return url(r'^' + self.api_path + self.method_name + r'/(?P<pk>[a-zA-Z0-9\-]+)/' + pattern,
+        return url(self.api_path + self.method_name + r'/(?P<pk>[a-zA-Z0-9\-]+)/' + pattern,
                    self.as_view(viewdict),
                    name=self.base_name+"_"+name)
 
     @classmethod
     def list_url(self, pattern, viewdict, name):
-        return url(r'^' + self.api_path + self.method_name + r'/' + pattern,
+        return url(self.api_path + self.method_name + r'/' + pattern,
                    self.as_view(viewdict),
                    name=self.base_name+"_"+name)
 
     @classmethod
-    def get_urlpatterns(self, api_path=""):
+    def get_urlpatterns(self, api_path="^"):
         self.api_path = api_path
 
         patterns = []
 
-        patterns.append(url(r'^' + self.api_path + self.method_name + '/$', self.as_view({'get': 'list'}), name=self.base_name+'_list'))
-        patterns.append(url(r'^' + self.api_path + self.method_name + '/(?P<pk>[a-zA-Z0-9\-]+)/$', self.as_view({'get': 'retrieve', 'put': 'update', 'post': 'update', 'delete': 'destroy', 'patch': 'partial_update'}), name=self.base_name+'_detail'))
+        patterns.append(url(self.api_path + self.method_name + '/$', self.as_view({'get': 'list'}), name=self.base_name+'_list'))
+        patterns.append(url(self.api_path + self.method_name + '/(?P<pk>[a-zA-Z0-9\-]+)/$', self.as_view({'get': 'retrieve', 'put': 'update', 'post': 'update', 'delete': 'destroy', 'patch': 'partial_update'}), name=self.base_name+'_detail'))
 
         return patterns