diff --git a/gns3server/controller/controller_error.py b/gns3server/controller/controller_error.py
index eb38bc8e..c6f53149 100644
--- a/gns3server/controller/controller_error.py
+++ b/gns3server/controller/controller_error.py
@@ -72,3 +72,6 @@ class ComputeConflictError(ComputeError):
 
     def url(self):
         return self._url
+
+    def response(self):
+        return self._response