diff --git a/etc/reddwarf/reddwarf.conf.sample b/etc/reddwarf/reddwarf.conf.sample
index 264956d03c..f2412dd87a 100644
--- a/etc/reddwarf/reddwarf.conf.sample
+++ b/etc/reddwarf/reddwarf.conf.sample
@@ -86,7 +86,7 @@ use = call:reddwarf.common.wsgi:versioned_urlmap
 paste.app_factory = reddwarf.versions:app_factory
 
 [pipeline:reddwarfapi]
-pipeline = tokenauth authorization contextwrapper extensions reddwarfapp
+pipeline = faultwrapper tokenauth authorization contextwrapper extensions reddwarfapp
 #pipeline = debug extensions reddwarfapp
 
 [filter:extensions]
@@ -109,6 +109,9 @@ paste.filter_factory = reddwarf.common.auth:AuthorizationMiddleware.factory
 [filter:contextwrapper]
 paste.filter_factory = reddwarf.common.wsgi:ContextMiddleware.factory
 
+[filter:faultwrapper]
+paste.filter_factory = reddwarf.common.wsgi:FaultWrapper.factory
+
 [app:reddwarfapp]
 paste.app_factory = reddwarf.common.api:app_factory
 
diff --git a/etc/reddwarf/reddwarf.conf.test b/etc/reddwarf/reddwarf.conf.test
index 8b7622ddbf..ee93deac5d 100644
--- a/etc/reddwarf/reddwarf.conf.test
+++ b/etc/reddwarf/reddwarf.conf.test
@@ -94,7 +94,7 @@ use = call:reddwarf.common.wsgi:versioned_urlmap
 paste.app_factory = reddwarf.versions:app_factory
 
 [pipeline:reddwarfapi]
-pipeline = tokenauth authorization contextwrapper extensions reddwarfapp
+pipeline = faultwrapper tokenauth authorization contextwrapper extensions reddwarfapp
 #pipeline = debug extensions reddwarfapp
 
 [filter:extensions]
@@ -117,6 +117,9 @@ paste.filter_factory = reddwarf.common.auth:AuthorizationMiddleware.factory
 [filter:contextwrapper]
 paste.filter_factory = reddwarf.common.wsgi:ContextMiddleware.factory
 
+[filter:faultwrapper]
+paste.filter_factory = reddwarf.common.wsgi:FaultWrapper.factory
+
 [app:reddwarfapp]
 paste.app_factory = reddwarf.common.api:app_factory
 
diff --git a/reddwarf/common/wsgi.py b/reddwarf/common/wsgi.py
index 5392095c96..3f856a770f 100644
--- a/reddwarf/common/wsgi.py
+++ b/reddwarf/common/wsgi.py
@@ -313,6 +313,15 @@ class ReddwarfResponseSerializer(openstack_wsgi.ResponseSerializer):
 class Fault(webob.exc.HTTPException):
     """Error codes for API faults."""
 
+    code_wrapper = {
+        400: webob.exc.HTTPBadRequest,
+        401: webob.exc.HTTPUnauthorized,
+        403: webob.exc.HTTPUnauthorized,
+        404: webob.exc.HTTPNotFound,
+    }
+
+    resp_codes = [int(code) for code in code_wrapper.keys()]
+
     def __init__(self, exception):
         """Create a Fault for the given webob.exc.exception."""
 
@@ -407,3 +416,29 @@ class ContextMiddleware(openstack_wsgi.Middleware):
                        local_config)
             return cls(app)
         return _factory
+
+
+class FaultWrapper(openstack_wsgi.Middleware):
+    """Calls down the middleware stack, making exceptions into faults."""
+
+    @webob.dec.wsgify(RequestClass=openstack_wsgi.Request)
+    def __call__(self, req):
+        try:
+            resp = req.get_response(self.application)
+            if resp.status_int in Fault.resp_codes:
+                for (header, value) in resp._headerlist:
+                    if header == "Content-Type" and \
+                            value == "text/plain; charset=UTF-8":
+                        return Fault(Fault.code_wrapper[resp.status_int]())
+                return resp
+            return resp
+        except Exception as ex:
+            LOG.exception(_("Caught error: %s"), unicode(ex))
+            exc = webob.exc.HTTPInternalServerError()
+            return Fault(exc)
+
+    @classmethod
+    def factory(cls, global_config, **local_config):
+        def _factory(app):
+            return cls(app)
+        return _factory
diff --git a/reddwarf/extensions/mysql/service.py b/reddwarf/extensions/mysql/service.py
index f921434f67..46fbee72e8 100644
--- a/reddwarf/extensions/mysql/service.py
+++ b/reddwarf/extensions/mysql/service.py
@@ -131,11 +131,17 @@ class UserController(BaseController):
         LOG.info(_("Deleting user for instance '%s'") % instance_id)
         LOG.info(_("req : '%s'\n\n") % req)
         context = req.environ[wsgi.CONTEXT_KEY]
-        user = guest_models.MySQLUser()
-        user.name = id
-        models.User.delete(context, instance_id, user.serialize())
+        try:
+            user = guest_models.MySQLUser()
+            user.name = id
+            models.User.delete(context, instance_id, user.serialize())
+        except ValueError as ve:
+            raise exception.BadRequest(ve.message)
         return wsgi.Result(None, 202)
 
+    def show(self, req, tenant_id, instance_id, id):
+        raise webob.exc.HTTPNotImplemented()
+
 
 class SchemaController(BaseController):
     """Controller for instance functionality"""
@@ -178,7 +184,13 @@ class SchemaController(BaseController):
         LOG.info(_("Deleting schema for instance '%s'") % instance_id)
         LOG.info(_("req : '%s'\n\n") % req)
         context = req.environ[wsgi.CONTEXT_KEY]
-        schema = guest_models.MySQLDatabase()
-        schema.name = id
-        models.Schema.delete(context, instance_id, schema.serialize())
+        try:
+            schema = guest_models.MySQLDatabase()
+            schema.name = id
+            models.Schema.delete(context, instance_id, schema.serialize())
+        except ValueError as ve:
+            raise exception.BadRequest(ve.message)
         return wsgi.Result(None, 202)
+
+    def show(self, req, tenant_id, instance_id, id):
+        raise webob.exc.HTTPNotImplemented()