diff --git a/openerp/http.py b/openerp/http.py
index 1d35c989143..64023602d9d 100644
--- a/openerp/http.py
+++ b/openerp/http.py
@@ -396,14 +396,18 @@ def route(route=None, **kw):
             response = f(*args, **kw)
             if isinstance(response, Response) or f.routing_type == 'json':
                 return response
-            elif isinstance(response, werkzeug.wrappers.BaseResponse):
+
+            if isinstance(response, basestring):
+                return Response(response)
+
+            if isinstance(response, werkzeug.exceptions.HTTPException):
+                response = response.get_response()
+            if isinstance(response, werkzeug.wrappers.BaseResponse):
                 response = Response.force_type(response)
                 response.set_default()
                 return response
-            elif isinstance(response, basestring):
-                return Response(response)
-            else:
-                _logger.warn("<function %s.%s> returns an invalid response type for an http request" % (f.__module__, f.__name__))
+
+            _logger.warn("<function %s.%s> returns an invalid response type for an http request" % (f.__module__, f.__name__))
             return response
         response_wrap.routing = routing
         response_wrap.original_func = f