made status optional for redirection

lib/modules/http.js

@@ -165,7 +165,7 @@ module.exports.create = function (deps, conf, greenlockMiddleware) {
       match.slice(1).forEach(function (globMatch, index) {
         to = to.replace(':'+(index+1), globMatch);
       });
-      res.writeHead(mod.status, { 'Location': to });
+      res.writeHead(mod.status || 301, { 'Location': to });
       res.end();
     };
   }