Hi;
When you make a query into Solr via Solr Admin Page and if an error occurs there writes "Loading.." and nothing happens. i.e. if you write an invalid Request Handler (something like /selectxxxx instead of /select) at Query page and even response is 404 Not Found you will see that "Loading..." is still there and you will not able to understand whether an error occurred or the response is so slow at first glance. I've resolved that issue with SOLR-5419 and you can check it. Thanks; Furkan KAMACI
