solr/server/solr-webapp/webapp/js/lib/jquery.sammy.js
function(verb, path) {
      var ret = this.error(['404 Not Found', verb, path].join(' '));
      return (verb === 'get') ? ret : true;
    }
function(verb, path) {
      var ret = this.error(['404 Not Found', verb, path].join(' '));
      return (verb === 'get') ? ret : true;
    }
This thows a '404 Not Found' error by invoking `error()`. Override this method or `error()` to provide custom 404 behavior (i.e redirecting to / or showing a warning)