Merge pull request #2500 from nekrondev/master

fix(webapp): downstream keep-alive events to backend preventing timeout

modules/webapp/src/main/webjar/docspell.js

@@ -152,6 +152,8 @@ function initWS() {
             var dataJSON = JSON.parse(event.data);
             if (dataJSON.tag !== "keep-alive") {
                 elmApp.ports.receiveWsMessage.send(dataJSON);
+            } else {
+                dsWebSocket.send(event.data);
             }
         }
     });