(core) updates from grist-core

app/server/lib/BootProbes.ts

@@ -118,7 +118,7 @@ const _webSocketsProbe: Probe = {
         url,
       };
       ws.on('open', () => {
-        ws.send('Just nod if you can hear me.');
+        ws.send('{"msg": "Just nod if you can hear me."}');
         resolve({
           status: 'success',
           details,

app/server/lib/FlexServer.ts

@@ -1123,6 +1123,7 @@ export class FlexServer implements GristServer {
         welcomeNewUser
       ],
       formMiddleware: [
+        this._userIdMiddleware,
         forcedLoginMiddleware,
       ],
       forceLogin: this._redirectToLoginUnconditionally,