404

src/index.ts

@@ -63,4 +63,9 @@ webServer.use(express.static('public'))
 
 webServer.listen(process.env.PORT, () => {
   console.log('Example app listening on port '+process.env.PORT+'!')
+})
+
+// when client try to access 404 file
+webServer.use(function (req, res, next) {
+  res.status(404).send("Sorry can't find that!")
 })