Statics with helmet

chapter04/src/serve_helmet.js

@@ -0,0 +1,31 @@
+/* @flow */
+"use strict";
+
+const express = require("express");
+const path = require("path");
+const app = express();
+
+const helmet = require("helmet");
+app.use(helmet());
+
+app.get("/", (req, res) => res.send("Server alive, with Express!"));
+
+app.get(
+    "/static",
+    express.static(path.join(__dirname, "../flags"), {
+        immutable: true,
+        maxAge: "30 days"
+    })
+);
+
+// eslint-disable-next-line no-unused-vars
+app.use((err, req, res, next) => {
+    console.error("Error....", err.message);
+    res.status(500).send("INTERNAL SERVER ERROR");
+});
+
+app.listen(8080, () =>
+    console.log(
+        "Mini Express static server ready at http://localhost:8080/!"
+    )
+);