Server-side printing, roll type setting, cache headers

src/server.js

@@ -72,7 +72,19 @@ app.get('/admin/login', (req, res) => {
 // Nobody should land on the raw filenames; keep one address per page.
 app.get(['/admin.html', '/login.html'], (req, res) => res.redirect('/admin'));
 
-app.use(express.static(publicDir, { extensions: ['html'], index: false }));
+// no-cache still allows a 304 on an unchanged file, but forces the browser to ask
+// first. Without it a cached admin.js survives an upgrade and the console keeps
+// running yesterday's code against today's server, which is impossible to diagnose
+// from the outside.
+app.use(
+  express.static(publicDir, {
+    extensions: ['html'],
+    index: false,
+    setHeaders: (res, filePath) => {
+      if (/\.(html|js|css)$/.test(filePath)) res.setHeader('Cache-Control', 'no-cache');
+    },
+  })
+);
 app.get('/favicon.ico', (req, res) => res.redirect(301, '/favicon.svg'));
 app.use((req, res) => res.status(404).sendFile(path.join(publicDir, 'index.html')));