pwa

server.js

@@ -96,6 +96,7 @@ const MIME = {
   '.js': 'text/javascript; charset=utf-8',
   '.css': 'text/css; charset=utf-8',
   '.json': 'application/json',
+  '.webmanifest': 'application/manifest+json',
   '.svg': 'image/svg+xml',
   '.png': 'image/png',
   '.ico': 'image/x-icon',