.

src/server.ts

@@ -1,4 +1,5 @@
 import { install } from 'source-map-support'
+import * as throng from 'throng'
 
 import 'zone.js/dist/zone-node'
 import './ssr-polyfills'
@@ -9,31 +10,43 @@ import { ngExpressEngine } from '@nguniversal/express-engine'
 import * as express from 'express'
 import { join } from 'path'
 
+
 install()
 enableProdMode()
 
-const app = express()
-
-const PORT = process.env.PORT || 4000
-const DIST_FOLDER = join(process.cwd(), 'build')
-
 import { AppServerModule } from './app.server.module'
 
-app.engine('html', ngExpressEngine({
+const engine = ngExpressEngine({
     bootstrap: AppServerModule,
-}))
-
-app.set('view engine', 'html')
-app.set('views', DIST_FOLDER)
-
-app.get('*.*', express.static(DIST_FOLDER, {
-    maxAge: '1y',
-}))
-
-app.get('*', (req, res) => {
-    res.render('index', { req })
 })
 
-app.listen(PORT, () => {
-    console.log(`Node Express server listening on http://localhost:${PORT}`)
+function start () {
+    const app = express()
+
+    const PORT = process.env.PORT || 4000
+    const DIST_FOLDER = join(process.cwd(), 'build')
+
+    app.engine('html', engine)
+
+    app.set('view engine', 'html')
+    app.set('views', DIST_FOLDER)
+
+    app.get('*.*', express.static(DIST_FOLDER, {
+        maxAge: '1y',
+    }))
+
+    app.get('*', (req, res) => {
+        res.render('index', { req })
+    })
+
+    app.listen(PORT, () => {
+        console.log(`Node Express server listening on http://localhost:${PORT}`)
+    })
+}
+
+const WORKERS = process.env.WEB_CONCURRENCY || 4
+throng({
+    workers: WORKERS,
+    lifetime: Infinity,
+    start,
 })