Added env HTTP_CACHE_MAX_AGE setting

This env setting controls production http cache max age. Default value is '30d' when setting is not given. Max age can be given in many units like seconds(s), minutes(m), hours(h) and days(d).

server/config.js

@@ -6,6 +6,8 @@ const isProduction = process.env.NODE_ENV === 'production';
 
 const defaultPort = isProduction ? 8080 : 3000;
 const port = process.env.PORT || defaultPort;
+// max age can be given in many units like seconds(s), minutes(m), hours(h) and days(d)
+const httpCacheMaxAge = process.env.HTTP_CACHE_MAX_AGE || '30d';
 
 function getAssetHash(filePath) {
   if (!isProduction) return '';
@@ -33,4 +35,5 @@ module.exports = {
   matomoSiteId: process.env.MATOMO_SITE_ID,
   port,
   webpackStylesExtensions: ['css', 'scss'],
+  httpCacheMaxAge,
 };

server/main.js

@@ -24,7 +24,7 @@ if (serverConfig.isProduction) {
   app.use(compression());
 
   // Serve the static assets. We can cache them as they include hashes.
-  app.use('/_assets', express.static(path.resolve(__dirname, '../dist'), { maxAge: '200d' }));
+  app.use('/_assets', express.static(path.resolve(__dirname, '../dist'), { maxAge: serverConfig.httpCacheMaxAge }));
 } else {
   const webpackConfig = require('../config/webpack.development');
   const compiler = webpack(webpackConfig);