Add edge cacheing

controllers/about.js

@@ -1,4 +1,8 @@
-module.exports = (req, res) => res.render('about.html', {
+module.exports = (req, res) => {
+	const ONE_MONTH_IN_SECONDS = 60 * 60 * 24 * 30;
+	res.setHeader('Cache-Control', `s-maxage=${ONE_MONTH_IN_SECONDS}, stale-while-revalidate`);
+	res.render('about.html', {
 		bodyClass: 'about',
 		pageTitle: 'About'
-});
+	})
+};

controllers/listing.js

@@ -17,12 +17,16 @@ module.exports = (req, res, next) => {
 	}
 
 	tor.listNodes(query)
-		.then(nodes => res.render('listing.html', {
+		.then(nodes => {
+			const ONE_HOUR_IN_SECONDS = 60 * 60;
+			res.setHeader('Cache-Control', `s-maxage=${ONE_HOUR_IN_SECONDS}, stale-while-revalidate`);
+			res.render('listing.html', {
 				pageTitle: req.query.s ? `Search: ${req.query.s}` : false,
 				title,
 				nodes,
 				numOfNodes: query.limit
-		}))
+			})
+		})	
 		.catch(err => {
 			if (err.statusCode === 400 && req.query.s) {
 				err.statusMessage = 'Bad Search Query';

controllers/node.js

@@ -15,6 +15,8 @@ module.exports = (req, res, next) => {
 				throw err;
 			}
 
+			const ONE_HOUR_IN_SECONDS = 60 * 60;
+			res.setHeader('Cache-Control', `s-maxage=${ONE_HOUR_IN_SECONDS}, stale-while-revalidate`);
 			res.render('node.html', {
 				pageTitle: `${data[0].type}: ${data[0].nickname}`,
 				node: data[0],