adding url rewrite demo

Author: jkyberneees

demos/url-rewrite.js

@@ -0,0 +1,20 @@
+'use strict'
+
+const gateway = require('../index')
+const PORT = process.env.PORT || 8080
+
+gateway({
+  routes: [{
+    pathRegex: '',
+    prefix: '/customers/:customerId',
+    target: 'http://localhost:3000',
+    urlRewrite: ({ params: { customerId } }) => `/users/${customerId}`
+  }]
+}).start(PORT).then(server => {
+  console.log(`API Gateway listening on ${PORT} port!`)
+})
+
+const service = require('restana')({})
+service
+  .get('/users/:id', (req, res) => res.send('Hello ' + req.params.id))
+  .start(3000).then(() => console.log('Service listening on 3000 port!'))