examples update and multiple REVERSE_PROXY_* on single site

examples/reverse-proxy-multisite/js-app/index.js

@@ -0,0 +1,12 @@
+const express = require('express')
+const app = express()
+const port = 3000
+
+app.get('/', (req, res) => {
+  res.send('Hello World!')
+})
+
+app.listen(port, () => {
+  console.log(`Example app listening at http://localhost:${port}`)
+})
+

examples/reverse-proxy-multisite/js-app/package.json

@@ -0,0 +1,14 @@
+{
+  "name": "js-app",
+  "version": "1.0.0",
+  "description": "demo",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "express": "^4.17.1"
+  }
+}