[examples] Added simple load balancer example

Author: Marak

examples/balancer/simple-balancer.js

@@ -0,0 +1,36 @@
+var httpProxy = require('../../lib/node-http-proxy');
+//
+// A simple round-robin load balancing strategy.
+// 
+// First, list the servers you want to use in your rotation.
+//
+var addresses = [
+  {
+    host: 'ws1.0.0.0',
+    port: 80
+  },
+  {
+    host: 'ws2.0.0.0',
+    port: 80
+  }
+];
+
+httpProxy.createServer(function (req, res, proxy) {
+  //
+  // On each request, get the first location from the list...
+  //
+  var target = addresses.shift();
+
+  //
+  // ...then proxy to the server whose 'turn' it is...
+  //
+  console.log('balancing request to: ', target);
+  proxy.proxyRequest(req, res, target);
+
+  //
+  // ...and then the server you just used becomes the last item in the list.
+  //
+  addresses.push(target);
+}).listen(8000);
+
+// Rinse; repeat; enjoy.