[examples] added concurrent proxy example

examples/concurrent-proxy.js

@@ -0,0 +1,36 @@
+var http = require('http'),
+    httpProxy = require('../lib/http-proxy');
+
+var connections = [],
+    go;
+
+
+//
+// Target Http Server
+//
+// to check apparent problems with concurrent connections
+// make a server which only responds when there is a given nubmer on connections
+//
+http.createServer(function (req, res) {
+  connections.push(function () {
+    res.writeHead(200, { 'Content-Type': 'text/plain' });
+    res.write('request successfully proxied to: ' + req.url + '\n' + JSON.stringify(req.headers, true, 2));
+    res.end();
+  });
+  
+  process.stdout.write(connections.length + ', ');
+  
+  if (connections.length > 10 || go) {
+    go = true;
+    while (connections.length) {
+      connections.shift()();
+    }
+  }
+}).listen(9000);
+console.log("Web server listening on port 9000");
+
+//
+// Basic Http Proxy Server
+//
+httpProxy.createProxyServer({target:'http://localhost:9000'}).listen(8000);
+console.log("Proxy server listening on port 8000");