[minor] Dont use `.bind()`

lib/node-http-proxy.js

@@ -103,11 +103,11 @@ exports.createServer = function () {
   proxy   = new HttpProxy(options);
   handler = callback 
     ? function (req, res) { callback(req, res, proxy) }
-    : proxy.proxyRequest;
+    : function (req, res) { proxy.proxyRequest(req, res) };
   
   server  = options.https
-    ? https.createServer(options.https, handler.bind(proxy))
-    : http.createServer(handler.bind(proxy));
+    ? https.createServer(options.https, handler)
+    : http.createServer(handler);
 
   //server.on('close', function () {
   //  proxy.close();