support old (port,host) and (options) style when using middlewares

lib/node-http-proxy.js

@@ -112,6 +112,7 @@ exports.getMaxSockets = function () {
 exports.setMaxSockets = function (value) {
   maxSockets = value;
 };
+
 //
 // stack
 // adapted from https://github.com/creationix/stack
@@ -122,15 +123,16 @@ function stack (middlewares, proxy) {
   middlewares.reverse().forEach(function (layer) {
     
     var child = handle;
-    var next = function (err) {
-        if (err) {
-          throw err;
-          //return error(req, res, err); 
-        }
-        child(req, res);
-      }
-    next.__proto__ = proxy;
     handle = function (req, res) {
+      var next = function (err) {
+          if (err) {
+            throw err;
+            //TODO: figure out where to send errors.
+            //return error(req, res, err); 
+          }
+          child(req, res);
+        }
+      next.__proto__ = proxy;
       layer(req, res, next);
     };
   });
@@ -167,11 +169,6 @@ exports.createServer = function () {
 
   var proxy = new HttpProxy(options);
 
-  if(middleware.length)
-    //handler = callback = middleware.shift()
-  //else if (middleware.length)
-    handler = callback = stack(middleware, proxy);
-
     if (port && host) {
       //
       // If we have a target host and port for the request
@@ -183,6 +180,8 @@ exports.createServer = function () {
           host: host
         });
       }
+      if(middleware.length)
+        middleware.push(handler)
     }
     else if (proxy.proxyTable) {
       //
@@ -192,13 +191,21 @@ exports.createServer = function () {
       handler = function (req, res) {
         proxy.proxyRequest(req, res);
       }
+      if(middleware.length)
+        middleware.push(handler)
     }
-    else if (!handler) {
-      //
-      // Otherwise this server is improperly configured.
-      //
-      throw new Error('Cannot proxy without port, host, or router.')
-    }
+
+  if(middleware.length)
+    //handler = callback = middleware.shift()
+    //else if (middleware.length)
+    handler = callback = stack(middleware, proxy);
+
+  if (!handler) {
+    //
+    // Otherwise this server is improperly configured.
+    //
+    throw new Error('Cannot proxy without port, host, or router.')
+  }
 
   server = options.https 
     ? https.createServer(options.https, handler)