diff --git a/lib/XMLHttpRequest.js b/lib/XMLHttpRequest.js
index 4893913..63b8439 100644
--- a/lib/XMLHttpRequest.js
+++ b/lib/XMLHttpRequest.js
@@ -15,6 +15,11 @@ var Url = require("url");
 var spawn = require("child_process").spawn;
 var fs = require("fs");
 
+exports.defaults = {
+  host: null,
+  port: null
+}
+
 exports.XMLHttpRequest = function() {
   "use strict";
 
@@ -292,7 +297,7 @@ exports.XMLHttpRequest = function() {
       case undefined:
       case null:
       case "":
-        host = "localhost";
+        host = exports.defaults.host || "localhost";
         break;
 
       default:
@@ -330,7 +335,7 @@ exports.XMLHttpRequest = function() {
 
     // Default to port 80. If accessing localhost on another port be sure
     // to use http://localhost:port/path
-    var port = url.port || (ssl ? 443 : 80);
+    var port = url.port || exports.defaults.port || (ssl ? 443 : 80);
     // Add query string if one is used
     var uri = url.pathname + (url.search ? url.search : "");