diff --git a/lib/plugins/cookies.js b/lib/plugins/cookies.js
index 521f431..39b2f61 100644
--- a/lib/plugins/cookies.js
+++ b/lib/plugins/cookies.js
@@ -2,35 +2,46 @@
 var net = require('net');
 
 
-function cookiesPlugin(rail, opt_options) {
-  opt_options = opt_options || {};
 
-  var pluginOptions = {
-    jar: opt_options || {}
-  };
+function CookiesPlugin(rail, options) {
+  if (!(this instanceof CookiesPlugin)) {
+    return new CookiesPlugin(rail, options);
+  }
+  this._rail = rail;
+
+  this.jar = options.jar || {};
+
+  this._setup();
+}
+module.exports = CookiesPlugin;
+
+
+CookiesPlugin.prototype._setup = function() {
+  var self = this;
+  var rail = this._rail;
 
-  // after configure()
   rail.on('plugin-configure', function(call, options) {
-    set(pluginOptions.jar, options);
+    if (options.cookies !== false) {
+      self._setHeader(options);
+    }
   });
 
-  // on response
   rail.on('plugin-response', function(call, options, response) {
-    parse(pluginOptions.jar, options, response);
+    if (options.cookies !== false) {
+      self._parseHeaders(options, response);
+    }
   });
-
-  return pluginOptions;
-}
-module.exports = cookiesPlugin;
+};
 
 
-function parse(jar, options, response) {
+CookiesPlugin.prototype._parseHeaders = function(options, response) {
   var i, j, p;
   var tokens, cookie;
   var domain = options.request.host;
   var cookies = response.headers['set-cookie'];
+  var jar = this.jar;
 
-  if (!cookies || options.cookies === false) {
+  if (!cookies) {
     return;
   }
 
@@ -67,19 +78,16 @@ function parse(jar, options, response) {
     jar[domain][cookie.name] = cookie;
     response.cookies[cookie.name] = cookie;
   }
-}
+};
 
 
-function set(jar, options) {
+CookiesPlugin.prototype._setHeader = function(options) {
   var domain = options.request.host;
   var cookies = [];
   var i, keys, tokens;
   var now = Date.now();
   var expired = 0;
-
-  if (options.cookies === false) {
-    return;
-  }
+  var jar = this.jar;
 
   if (net.isIP(domain) > 0) {
     tokens = [];
@@ -116,4 +124,4 @@ function set(jar, options) {
   if (cookies.length > 0) {
     options.request.headers.Cookie = cookies.join('; ');
   }
-}
+};