rtfsc/connect — comment on commit b7e5186875ce8f3d8ff2dbaa492a9d998c1fd45b
File: lib/connect.js line 92
By yuest:

关于 __defineGetter__ 可以看 [MDN 的文章](https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Object/DefineGetter) 或 [John Resig 的文章](http://ejohn.org/blog/javascript-getters-and-setters/)

在这里是用来延迟加载 middleware