I want to make it a http proxy in the beginning. But I found it hard to do so. Then I post every to it, but haven't change the name. But it works like a proxy,

I want to make it a http proxy in the beginning. But I found it hard to do so. Then I post every to it, but haven't change the name. But it works like a proxy, that any request with `fetch_type == 'js'` would be fetched through phantomjs and the response back to tornado_fetcher.