start serve view and static assets.

If has prefix either api or view of static assets, it will be served self without other check, so it`s a good idea to set prefix if you want to have a good performance.

Then it will check the extension of the pathname, if its optioned such as ejs`, it will be served view, otherwise it will be served static assets.

But if there is index.html in the static assets, it will be served first before the view.