I noticed that there's a whole bunch of different content types, some of them seem redundant.

Wouldn't a js file that's served as `text/plain` work just as well as if it was served with `text/javasctipt`?

I plan on making a page that's serve-able as a `ajax`/`json`/`jsonp` file (with or without a callback) or as a plain page that users on a dumb phone or with no `js` can view as a text file.

Is there any disadvantage as always displaying a page as `text/plain` ? Will it ever be a problem if I'm getting it as a script? What about the inverse?