Consider providing a shortcut for getting an error

[golddranks]

Having abort(something) is a wonderful shortcut! Let's have more of those.
It's quite common to have patterns like this:

let conn = ganbare::db_connect().map_err(|_| abort(500).unwrap_err())?;

Here, inside the map_err(), the return value ofabort(500) is too much – only the contents of the Err part of the Result is needed. That's why we need to do unwrap_err(). It's like creating an error, wrapping it up, tearing it open, just to wrap it up for returning, again.

Consider having a shortcut for creating http errors concisely :) How about http_err(500) or something like that?