title: List of available Rails http headers (like ":success", ":created", and ":bad_request"). Where is it?
body: <p>You can <a href="http://guides.rubyonrails.org/layouts_and_rendering.html#using-head-to-build-header-only-responses" rel="noreferrer">use <code>head</code> to build header-only responses</a>. The Rails guide is very helpful in pointing out that you can send a <code>:bad_request</code> or <code>:created</code> header. Where is a list of all of these Rails HTTP header aliases?</p>