$ _SERVER ['PHP_AUTH_PW']相当于rails上的ruby是什么？

In PHP, we can use $_SERVER['PHP_AUTH_PW'] to get the password entered by the user from apache basic authentication.

How do we go by doing this in Rails?

EDIT: $_SERVER['PHP_AUTH_USER'] is equivalent to request.env['REMOTE_USER'].

What eventually did it for me is this:

require 'base64'

user_pass = Base64.decode64(request.authorization.split(' ')[1])
username = user_pass.split(':')[0]
password = user_pass.split(':')[1]