decode_credentials

# File actionpack/lib/action_controller/metal/http_authentication.rb, line 248
      def decode_credentials(header)
        ActiveSupport::HashWithIndifferentAccess[header.to_s.gsub(/^Digest\s+/, "").split(",").map do |pair|
          key, value = pair.split("=", 2)
          [key.strip, value.to_s.gsub(/^"|"$/, "").delete("'")]
        end]
      end