# File lib/rhc/rest/client.rb, line 193
        def add_credentials(h)
          if @username
            userpass = "#{@username}:#{@password}"
            # :nocov: version dependent code
            credentials = if RUBY_VERSION.to_f == 1.8
              Base64.encode64(userpass).delete("\n")
            else
              Base64.strict_encode64(userpass)
            end
            # :nocov:
            h["Authorization"] = "Basic #{credentials}"
          end
          h
        end