# File lib/aws/sts.rb, line 151
    def get_session(method, opts = {})
      opts[:duration_seconds] = opts.delete(:duration) if
        opts[:duration]
      resp = client.send(method, opts)
      credentials = resp[:credentials].dup
      session_opts = {
        :credentials => credentials,
        :expires_at => credentials.delete(:expiration),
      }
      yield(resp, session_opts)
    end