# File lib/oauth2/strategy/web_server.rb, line 14
      def get_access_token(code, options = {})
        response = @client.request(:post, @client.access_token_url, access_token_params(code, options))

        params   = MultiJson.decode(response) rescue nil
        # the ActiveSupport JSON parser won't cause an exception when
        # given a formencoded string, so make sure that it was
        # actually parsed in an Hash. This covers even the case where
        # it caused an exception since it'll still be nil.
        params   = Rack::Utils.parse_query(response) unless params.is_a? Hash

        access   = params['access_token']
        refresh  = params['refresh_token']
        expires_in = params['expires_in']
        OAuth2::AccessToken.new(@client, access, refresh, expires_in)
      end