code: function makeRequest (url, embed, page) {
      var query = {}
      ,   result = sua.get(url);
      if (embed) query.embed = "true";
      if (page) query.page = page;
      if (!exports.apiKey) throw new Error("No API key.");
      if ('header' === exports.authMode) result.set('Authorization', 'W3C-API apikey="' + exports.apiKey + '"');
      else if ('param' === exports.authMode) query.apikey = exports.apiKey;
      else throw new Error("Invalid authorisation mode.");
      return result.accept("json")
                   .query(query)
      ;
  }
docs: slurping helper