code: function getAuthorizationData(config, req) {
      let data = null,
        types = Object.keys(config);
      for (let i = 0; i < types.length; i++) {
        let authType = types[i],
          authName = config[authType];
        if (authType === 'header') {
          try {
            let tmp = req.headers[authName] || req.headers[authName.toLowerCase()] || null;
            if (typeof tmp !== 'string' || !tmp) throw 1;
            if (tmp.indexOf('Bearer ') === 0) {
              tmp = tmp.substr(7);
            }
            tmp = tmp.trim();
            if (tmp === '') throw 1;
            data = tmp;
            break;
          } catch (e) {
          }
        }
        if (authType === 'cookie') {
          try {
            let tmp = cookie.parse(req.headers['cookie']);
            if (typeof tmp[authName] !== 'string') throw 1;
            tmp = tmp[authName].trim();
            if (tmp === '') throw 1;
            data = tmp;
            break;
          } catch (e) {
          }
        }
      }
      return data;
    }
docs: /*
  Returns the authorization information from a request,
  based on the configured values.