docs: function applyAuth(authContexts, server, callback) {
      if (authContexts.length === 0) return callback();
      // Get the first auth context
      var authContext = authContexts.shift();
      // Copy the params
      var customAuthContext = authContext.slice(0);
      // Push our callback handler
      customAuthContext.push(function(/* err */) {
        applyAuth(authContexts, server, callback);
      });
  
      // Attempt authentication
      server.auth.apply(server, customAuthContext);
    }