RocketChat/Rocket.Chat

import { Meteor } from 'meteor/meteor';
import { WebApp } from 'meteor/webapp';

import { settings } from '../../../settings/server';

Meteor.startup(() => {
    return WebApp.connectHandlers.use('/robots.txt', (req, res /* , next*/) => {
        res.writeHead(200);
        res.end(settings.get('Robot_Instructions_File_Content'));
    });
});