roosevelt/defaultErrorPages/controllers/503.js

🧸 MVC web framework for Node.js designed to make Express easier to use.

const fs = require('fs-extra')
const path = require('path')
const template = require('../../lib/tools/templateLiteralRenderer')
const errorPage = fs.readFileSync(path.join(__dirname, '../views/503.html'))

module.exports = (app, req, res) => {
  const model = {
    url: req.url,
    mainDomain: req.headers['x-forwarded-host'] || req.headers.host,
    appVersion: req.app.get('appVersion')
  }
  let errorTemplate = template(errorPage, model)
  if (process.env.NODE_ENV === 'development' && req.app.get('routes').length) errorTemplate = errorTemplate.replace('</footer>', `${req.app.get('debugMarkup')}</footer>`)
  res.setHeader('Connection', 'close')
  res.status(503)
  res.send(errorTemplate)
}