badgen-service/libs/serve-badge.js

const badgen = require('badgen')

module.exports = function serveBadge (req, res, params) {
  params.style = req.headers.host === 'flat.badgen.net' ? 'flat' : undefined

  res.writeHead(200, {
    'Content-Type': 'image/svg+xml;charset=utf-8',
    'Cache-Control': 'public, max-age=360, s-maxage=86400'
  })
  res.end(badgen(params))
}