Dropbox WebHook

dropbox.js

// How Dropbox handles webhooks: https://www.dropbox.com/developers/reference/webhooks
  router.get('/api/dropbox/webhook', function (ctx, next) {
    return new HTTPRequest({ ctx }).handle((request) => {
      ctx.set('Content-Type', 'text/plain')
      ctx.set('X-Content-Type-Options', 'nosniff')
      ctx.body = request.data.challenge
    })
  })