Simulating cookie responses

Although Mirage allows setting headers in a response, the XMLHttpRequest spec explicitly forbids access to the Set-Cookie and Set-Cookie2 headers. As a result, Mirage responses cannot set cookies via headers.

However, you can simulate receiving cookies from an ajax call at the browser level by setting them in a route function handler:

this.post("/users/login", schema => {
  // log in for 24 hours
  let now = new Date()
  let cookieExpiration = new Date(now.getTime() + 24 * 3600 * 1000)
  document.cookie = `remember_me=cookie-content-here; domain=.dev-domain; path=/; expires=${cookieExpiration.toUTCString()};`

  return schema.users.find(1)
})

Your JavaScript client code will now have access to any cookies set using document.cookie.