mountebank could support that through stub resolver injection (http://www.mbtest.org/docs/api/injection http://www.mbtest.org/docs/api/injection). Basically, i

mountebank could support that through stub resolver injection (http://www.mbtest.org/docs/api/injection http://www.mbtest.org/docs/api/injection). Basically, in addition to returning a response, you can inject some javascript that would call back after some time. Tricky, but possible.