[neilk]

Seems a bit like webhooks?

https://en.wikipedia.org/wiki/Webhook

Although your model is polling rather than making the other server push something.

[IshKebab]

Webhooks are not relevant to this use case.

[oreilles]

Webhooks would be much closer to a sane solution to this use case. Why would you spam a web server asking repeatedly wether something has happened or not, instead of just providing him with an adress so that he can simply let you know in due time ?