Check if apex is being run in Rest Resource

Question

Is there a way to check if being run in RestResource Context? I have a script that posts messages to an endpoint but we can end up in an infinite loop scenario as they are now posting their comments to us. How can I check for this flag or flag this during runtime?

Ideally something like:

Test.isRunningTest()

Answer 1

You can check if you're in a REST call via:

Request.getCurrent().getQuiddity() == Quiddity.REST

You can read more about the Request object, as well as the possible values for Quiddity.