How to correctly use the introspection endpoint with identity server 4?

Question

I\'m using Identity Server 4 and I\'m trying to use the introspection endpoint, but just by the docs I\'m not getting it.

The docs just gives this example

Answer 1

Introspection is typically used by APIs to validate an incoming token. Also the introspection endpoint requires authentication per spec.

You need to setup an API secret:

https://identityserver4.readthedocs.io/en/latest/reference/api_resource.html

And then use the api name/secret to authenticate against the introspection endpoint. Either using Basic authentication or posting the values in the form.