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

@Jay's answer above helped me a lot. In my case I had forgotten to change content type to url-encoded as per the RFC 7662 i.e.

r.Header.Add("Content-Type", "application/x-www-form-urlencoded")