Build a impression tracker using my own website instead of third party?

I am going to put ads on Google or other platforms, and I'd like to track ad impressions by myself. That is, when my ad is loaded by a client, I want the client directly sends requests (to request the tracking pixel) to my webserver, so I can look at the request headers and do some analysis all by myself.

It seems Google only allow pixel trackers from some specific third parties. I wonder if it is possible to do such tracking on Google at all. If not, is there any other advertisement platforms that allow such action?