Nginx Signature exposed on Purge

[anjali-readwhere]

I have two issues.

1. I want to disable the /purge request for all the non logged in users in wordpress.
2. Nginx signatures are getting exposed on /purge/ requests and I want to disable it for any successful purge.I have disabled the exposure of nginx globally but somehow it is getting exposed on successful purge requests.

Wordpress version: 6.6
Plugin Version: 2.2.5