How can I configure IIS so that it doesn't emit certain custom headers in case of http, but emits them in case of https?

Question

IIS

I'm going to add HSTS support for the site. To do this, I added the appropriate header, but the trouble is that I can’t get into the preinstalled chrome list because of a warning on the site https://hstspreload.appspot.com/

The site swears that the server sends Strict-Transport-Security headers even with http connections.