Re: deb http://apt.postgresql.org/pub/repos/apt/ bookworm-pgdg main 15

> The problem seems to go away when I change the sources list to utilise
> https:// instead of the previous default, http://

I don't see that issue on the three Ubuntu machines I have Postgres
installed from PGDG.

My guess you are seeing this due to apt-cacher-ng.

 From here:

https://www.unix-ag.uni-kl.de/~bloch/acng/html/howtos.html#ssluse

"It is possible to have encrypted access to remote sites via HTTPS
protocol with recent versions of apt-cacher-ng if the OpenSSL support
was enabled at compile time. However this leads certain side effects and
complications; due to the nature of the HTTPS connection model, it is
not possible to act as an intermediate server (e.g. caching proxy) by
the same rules as with HTTP:"

"Considering these difficulties, there are three (and a half) methods to
use SSL."