Depending on what level of control you have, you could potentially do
some DNS black magic: have a VPN that sent all client requests for
*.ebscohost.com to server.yourdomain.edu which then used httpd
redirects (or similar) to rewrite those to include the proxy prefix.
You'd need to include an appropriate  certificate in browser config if
you didn't want the HTTPS handshake to fail.

cheers
stuart
--
...let us be heard from red core to black sky

On Fri, 21 Feb 2020 at 09:03, Bob Dougherty <[log in to unmask]> wrote:
>
> Andreas, I think I misunderstood something you wrote: "our solution is to force all connections via the VPN through the proxy."
>
> Can you "force" a connection through the proxy when it didn't start with a proxied web page? Such as the scenarios I mentioned (a link to an article found in an internet search or an email)?
>
> Thanks,
>
> Bob