[tech] IPv6 addresses in URLs

[Stephane Bortzmeyer]

On Thu, Apr 15, 2021 at 08:51:33PM +0000,
 nervuri <nervuri@disroot.org> wrote 
 a message of 40 lines which said:

> No SNI vs empty SNI - we could test to see if servers have a problem
> with either.

For instance, egsam.glv.one reacts badly when you don't send a SNI:

% gnutls-cli -p 1965 --disable-sni --insecure egsam.glv.one 
Processed 0 CA certificate(s).
Resolving 'egsam.glv.one:1965'...
Connecting to '52.51.189.88:1965'...
*** Fatal error: The TLS connection was non-properly terminated.

While it works otherwise.