Session Resumption with PSK?

[doesdev]

I've been banging my head against a wall for a few days trying to get session resumption working in accordance with the docs via TLS 1.3. It turns out the docs only cover two resumption methods (Session IDs and Tickets) both of which are obsoleted in TLS 1.3.

So it seems PSK is the way. However, the PSK documentation is similarly lackluster. I'm going to continue digging to see if and how I can get session resumption working with PSK but I wanted to see if anyone here has some experience with this one.

Specifically I'm using it for an FTPS server (via ftp-srv). That said, even when simply spinning up an HTTPS server and hitting it with the OpenSSL command specified in the docs (openssl s_client -connect localhost:443 -reconnect) I get no resumption, only new connections.

So, if anyone has any examples or pointers on getting session resumption working, in particular resumption via the key_share extension I would be extremely grateful.

Updated with issue link

I created an issue for this as the more I dig the more it appears that PSK based session resumption is not supported at all within Node: nodejs/node#39691