Can anyone explain to me what is pre_shared_key TLS extension and what is it relation with Session Ticket TLS extension because I observed that when the pre_shared_key extension is present in the TLS Client Hello message the Session Ticket extension is absent
... when the pre_shared_key extension is present in the TLS Client Hello message the Session Ticket extension is absent
The first one is session resumption with TLS 1.3, the second with TLS 1.2 and lower. There are several information about this protocol change on the internet, like TLS Session Resumption TLS 1.3 uses 0-RTT Handshakes.