"QUIC includes a connection identifier which uniquely identifies the connection to the server regardless of source. This allows the connection to be re-established simply by sending a packet, which always contains this ID, as the original connection ID will still be valid even if the user's IP address changes."
@MatejLach with HTTP/2, your connection would get dropped when going on or off of the VPN, with HTTP/3 it won't, with this id. Note however that with HTTP/2 (as for 1 and 1.1), this connection loss will make the browser reissue the same requests, including cookies (and possibly other identifying headers), so both sessions can be linked fairly easily by remote server. If using a VPN to hide your ip from a server, you should not go on and off your VPN, as it defeat the whole purpose.
@MatejLach I would recommend having a separate browser for VPN and non-VPN access to internet if you really want to do both
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