Notifications locations

Hi all,
I see we have more than one option to configure on a reverse proxy but idk what the other options do, or if they are important…

Could you tell me whats the point of use the other 2 locations?

/vaultwarden ----> 443
Web-Vault

/vaultwarden/notifications/hub/negotiate ----> 443
/vaultwarden/notifications/hub ----> 3012

TY.