You are expected to use DHCP option 209 aka configuration-file and DHCP option 210 aka path-prefix to get the URI your client can request from the server (along with the tftp-server-name):
You are expected to use DHCP option 209 aka configuration-file and DHCP option 210 aka path-prefix to get the URI your client can request from the server (along with the tftp-server-name):