[gPXE] environment variable expansion in 'filename'?

[Jarrod Johnson]

If I put into filename something like 'http://${next-server}/filename" in
dhcp, it currently doesn't work.  Any plans to change, am I missing
something?  I'm dealing with a particular case where it would be easiest if
the server part of the url inherited from the subnet in dhcp, but the rest
of the path needs to be host-specific.
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