Using HTTP Boot with UEFI client

[fai1107 at macrotex.net]

For many years I have been using the traditional PXE boot method to 
build our systems using FAI. We build a boot image using debootstrap and 
serve that image using TFTP. The system-specific boot options are kept 
in files in /srv/tftp/fai/pxelinux.cfg/.

I would like to use HTTP Boot with a UEFI client. What are the changes 
on the FAI server side I need to make to accomplish this?