Boot http://www.netboot.me from pxelinux

[Andrew]

Hello, sorry for my English.
How can I add to me pxelinux menu boot from netboot.me ?
I try:

LABEL netboot
MENU LABEL netboot.me (boot linx from internet)
KERNEL http://static.netboot.me/gpxe/netbootme.kpxe

and

LABEL netboot
MENU LABEL netboot.me (boot linx from internet)
KERNEL ISO/memdisk
append raw iso
initrd http://static.netboot.me/gpxe/netbootme.iso

And I heve same error:
URL syntax, but gPXE extensions not detected

Local booting netbootme.kpxe successfully.