[syslinux] PXELINUX and http?

[Virtual Xmas]

According to the Changelog for 5.01, pxelinux.0 can load boot files via http.  But I can't get it to work.

Specifying http as my boot path, just gives me an invalid file or directory error.

ie:

KERNEL http://10.48.128.56/rhel-server/rhel-server-6.4-x86_64/vmlinuz

If I do a wget on the http path, I can get vmlinuz just fine.

What am I doing wrong?

I also tried copying lpxelinux.0 over pxelinux.0, and all I get is the boot: prompt.  ie, my menu doesn't work.  Is lpxelunix.0 not supposed to be a drop in replacement for pxelinux.0?

I am using syslinux 6.03pre-6, but get the same errors with 6.02.

Thanks..