every space in menu.ipxe is used and shown as %20 which leads to unusable kernelparam definition

[elschman]

Describe the bug
my menu.ipxe looks following

set params splash=silent proxmox-start-auto-installer
set iso proxmox-automated.iso
set local_endpoint http://192.168.0.254/pxeauto/
set kernel_url ${local_endpoint}/
set proxmox_version 8.2-1
imgfree
kernel ${kernel_url}linux26 vga=791 initrd=initrd ${cmdline}
initrd ${kernel_url}initrd
boot

but during boot the ipxe failed cos
http://192.168.0.254/pxeauto/linux26%20vga=791%20initrd=initrd%20${cmdline} not found

ipxe wrote the full %20 stuff. someone converted spaces into %20 .. is that an http server issue of openwrt which serves the menu.ipxe ?

[elschman]

if I use directly
kernel http://192.168.0.254/pxeauto/linux26 vga=791 initrd=initrd

it works like a charm
even ${kernel:string} doesnt work ... same %20 shown.
So it looks like uristring=string

How can I change this behavior?