Quick iPXE script:
params && param vram ${vram} && chain -a http://b800.org##params && echo b800.org/${b800id}
usage details
Formats: b800 | b800hex | b800base64 | uri | html | ansi | ascii | utf8 | cp437 | cp437hex | png
iPXE> ifopen
iPXE> chain http://b800.org
http://b800.org... ok
http://b800.org/... ok
new id b800.org/38aqU
iPXE> set b800public 1 && chain http://b800.org
http://b800.org... ok
http://b800.org/... ok
new id b800.org/2AxDg
iPXE> set b800public 1 && chain http://b800.org
http://b800.org... ok
http://b800.org/... ok
new id b800.org/4YidA
iPXE> set b800public 1 && chain http://b800.org
http://b800.org... ok
http://b800.org/... ok
new id b800.org/2XjUd
iPXE> set b800public 1 && chain http://b800.org
http://b800.org... ok
http://b800.org/... ok
new id b800.org/4UBNS
iPXE> set b800public 1 && chain http://b800.org
http://b800.org... ok