[chef] bootstrap a node through chefserver API in ruby file

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hi,
how to bootstrap a node in AWS,hp or openstack using chefserver API without
workstation it means not using knife command.....i have to create a node in 
any
provider and register with chefserver [through API only] in ruby ...if it is
possible means pls post any sample code or any idea

Thanks and Regards,
Ganesan.A