I am doing bug bounty on hackerone i finded a bug while scanning via nuclei templates host-reflection-body but didn’t know about exploit or how to make poc i google it but didn’t find anything about it can someone help me
Template link :- https://github.com/panch0r3d/nuclei-templates/blob/master/header_reflection_body.yaml

I try to exploit and make poc to report it but i didn’t know about this bug