Custom Parameter Handler
Summary: Custom Parameter Handler is a Burp Suite extension, version 3.0a, that lets a user modify any part of an HTTP message rather than only the name=value parameters that macros typically support. It requires Jython 2.7.0, was last updated on 21 February 2022, and is published by third-party authors @elespike and @eth0up, with PortSwigger stating it makes no warranty about the quality or usefulness of extensions.
Bottom line: This is a third-party extension last updated in February 2022 that rewrites arbitrary parts of HTTP messages inside the tool your testers use, and PortSwigger explicitly disclaims any warranty on extensions written by third-party users.
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