HTTP::Thin is a thin wrapper around HTTP::Tiny adding the ability to pass in HTTP::Request objects and get back HTTP::Response objects. The maintainers of HTTP::Tiny, justifiably, don't want to have to maintain compatibility but many other projects already consume the HTTP::Message objects. This is just glue code doing what it does best.
Binary packages can be installed with the high-level tool pkgin (which can be installed with pkg_add) or pkg_add(1) (installed by default). The NetBSD packages collection is also designed to permit easy installation from source.
The pkg_admin audit command locates any installed package which has been mentioned in security advisories as having vulnerabilities.
Please note the vulnerabilities database might not be fully accurate, and not every bug is exploitable with every configuration.
Problem reports, updates or suggestions for this package should be reported with send-pr.