A minimal, self-contained Perl module that generates accessor methods (getter/setter) for class attributes without requiring inheritance. It uses a simple closure-based approach, avoiding the overhead of full metaclass systems. This is a clean, reusable utility that can be extracted into any Perl project needing lightweight attribute accessors.

A middleware component that conditionally applies another middleware based on a runtime condition (coderef or regex). It demonstrates a clean decorator pattern where the condition is evaluated per-request. The implementation is tight, well-documented, and can be reused as a generic conditional wrapper for any middleware stack.

A versatile URL dispatcher that maps requests to different PSGI applications based on HTTP host and path prefix. It supports both exact and prefix matching, and handles location inheritance. The implementation is a self-contained, reusable routing component that could be extracted into other web frameworks or reverse proxy applications.

A reusable test suite that validates PSGI handler implementations for correctness. It tests streamed and non-streamed responses, content types, charsets, and other PSGI specification requirements. This is a valuable testing asset that can be used by any PSGI server implementation to ensure compliance, demonstrating a portable testing pattern.