A fixed-capacity string class template that provides a std::string-like interface without dynamic memory allocation. It demonstrates careful handling of small-string optimization, constexpr construction, and full iterator support. Reusable as a standalone component for any project needing a stack-allocated string with bounded size.

A utility to concatenate multiple buffer sequences into a single viewable buffer sequence without copying. It uses a tuple of sequences and provides forward traversal. This is a self-contained pattern useful for any networking library or I/O code that needs to combine scatter-gather buffer lists efficiently.

Provides classes and functions for serializing HTTP chunked transfer encoding: chunk_header, chunk_body, chunk_last, and basic_chunk_extensions. These are allocator-aware and designed for incremental output. The implementation is independent of the rest of Beast's HTTP machinery and can be extracted for projects needing raw chunked transfer support.

A UTF-8 validator used for WebSocket message validation. It processes bytes sequentially and tracks state for incomplete sequences. Though part of WebSocket internals, it is self-contained and can be used independently for UTF-8 validation in any C++ project that requires RFC 3629 compliance without external dependencies.