HTTP Authorization Header Parser and Formatter

The `auth-header` library provides a robust solution for parsing and formatting HTTP `Authorization` and `WWW-Authenticate` headers. It supports various authentication schemes, including Basic, Digest, AWS, and Bearer/OAuth, adhering primarily to RFC7235 while also accommodating certain legacy formats by being less strict in its parsing. Currently at version 1.0.0, the library offers a stable API, though it appears to be in a maintenance state with no new feature development or active bug fixes since 2017. Its core differentiator lies in abstracting the complexities of these historically inconsistent HTTP headers, offering a standardized programmatic interface for their manipulation, which is a significant improvement over manual string parsing.