ACME HTTP-01 Standalone Challenge Handler

This package provides a lightweight, in-memory HTTP-01 challenge handler for ACME (Automated Certificate Management Environment) clients in Node.js, primarily designed for use with Let's Encrypt. Compatible with ACME.js and Greenlock.js, it specifically addresses the `http-01` challenge type required for domain validation. Currently at version 3.0.5, it emphasizes simplicity and embeddability, featuring zero external dependencies and a minimal codebase (under 150 lines). Its key differentiators include the ability to operate standalone without a dedicated web server and its entirely in-memory operation, making it suitable for quick setups or testing environments. The package is built with Node.js v6 compatibility in mind, offering broad support, though primarily exports CommonJS modules.