badhttp: The Server That Misbehaves on Purpose

Field notes

badhttp uses parameterized routes to make specific protocol failures repeatable rather than leaving them to chance. Its catalogue includes status and Retry-After controls, delayed and chunked responses, seeded failure sequences, malformed JSON variants, and bodies that terminate before the declared Content-Length. The page also exposes /openapi.json and /llms.txt for machine-oriented discovery. Most routes are described as free to call, while /402 provides an optional test-USDC payment path.