httpfail — HTTP failure simulator

  GET /{code}              return that status, e.g. /500, /429
  GET /flaky?rate=0.3      randomly fail (30%) — test your retry logic
  GET /seq/503,503,200     respond in sequence (cookie-tracked), then loop
  GET /drip?duration=5000  slow-streamed response — test timeouts

Common params for /{code} and /flaky:
  delay=ms                 delay before responding (max 30s)
  body=...                 custom response body
  type=application/json    custom Content-Type
  h=Retry-After:120        custom header (repeatable)

All methods supported. CORS enabled. No auth, no logging.