A simple, quick, cross-platform API mock server that returns examples
specified in an API description document. Features include:

- OpenAPI 3.x support
  - Uses operation `examples` or generates examples from `schema`
- Load from a URL or local file (auto reload with `--watch`)
- CORS headers enabled by default
- Accept header content negotiation
  - Example: `Accept: application/*`
- Prefer header to select response to test specific cases
  - Example: `Prefer: status=409`
- Server validation (enabled with `--validate-server`)
  - Validates scheme, hostname/port, and base path
  - Supports `localhost` out of the box
- Request parameter & body validation (enabled with `--validate-request`)
- Configuration via:
  - Files (`/etc/apisprout/config.json|yaml`)