A WebFinger client for Ruby. Supports `application/xrd+xml` and `application/jrd+json` responses. Raises `Goldfinger::NotFoundError` on failure to fetch the Webfinger or XRD data, can also raise `HTTP:Error` or `OpenSSL::SSL::SSLError` if something is wrong with the HTTPS connection it uses.
- **Does not** fall back to HTTP if HTTPS is not available
- **Does** check host-meta XRD, but *only* if the standard WebFinger path yielded no result