### Describe the bug `fastapi.security.HTTPDigest` is actually not implementing HTTP Digest Access Authentication as specified by [RFC 7616](https://tools.ietf.org/html/rfc7616) or (the obsoleted) [RFC 2617](https://tools.ietf.org/html/rfc2617). ### To Reproduce Read the relevant RFCs or maybe try it out using `curl --digest`. ### Expected behavior Exactly as specified in [RFC 7616](https://tools.ietf.org/html/rfc7616).
