Represents authentication credentials supplied with a request. Credentials can either be
Credentials.Missing or can be Credentials.Provided in which case an identifier is
supplied and a function to check the known secret against the provided one in a secure fashion.
Represents authentication credentials supplied with a request. Credentials can either be Credentials.Missing or can be Credentials.Provided in which case an identifier is supplied and a function to check the known secret against the provided one in a secure fashion.