Parse OAuth Authorization header when request omits client secret (#21351) #21374
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Backport #21351
This fixes error "unauthorized_client: invalid client secret" when client includes secret in Authorization header rather than request body. OAuth spec permits both: https://www.rfc-editor.org/rfc/rfc6749#section-2.3.1
Clients in possession of a client password MAY use the HTTP Basic authentication scheme ... Alternatively, the authorization server MAY support including the client credentials in the request-body
Sanity validation that client id and client secret in request are consistent with Authorization header.
Improve error descriptions. Error codes remain the same.