Ioannis Kakavas 4ea17b76dc Fix credentials encoding for OIDC token request (#43808)
As defined in https://tools.ietf.org/html/rfc6749#section-2.3.1
both client id and client secret need to be encoded with the
application/x-www-form-urlencoded encoding algorithm when used as
credentials for HTTP Basic Authentication in requests to the OP.

Resolves #43709
2019-07-02 13:36:00 +03:00
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