see OIDCAuthenticationFilter line 336
@ -68,7 +68,7 @@ public class UriEncodedClientUserDetailsService implements UserDetailsService {
if (client != null) {
String encodedPassword = UriUtils.encodeQueryParam(Strings.nullToEmpty(client.getClientSecret()), "UTF-8");
String encodedPassword = UriUtils.encodePathSegment(Strings.nullToEmpty(client.getClientSecret()), "UTF-8");
if (config.isHeartMode() || // if we're running HEART mode turn off all client secrets
(client.getTokenEndpointAuthMethod() != null &&