private static BearerTokenError invalidTokenError() {
        return BearerTokenErrors.invalidToken("Bearer token is malformed");
    }
Set this value to configure what header is checked when resolving a Bearer Token.
This value is defaulted to {@link HttpHeaders#AUTHORIZATION}.

This allows other headers to be used as the Bearer Token source such as
{@link HttpHeaders#PROXY_AUTHORIZATION}
@param bearerTokenHeaderName the header to check when retrieving the Bearer Token.
@since 5.4
zlt-commons/zlt-auth-client-spring-boot-starter/src/main/java/com/central/oauth2/common/component/CustomServerBearerTokenAuthConverter.java