public Ssl setClientAuth(@Nullable ClientAuth clientAuth) {
        this.clientAuth = clientAuth;
        return this;
    }
Sets whether the client authentication is not none ({@link ClientAuth#NONE}), optional
({@link ClientAuth#OPTIONAL}) or required ({@link ClientAuth#REQUIRE}).
spring/boot3-autoconfigure/src/main/java/com/linecorp/armeria/spring/Ssl.java