public AuthServiceBuilder onSuccess(AuthSuccessHandler successHandler) {
        this.successHandler = requireNonNull(successHandler, "successHandler");
        return this;
    }
Sets the {@link AuthSuccessHandler} which handles successfully authorized requests.
By default, the request will be delegated to the next {@link HttpService}.
core/src/main/java/com/linecorp/armeria/server/auth/AuthServiceBuilder.java