private CompletableFuture<LoginResult> loginInternal() {
        return webClient.prepare().post("/v1/auth/login")
                        .content(MediaType.FORM_DATA, queryParamsForLogin)
                        .asJson(LoginResult.class)
                        .as(HttpEntity::content)
                        .execute();
    }
A Nacos client that is responsible for
<a href="https://nacos.io/en-us/docs/auth.html">Nacos Authentication</a>.
nacos/src/main/java/com/linecorp/armeria/internal/nacos/LoginClient.java