[keycloak-user] Keycloak.js cannot catch the case when keycloak server is down

Hello, I am trying to implement an error handling mechanism for my public access type JS client, however the current implementation of keycloak.js does not provide such feature. To be specific, I want to achieve the following steps: 1. Initializing the JS client using keycloak.init({onLoad: 'login-required'}) 2a. If the initialization succeeds, store keycloak.token to window.localStorage. 2b. If initialization fails due to network issues (i.e. the keycloak server is down), use the keycloak token stored in the localStorage instead. In this way, users that has frequently logged in to our system can still be authenticated if the keycloak server is down, which buys us time recovering the authentication service. However, I cannot implement the measure above because the current keycloak.js does not reject keycloak.init()'s promise when there is network error. Specifically, when keycloak server is down, invoking postMessage() in checkLoginIframe() will throw exception [1]. However the exception is not handled by checkLoginIframe(), so processInit() can do nothing about the initPromise [2]. As an alternative, I can implement the following health check instead: 1. Send an ajax request to `<keycloak-server>/realms/<realm>/.well-known/openid-configuration` to test if the keycloak is alive. 2a. If keycloak is alive, do keycloak.init() 2b. If not, use the token stored in localStorage This alternative costs one extra RTT between the keycloak server and the JS client. I'd like to know: 1. Is it possible for keycloak.js to catch network errors so that we can properly handle the network error? 2. If the answer to 1 is no, is there any alternative better the one above? Thanks, Johnson [1] Relevant code: https://github.com/keycloak/keycloak-js-bower/blob/master/dist/keycloak.j... [2] Relevant code: https://github.com/keycloak/keycloak-js-bower/blob/master/dist/keycloak.j...