Extra loggings for SPA implementation

It was reported that the channel settings options are no longer visible once spa_url property is changed from placeholder values to setting it directly (e.g. http://localhost:300)

Placeholders configured as per below article:

https://xmdocumentation.bloomreach.com/library/concepts/spa-integration/configure-hst-for-spa-sdk.html

The idea is to add extra debugging or something similar and we can provide a forked class to deploy to see why the project has the issues.