Looks like an issue is in HTTPS certs. Namely, it seems not to find the certificates needed for HTTPS access to Mapbox. I don't know whether they just now switched to HTTPS or not, but I can get Poor Maps GL working by

* download https://raw.githubusercontent.com/ba.../ca-bundle.crt

* in the directory where ca-bundle.crt is stored, run sailfish-qml harbour-poor-maps-gl

Now I wonder, whether it happened when I moved QMapboxGL plugin to libcurl or was anyone able to access Mapbox online maps AFTER updating mapbox-qml plugin to 1.1.0?

The simple example QML that I posted seems still need some additional Silica wrapper. While it nicely downloads all required maps/fonts when started from directory with the certificates (as shown using urlDebug switch), map is not displayed and it complains about the absence of __silica_applicationwindow_instance. So, don't forget to wrap it into some Silica app QMLs.

PS I will look into the certificate problem and resolve it within few days