The https option appears to be disabled for cordova and electron builds, commenting out ‘cfg.devServer.https = false’ in <project>/node_modules/quasar-cli/lib/quasar-config.js eveything works: if (this.ctx.mode.cordova || this.ctx.mode.electron) { // cfg.devServer.https = false cfg.devServer.open = false cfg.devServer.compress = false }