Recently I submitted my App to App Store for review and get a rejection which says my App is loading forever:
Guideline 2.1 - Performance - App Completeness
We discovered one or more bugs in your app when reviewed on iPhone and iPad running iOS 12 on Wi-Fi.
Specifically, the activity indicator spun indefinitely on launch, then no further action was generated at the time of review.
Next Steps
To resolve this issue, please run your app on a device to identify any issues, then revise and resubmit your app for review.
If we misunderstood the intended behavior of your app, please reply to this message in Resolution Center to provide information on how these features were intended to work.
For new apps, uninstall all previous versions of your app from a device, then install and follow the steps to reproduce the issue. For updates, install the new version as an update to the previous version, then follow the steps to reproduce the issue.
Resources
For information about testing your app and preparing it for review, please see Technical Note TN2431: App Testing Guide.
For a networking overview, please review About Networking. For a more specific overview of App Review’s IPv6 requirements, please review the IPv6 and App Review discussion on the Apple Developer Forum.
Please see attached screenshot for details.
Before I submit for review, I have tested it on simulators and real devices, both takes 5-10 seconds to open.
I am using Firebase and Ionic, can someone give me some suggestions, what caused this issue? I google searched that Firebase supports IPv6 and now I have no clue why the issue occurred.
There's no hardcoded IP in the source, the only URL I am using is querying rates from Canada Post by url: 'https://ct.soa-gw.canadapost.ca/rs/ship/price'
Any help is appreciated.