Offline download crashes

[m0nac0]

In the flutter bindings we are seeing this crash maplibre/flutter-maplibre-gl#39 when downloading e.g. regions from the source https://demotiles.maplibre.org/style.json in our test/example app.

I suspect it has to do something with the new regex validations introduced here https://github.com/maplibre/maplibre-gl-native/blob/master/src/mbgl/util/mapbox.cpp as part of the migration to Maplibre. But I couldn't find any documentation for offline downloads.

Are there different requirements for source URLs for offline downloads compared to those for regular map displays?

[JanikoNaber]

The download function is a important feature for our App. Is there any update on this issue?

[ntadej]

A self-contained reproducer would help a lot in fixing this faster. Do you think you could prepare it?

[JanikoNaber]

I can only reference to to flutter binding example: https://github.com/m0nac0/flutter-maplibre-gl/tree/main/example
Downloading a region results in a crash, see maplibre/flutter-maplibre-gl#39
But therefore you need flutter to be installed. @m0nac0 can you provide a reproducer without flutter?

[m0nac0]

@m0nac0 can you provide a reproducer without flutter?

Sorry, I probably won't have enough time to try to reproduce this without flutter.

[louwers]

DemoTiles is hosted on GitHub Pages and does not work with offline support. Please use another tile server to try out offline support.

[noorbakerally]

Any success on this issue, is it because of the DemoTiles?

[louwers]

Hello @noorbakerally, I tried out offline support with the demo tiles which failed, while a 'normal' tile server worked. The problem I ran into was that it did not know how to handle a 304 'Not Modified' status code that GitHub Pages gave.

I did not think it was worth investigating further because offline support for demo tiles does not make a lot of sense.

So please try it out with another tile server, and if you run into any issues feel free to create an issue or a Q&A topic on GitHub Discussions.