CORS Error When Loading OPNVKarte Basemap

[arjxn-py]

When attempting to load the OPNVKarte basemap in JupyterGIS, a CORS (Cross-Origin Resource Sharing) error is encountered, preventing the tiles from being fetched and displayed.

Access to fetch at 'https://tileserver.memomaps.de/tilegen/4/11/7.png' from origin 'http://localhost:8888' 
has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.

GET https://tileserver.memomaps.de/tilegen/4/11/7.png net::ERR_FAILED 200 (OK)

[arjxn-py]

Apologies in advance as I know that the project is WIP but one more reason to open this issue is that I'm facing the same problem in arjxn-py/jupytergis#1, see this commit in which i just did a hacky workaround but definitely not for production.

[arjxn-py]

ProxyHandler defined in #104 should come in handy to fix this as well. But since it'd still not work with JupyterLite, would we want to also add a note or warning if we decide to use that upon agreement?

[martinRenou]

I guess that in the case of jupyterlite we can rely on cors-anywhere for now? We could think of making our own deployment of a cors-anywhere-like server

[arjxn-py]

I guess that in the case of jupyterlite we can rely on cors-anywhere for now? We could think of making our own deployment of a cors-anywhere-like server

Oh yes, this sounds promising. I didn't actually thought about serving that ourselves but it's definitely can be explored and I would be up for it.