Pass cookies (credentials) to private TileServer

Hi,

I have a private TileServer that requires cookies for credentials.
The user did the login and has the cookie in the browser.
I use the TileServer url as custom mapStyles value.
How can it pass also the cookie to my private TileServer?

The issue names no files or tests; start by tracing how custom mapStyles requests reach the private TileServer and how browser credentials are handled. Define and verify the expected behavior: cookies from the logged-in browser should be available to the TileServer request, with appropriate tests for the credentialed request path.

Written by the indexing model from the issue text.