Custom cookie to http-request

Hi,
I would like to stream 3D Tiles from AWS with the "Tileset Source" -Option set to "From Url". However my content is private and I use custom cookies in http request header to authenticate request. Is it possible to set custom cookies or somehow customize http requests in Unity/c# side or how can I achieve this?

Br,
TMK

The issue does not name files, tests, or entry points. Start by locating the Unity/C# handling for the Tileset Source set to “From Url” and determine how its HTTP requests are created. Done means establishing whether custom Cookie headers can be supplied and documenting or implementing a supported approach.

Written by the indexing model from the issue text.