How does the User-Agent work?

I'm a bit concerned of the maintenance requirements here. Does the affect the wheel builds?

I agree, this add a burden we did not have previously

How does the User-Agent work?

I copied the code from scipy. Anaconda.org tries to minimally prevent mass scraping of its site by robots. The older urllib library downloads the artifact and identifies as one of the blocked "robots". Adding a User-Agent means urllib pretends to be a web browser instead. This behaviour is built into urllib3 and wget.

I'm a bit concerned of the maintenance requirements here. Does the affect the wheel builds?

No, the wheel builds use this file to download openblas. The cost will come when we update openblas: we will have to regenerate the hashes. Ideally we would output the hashes as part of the MacPython/openblas-libs build processes

Thanks Matti. I confess that I didn't see a problem with urllib3, it seems widely used.