Comment 16 for bug 1820892

I don't think Rackspace is necessarily directly operating any sort of transparent proxy for https://pypi.python.org/ but that site does rely on a vast network of proxies (a CDN) so it's possible the PyPI CDN endpoints nearest the nodes in rax-dfw (those CDN endpoints might even be hosted inside the provider's network, that's not an uncommon choice for larger CDN operators). Since the code in DevStack accessing the PyPI JSON metadata API isn't parsing the JSON itself to make sure it's complete and is also silencing errors which curl might otherwise emit, and truncated or failed queries could explain the observed behavior, I would start by ruling that out.