• Pip version: 9.0.1
• Python version: 3.6
• Operating system: Linux

Description:

I have this in my pip.conf:

[global]
index-url = https://myregistry-xyz.com
extra-index-url = https://pypi.python.org/pypi

Let's assume packageX exists in both registries and I run pip install packageX.

I expect pip to install packageX from https://myregistry-xyz.com, but pip will use https://pypi.python.org/pypi instead.

If I switch the values for index-url and extra-index-url I get the same result. pypi is always prioritized.