title: pip install keep asking user and password
body: <p>I am new to PyPI hosting on private, so I hosted private PyPI repo on Nexus3 with python 2.7, I put the following in pip.conf: </p>
  
  <pre><code>[global]
  extra-index-url = https://username:password@example.com/repository/package/simple
  </code></pre>
  
  <p>However, it keeps pops up to ask the user and password. Since I pass the username and password already in URL, should it just pass without aksing? Anyone have the same case and how do you solve it?</p>