Custom Referrer Not Showing in Analytics

Hi, I am trying to visit xyz.com with a custom referrer using python-dryscrape but it isn't working for google analytics. I mean every other analytics - piwik, clicky, server stats all of them show the referrer I am sending but google analytics shows it as direct.

Any of you who have already done this enlighten me please... If there's any python freelancers who have understood can also ping me.