Server receiving hit from this IP Address `::ffff:127.0.0.1`. Why is that and how to resolve this?

I have a MEAN Stack application deployed on a server and I am using Nginx as proxy server to handle the request and redirect to application's particular port.

I wrote a short script in node.js which fetches IP and location of the users visiting my website. I can see the searched queries and usage of my API from external users and are same as those I can see via Google Analytics.

But I am also getting a strange hit to my server (and API links) from the IP address ::ffff:127.0.0.1. Why is that? Is that because of Nginx? How can I resolve this? Is this even an actual user or what?

via Dynamic Remo