nginx does not receive requests except for hard refresh

问题

When doing a tail -f /var/log/nginx/access.log I notice the following things:

when a user is on any page, and hits Enter from the address bar, no request is received by nginx, the browser directly loads from its cache instead
when a user performs a hard refresh (F5 on Windows, Cmd+R on Mac), nginx did receive a request
when a user visits /login which then redirects to /, nginx does indeed receive the request for /login but not for /, so the browser renders / from its cache, ignoring the fact that the user has been logged in since

Put it simply, the browsers doesn't send any request at all for already visited pages, except for hard refreshes performed by the user.

How could I make sure nginx receives all requests, since pages are dynamically generated and, for instance, home page content changes depending on the state of the user?

Using nginx 1.9.3 on digital ocean's Ubuntu 15.10 x64 with http