I’m new to Nexus so I’m not sure what you are talking about 
I’ve followed this documentation: Repository Management
The HTTP sections says:
“The HTTP configuration section allows you to configure the necessary details to access the remote repository, even if you have to provide authentication details in order to access it successfully or if you have to connect to it via a proxy server.”
And then I’ve set the authentication using “Username” and filling the username and password.
The APT remote is private and protected by username/password.
The instruction to access to that APT remote is to put the username/password on auth.conf but of course that doesn’t apply on Nexus.
So, how I should configure an APT proxy on which the remote requires APT authentication?