Add Debian 9 Stretch archive mirror/mirror

Question

How to include the http://ftp.br.debian.org/debian/ in my sources.list of Debian 9 (Stretch)?

I need to include with the contrib non-free also.

I need to explain why as well, because the sources.list Urls (/etc/apt/sources.list) are nothing like the online FTP mirror.

Example:

URL: http://ftp.br.debian.org/debian/dists/stretch/non-free/

sources list. [It’s not right, just an example]: deb-src http://ftp.br.debian.org/stretch stretch main contrib non-free

What is the correct way to include the Brazilian Debian 9 mirror?

Answer 1

I managed to find at this link.

deb http://ftp.br.debian.org/debian stretch main contrib non-free

Which is almost the same as what I had posted in the question, changing only the first word stretch for debian.