http://deb.debian.org/debian/dists/stretch/InRelease code example
Example: http://security.debian.org/debian-security/dists/stretch/updates/InRelease
deb http://archive.debian.org/debian/ jessie main
deb-src http://archive.debian.org/debian/ jessie main
deb http://security.debian.org jessie/updates main
deb-src http://security.debian.org jessie/updates main