Hi, The Debian mirrors redirector, http.debian.net, is now hosted on debian.org infrastructure under the name of httpredir.debian.org. The service allows many of the nearly 400 Debian mirrors to be made available via a single address, adapting to your network location, IP family connectivity, and service availability. [...]

Your Debian jessie one-liner:

deb http://httpredir.debian.org/debian jessie main