ftp.ntua.gr:/debian/dists/stretch-backports/contrib/debian-installer/binary-all/by-hash/SHA256/?C=M&O=A 
Icon  Name                                                                         Last modified      Size  
[DIR] Parent Directory                                                                                  -   
[   ] 0040f94d11d0039505328a90b2ff48968db873e9e7967307631bf40ef5679275             18-Jun-2017 11:11   32   
[   ] 706e107ada1e0fe75a9423c07f5baef52cb89bd1b0c79ce55b6f5ac3e1af91b4             18-Jun-2017 11:28  178   
[   ] f61f27bd17de546264aa58f40f3aafaac7021e0ef69c17f6b1b4cd7664a037ec             19-Jun-2017 23:59   20
Apache/2.2 Server at debian.noc.ntua.gr Port 80