ftp.ntua.gr:/ubuntu/dists/groovy-backports/restricted/binary-amd64/by-hash/SHA256/?C=N&O=A 
Icon  Name                                             Last modified      Size  Description
[DIR] Parent Directory                                                      -   
[   ] 074c450341ffd329d85d50cce1383abd2447e5de1b7c0..> 24-Apr-2020 16:55  112   
[   ] 1ecf8ede6a1ae61b641204572f1da419db07863163992..> 24-Apr-2020 16:55   64   
[   ] e7ab72b8f37c7c9c9f6386fb8e3dfa40bf6fe4b678767..> 24-Apr-2020 16:55   40
Apache/2.2 Server at ftp.ntua.gr Port 80