ftp.ntua.gr:/mirror/ubuntu/dists/groovy/universe/debian-installer/binary-amd64/by-hash/SHA256/?C=M&O=A 
Icon  Name                                             Last modified      Size  Description
[DIR] Parent Directory                                                      -   
[   ] 3388440c309bc5d206d23aacfc90e4ed8acd83d1ad324..> 22-Oct-2020 16:30   78K  
[   ] c00ede85f7f280bddd79e8366b4cfe9c572871adba192..> 22-Oct-2020 16:30   94K
Apache/2.2 Server at ftp.grnet.gr Port 80