ftp.ntua.gr:/ubuntu/dists/groovy-security/universe/debian-installer/binary-amd64/by-hash/SHA256/?C=N&O=A 
Icon  Name                                             Last modified      Size  Description
[DIR] Parent Directory                                                      -   
[   ] 481be842aa71e71dafb0734338ead097dd1c9022fb6af..> 13-Apr-2021 18:14  4.7K  
[   ] ef25f4d0b6e77ebd7b36999f93cecb48bb7132123571c..> 13-Apr-2021 18:14  4.8K
Apache/2.2 Server at ftp.ntua.gr Port 80