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