Dear Maintainer,

there are third-party Debian repositories out in the wild that either
allow list certain user agent strings or deny list libwww-perl's user
agent string. Either way, debmirror fails to mirror these repositories.

Changing the user agent to another one, e.g. curl's, resolves this
issue. Please find a patch that resolved this problem for us.

best regards,
Jörg Behrmann