Per repology:
"Homepage link
"https://github.com/gisle/libwww-perl/tree/File-Listing/master" is dead
(HTTP error 404) for more than a month."
The first part of the URL is valid, up to
"https://github.com/gisle/libwww-perl/".
I suggest updating the repository value to that URL.
Regards,
John
https://rt.cpan.org/Ticket/Display.html?id=122710