Validating my feed, it has an enclosure with a URL of
https://archive.org/download/NigelFarageAPersonalMessageToNorthernIrelandVoters./Nigel%20Farage,%20a%20personal%20m
And if you don't have httpS then your SSL says your page isn't secure. #feedvalidator step up. There are a ton of feedback/complaints about this on the support forum here https://groups.google.com/forum/#!forum/feedvalidator-users
More specifically here: https://github.com/rubys/feedvalidator/issues/16
The problem seems to be that it’s a HTTPS URL instead of a HTTP URL.
The linked error documentation, foo attribute of bar must be a full URL, says:
If this is a link to a web page, you must include the "
http://
" at the beginning and immediately follow it with a valid domain name.
The RSS 2.0 spec says about <enclosure>:
The url must be an http url.
If you change https://archive.org/download/…
to http://archive.org/download/…
, it validates.