I think this is b/c almost all ad tags are loaded via HTTP.
The browser won't hand over the refer(r)er information from HTTPS to HTTP!
This lack of information causes a lower valuation of the inventory b/c the third-party ad networks (which are determined via AdX by an auction) don't know what they are bidding for.
I'm not exactly sure about the precise causation but I think this is the reason for that drop.
The browser won't hand over the refer(r)er information from HTTPS to HTTP!
This lack of information causes a lower valuation of the inventory b/c the third-party ad networks (which are determined via AdX by an auction) don't know what they are bidding for.
I'm not exactly sure about the precise causation but I think this is the reason for that drop.