After buying 5 different sites, I noticed that only 1 of them given document.referrer.
On the other referrer is empty.
Checked whether there is an intermediate domain between the advertising and the advertiser was not.
The advertiser's website http and is hosted on https in all five cases.
Do I have to switch to https, that began to seem a referrer in 4 of 5 cases?
And why only one of them passes the referrer with no problems?
And I noticed that on the website where the referrer is sent without a problem, there is a meta tag in the header, which the others do not:
Advertiser's website: dreamcity.uz
Sites with banners: daryo.uz
- Hence the referrer is passedkun.uzgazeta.uzuff.uzolx.uz