Any one knows how to know the site name from which user click our link.
Like the ads company site, how they know from which site user opened their site.
Like we send the email to many users and when a user clicks on the link how can we know about the site name from which user click our link.
They can check the referrer, which is set by the browser (mostly, it can and will be blank on certain requests).
It was spelt incorrectly in the spec, and the misspelling is here to stay.