If the available impression is on a website, Ad Exchange may include a Site object to describe the website.
A BidRequest can only contain a single Site or App object, not both.
|Field name||Data type||Description||Sent?|
|The list of IAB content categories that apply to the site.||Sometimes|
|The site domain (for example, ||Sometimes|
|An object containing properties that describe custom fields related to this site.||Sometimes|
|The ID for the site associated with this inventory purchase.||Sometimes|
|Indicates whether the site has been programmed to optimize layout when viewed on mobile devices.|
|The URL of the webpage where the impression will display.||Sometimes|
|An object containing properties that describe the publisher of the Site or App for this impression opportunity.||Sometimes|
|The referrer URL that navigated the end-user to the current page.||Sometimes|
For additional details, see: