Feature request: replace expired bids that are about to be rendered

[dgirardi]

Currently, rendering of expired bids can be suppressed with setConfig({auctionOptions: {suppressExpiredRender: true}}), and will trigger the expiredRender event. Using those, a publisher could for example refresh the slot instead of rendering an expired bid.

However this is not enough for out of page slots (such as interstitials) because GPT won't allow refreshing or redefining them. Once the slot has been set up for a particular ad there is AFAIK no way to change it.

Prebid should provide a way to say "when an expired bid is being rendered, render this other bid instead". It could for example look like:

pbjs.setConfig({
    refreshExpiredBid(expiredBid) {
          // return a promise to some other bid
    }
})

Related: #13807

[patmmccann]

we clarified with the gam team that we can't change the targeting once display has been called, so the pub may set a targeting variable for hb_bidder that would end not being true at time of render, potentially causing accounting issues for them if they use gam for reconciliation. hence, we would always need this feature to be opt in.

[patmmccann]

tagging pmc-review to get a priority

[lcorrigall]

PMC: it's an interesting idea. This doesn't introduce any new problems, and would behave similar to bid caching. However, we aren't sure who really needs this. Would be good to gets some feedback on who wants this and how often they see expired interstitials.
Also, feedback for buyers, they should increase exp/ttl on interstitial bids.