Hello,

We observe that, in some cases, the bidding script used to run the Protected Audience auction is much older than the contextual bid request, or the call to the key-value server. Our estimate is that, for between 0.5% and 1% of our records, the bidding script was generated by a call to the bidding URL more than an hour prior to the bid request. In some rare cases, the script is older than a day.

The script is not often changed, but when it is, the older version of the script seems to hang around for quite a while, and this can cause issues for us.

We thought there could be some caching mechanism in action, so we set the CacheControl HTTP header of the response from the bidding URL to “no-store”, which we thought would prevent script caching from happening, but we still observe the phenomenon in the same proportions.

Is this an expected behaviour? Do you have any input or feedback on this?

Thank you.