Internet Archive's Save Page Now functionality seems to have some logic to return a previous snapshot if it has one that is 5 minutes or so old. The time of the snapshot is made available in the X-Archive-Orig-Date header. It ought to be possible to parse this and compare it against the current time to see if the snapshot was current.
I'm not quite sure what to do if it isn't though...I guess it could at least be logged? Alternatively it could decide not to tweet it so that this doesn't happen. Notice how the new version doesn't have the new change?
Internet Archive's Save Page Now functionality seems to have some logic to return a previous snapshot if it has one that is 5 minutes or so old. The time of the snapshot is made available in the X-Archive-Orig-Date header. It ought to be possible to parse this and compare it against the current time to see if the snapshot was current.
I'm not quite sure what to do if it isn't though...I guess it could at least be logged? Alternatively it could decide not to tweet it so that this doesn't happen. Notice how the new version doesn't have the new change?