[Dylan16807]

What you describe does not sound like bfcache behavior. Bfcache should make it like you never clicked the link, and create no requests. Did you test this? Is something broken?

Separately, do browsers currently return expired data to AJAX calls? Which ones?

[mixonic]

As mentioned in response to the other comment here, I was in error to use the term "bfcache". Yes, servers cache AJAX calls, this is described under the section "In practice" and there is a link to a server that can you use to replicate the behavior locally, probably in Chrome.