Was collapsed_connection deprecated due to some technical flaw or incompatibility ? or just from a lack of development ownership ? I understand that collapsed_forwarding attempts to solve the same issue, but collapsed_connection seems to be more forgiving than collapsed_forwarding(at least the open sourced version). Forgiving in the sense that collapsed_connection eventually forwards a request upstream if it cant serve from cache. Whereas collapsed_forwarding issues a 500 error(after exhausting all retries) if the full object is not in cache or at a minimum the first fragment.
https://github.com/apache/trafficserver/tree/master/plugins/experimental/collapsed_connection
