The Barracuda load balancer has feature which enables it to recover a broken web connection. Let me explain the scenario; suppose that there exist two web servers behind the Barracuda load balancer and the user is downloading a file from one of the back-end web servers. Now, suppose that the active web server goes down, the Barracuda load balancer is capable of continuing the download from where it was broken using the other web server. Is it possible to achieve such a behaviour using mod_proxy_balancer? Are there exist any open source alternatives which can provide the same capability? If not, is anybody aware of any roadmap to achieve the same functionality using open source tools? Considering mod_proxy_balancer, what are the required steps to follow in order to add such a functionality?