Hi Ali,
________________________________ > Date: Sat, 13 Jul 2013 23:23:08 +0430 > Subject: Question about a feature that is present in Barracuda Load Balancer > From: [email protected] > To: [email protected] > > Hello List, > 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 behavior > using HAProxy? Are there exist any open source alternatives which can > provide the same capability? If not, is anybody aware of any roadmaps > to achieve the same functionality using open source tools? Considering > an open source load balancer like HAProxy, what are the required steps > to follow in order to add such a functionality? > Thanks in advance. With HAProxy the HTTP connection will abort, the client will reconnect and if the client is smart, he will continue to download where the connection was interrupted with byte-ranges. If you mean the client shouldn't actually be involved in this switchover from one backend server to another within a HTTP transaction, then thats another thing. I'm not sure how this is supposed to work (I can imagine this on big static files only) and it sounds like it violates the RFC. It will probably cause more problems then it solves. Anyway, if you would like to request this commercially, I guess contacting Exceliance is a good idea: http://www.exceliance.fr/en/contact Regards, Lukas
