Dave, > This is currently not possible with HAproxy. It can not alter or check > anything inside the HTTP body currently. You can only access > inside the HTTP header section here.
I don't believe that any load balancer will be able to do this (dangerous statement!). It would require the load balancer to buffer the entire request and search the entire body to determine where it will need to send to request. This kind of approach would fall apart under fairly light load and/or require exceptionally large quantities of RAM. If there are products that can do this, open source or commerical I would be somewhat interested to know about them, I've never needed to do anything like it but it's always useful to have more tools in your tool box. If you can find a tool that does it you'll probably want to deploy it behind haproxy with a simpler URL based ACL to send it to it, that way you won't be unncessarily analysing the full body of every POST. Good luck, -JohnF
