I'd like to be able to us NGINX as the single point of entry and send the traffic off to different servers depending on the content of a SOAP/XML element, is that possible?

So the SOAP request might POST <colour> BLUE </colour> and it would reverse proxy to server 1 but if it was <colour> RED</colour> it would send it to server 2. I know you can do it with GET requests ($arg) but it has to be POST.

Is that possible? Any links for me?

Thanks!