I am trying to use the dynamic backend selection feature of 1.5, but I am missing something. Here is a snippet of my configuration:
frontend sledgehammer
bind *:10000
option http-pretend-keepalive
default_backend other
capture request header X-Backend len 15
use_backend %hr
This was my interpretation of using the log-format as the backend name.
Can someone give me a little more info on this feature?

