haproxy load balance based on Jenkins api -

using haproxy possible load balance based on output of request specific url? use case load balancing between set of jenkins machines , routing next automated job least busy server.

for example can hit url server-1/computer/api/json?pretty&tree=busyexecutors

which gives output like:

{ "busyexecutors" : 5 }

in case have 5 busy executors. id haproxy hit url , assess server least busy , route next job there. sound possible? output , busyexecutors irrelevant here im looking way kind of information jenkins servers , load balance off of info.

i've looked balance url_param , balance uri neither seem im looking for. i've tested balance leastconn , not im looking for.

if im off base here let me know, , if there better way go im ears.

thanks