SOAP Health Monitor

There is a workaround for this issue where you use a virtual with an iRule attached as your monitor target. So your config would look like:

monitor soap_mon {
   defaults from soap
   dest 10.10.10.99:http 
   method "HealthCheck"
   namespace "http://example.org/"
   param type "string"
   protocol "http"
   return type "string"
   return value "LOOKS GOOD"
   urlpath "/soapmon.cgi"
}
pool my_pool {
   monitor all soap_mon
   member 10.10.10.100:http
}
pool soap_health_check_pool {
   member 10.10.10.100:http
}
virtual soap_health_check {
   destination 10.10.10.99:http
   snat automap
   ip protocol tcp
   profile http tcp
   pool soap_health_check_pool
   rule soap_health_rewrite
}

And use an iRule like:

rule soap_health_rewrite {
   when HTTP_REQUEST {
      HTTP::header replace SOAPAction "Some_SOAP_Action"
   }
}

That's a rough draft that should get you started...