PoolDown problem, no connection on HTTP?

[pingulino]

I'm setting up inbound load-balancing, one pfsense and 2 webservers (both OpenSuse).
webb1 = normal, webb2 = PoolDown.
I'm using 4 ports (441-444) so I have set up one Pool & one PoolDown for each port.
It works fine as long as "Monitor" is set to ICMP - I shut down webb1 and traffic immediately goes to webb2.
However, changing "Monitor" to HTTP redirecting does not happen.
In the logs and in Status->Load Balancing webb1 shows as down on all ports, but as said, the only active PoolDown server is the ones I've set to Monitor ICMP.

Reading the logs, problem seems to be that pfSense doesn't get any connection to port 80 at all - the port is open, I can connect from outside to port80 on both webbservers.
Snippet from System Logs -> System:

3 lines for each webserver, HTTP monitored  (Muliplied 3 times of course): 
relayd[47139]: host 172.16.4.2, check http code (9ms), state unknown -> down, availability 0.00%
relayd[47139]: host 172.16.4.102, check http code (9ms), state unknown -> down, availability 0.00%
And the 4:th line, for working PoolDown-server:
relayd[47139]: host 172.16.4.2, check icmp (0ms), state unknown -> up, availability 100.00%
relayd[47139]: host 172.16.4.102, check icmp (0ms), state unknown -> up, availability 100.00%

As it's a webserver I do want to monitor http.
Also, this is a testing scenario I've set up in VirtualBox.
(Not sure under which category to post, feel free to move it elsewhere.)

[pingulino]

Changing Monitor to TCP works fine.
Maybe I can use that - only need to be sure then exactly what is monitored as "Generic TCP" isn't a very clear expression.

[jimp]

When you have it set to TCP it just tries to connect to the port, it doesn't check that a response is proper, only that a connection can be established.