httping through proxy

[naim abu darwish]

hello.
I'm trying to monitor browsing performance through proxies. httping (
http://www.vanheusden.com/httping/ )is  like ping but for
http-requests.
check command example is  something like ::

httping -h www.google.com -x 192.168.20.24:8080 -c 1 -t 2

where the variables are ::
1) 192.168.20.24 is the ip address of the proxy, corresponding to
$$HOSTADDRESS$$
2) 8080  is the port number that the squid proxy is running on, this
could be corresponding to $ARG1$

Could anyone please tell me how to put this in a way nagios
understands. Its something close to what i did below, but i cant quiet
 figure it out yet.
the mistake is somewhere with the colon ( : ), i think.

###  from the file   /etc/nagios/checkcommands.cfg


define command{
        command_name    check_httping
        command_line       /usr/bin/httping -x $HOSTADDRESS$ : $ARG1$
-c 1 -h  www.google.com
        }
###
Many thanks


-Naim

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