[Nagiosplug-help] Check_http Question

[Vladimir B.]

Hello,

I`m trying to check a specific page on the web for a specific string using
the check_http plugin.
However, in the status information column in Nagios I get (NULL). What is
that mean ? Is the command syntax wrong ?
This is the command I`m using:

$USER1$/check_http -H $HOSTADDRESS$  -u /<Page Url> -s $ARG2$

Thanks.
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