How to monitor complex websites?

[Richard Luys-Nagios User]

Ladies and Gents,

I have to monitor a website that is more complex than check_http can  
handle. Please advise.

1.
The website we need to monitor contains a MDM application for a product  
search. This is dynamic and browser-restricted content. The User-Agent  
string of the browser is checked and if not correct you will be redirected  
to a static error page, instead of the search form which is dynamically  
generated (with some fields filled in with defaults).

2.
This website runs on a cluster consisting of 5 nodes. Users connect to  
these nodes based on a round-robbing principle. When a node goes down it  
is possible that they get a error-message telling them the server is  
unavailable. When this happens the node-number of the node that is  
misbehaving can be found in a cookie. So what we like to have is the  
following:
- check the website
- if it gives an error read the nodenumber from the cookie
- Create a CRITICAL for the website with the node-number in the output

We need to monitor this website, but check_http cannot (afaik) send a  
specified User-Agent string. Is anybody aware of another solution, or  
should I create one? If the latter: I was thinking about creating a check  
based on wget, since wget is able to send User-Agent strings and can do  
something with cookies as well. Can someone with enough knowledge on this  
matter tell me if this is doable, or should I walk another path?

Please advise, any suggestions are welcome!

Regards,
Richard Luys
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