Using a monitor with a user-agent string?

This isn't exactly an iControl question, but it seemed relevant. Sorry if this is off-topic.

 

 

We have a web app that expect a user agent string with every request; it considers a missing user agent string to be a bad request and logs an error.

 

 

Our F5 monitors don't supply a user agent string. Is it possible to make it do so, perhaps by using a shell script as an external monitor? Anyone have a sample?