Custom log message when text matches

[Shawn Heisey]

I've been looking around for the answer to this question, but so far 
I've turned up nothing.

Can I have haproxy (currently 1.5-dev3) spit out a custom log message, 
preferably at a custom level, when certain text is found in a request?  
I need to do this because the text I'm looking for will be beyond the 
1024 character cutoff in the normal syslog.

Thanks,
Shawn