'HAProxy log presence of cookies in the response

I'm trying to better understand the applications behind my HAProxy, and I would love to include two things in the logs (in order of importance):

  • whether there were any cookies present in the response
  • what the name (and ideally length) of each cookie is

HAProxy logging configuration seems a bit inflexible for this sort of thing. So far I've figured out how to:

  • log the value of a specific cookie I've named
  • log the first x characters of the last "Set-Cookie" header in the response

The former doesn't help me at all. The latter seems better than nothing, but isn't quite what I want. What I really want is some sort of "has cookies" = true/false and then the list of cookies with lengths. Is this at all possible with HAProxy?

cookieshaproxy


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