JSESSIONID's with null or empty values

Interesting. Nice work in figuring this out. So the cookie value isn't null, but it's "close" to it üôÇ

Can you try this:

when HTTP_REQUEST {

    Check if the JSESSIONID cookie is present in the request and has a non-null value
   if { [HTTP::cookie "JSESSIONID"] ne "" }{

       Persist on the JSESSIONID cookie value for X seconds
      persist uie [HTTP::cookie "JSESSIONID"] 2700

   } else {

       Cookie wasn't set or didn't have a value, so check for the session ID in the URI
      set jsess [findstr [HTTP::uri] "JSESSIONID" 11 ";"]
      if { $jsess != "" } {
          Persist on the JSESSIONID URI value for X seconds
         persist uie $jsess 2700
      }
   }
}
when HTTP_RESPONSE {

    Check if the JSESSIONID cookie is present in the response and has a non-null value
   if { [string map {\" ""} [HTTP::cookie "JSESSIONID"]] ne "" }{

       Persist on the JSESSIONID cookie value for X seconds
      persist add uie [HTTP::cookie "JSESSIONID"] 2700
   }
}

I don't have an easy way to test this at the moment, but I think that should work to strip out any actual double quotes from the cookie value in responses before checking it.

Aaron