Calculating Latency

you would probably want to log the http request turnaround time in the response event. Like you surmised, if there are more than one connection request within the client session, you'll only get the response time of the last request.

 

 

If you wanted to get really fancy, you could log the timestamps of each request within a session in an array and when the client closed, log the min/max/avg response time. This might not be that helpful without having an idea of content length, but this should give you a start.