Ping requests

Optionally, ping requests can be periodically sent to Woopra servers to refresh the visitor timeout counter for the session/visit. This is used if it’s important to keep a visitor status ‘online’ when she’s inactive for a long time (for cases such as watching a long video). The javascript SDK will automatically start sending pings after the first event is sent.

http://www.woopra.com/track/ping
  ?host=mywebsite.com
  &cookie=AH47DHS5SF182DIQZJD
  &timeout=300000

There is no need to have custom parameters in the ping request.
It is recommend to send ping requests at intervals slightly less than the timeout value. If the timeout is 60 seconds, consider pinging the servers every 55 seconds, otherwise you will be sending unnecessary requests.