Get the time immediately before the classMessage started to
establish the connection to the server.
It will be 0 if no network connection was required to fetch the resource (a
persistent connection was used or resource was loaded from the local disk
cache).
Get the time immediately before the classMessage started to establish the connection to the server.
It will be 0 if no network connection was required to fetch the resource (a persistent connection was used or resource was loaded from the local disk cache).