Get the time immediately before the classMessage started the
TLS handshake.
It will be 0 if no TLS handshake was required to fetch the resource
(connection was not secure, a persistent connection was used or resource was
loaded from the local disk cache).
Get the time immediately before the classMessage started the TLS handshake.
It will be 0 if no TLS handshake was required to fetch the resource (connection was not secure, a persistent connection was used or resource was loaded from the local disk cache).