Asynchronously performs a TLS handshake on this.
See handshake for more information.
| this | |
| io_priority |
the [I/O priority](iface.AsyncResult.html#io-priority) of the request |
| cancellable |
a Cancellable, or null |
| callback |
callback to call when the handshake is complete |
| user_data |
the data to pass to the callback function |