Writers of client software should make sure make that any actions taken by their software are safe and otherwise idempotent. The actual user of the software should be completely aware of any actions that may be taken by the software they are running. Abuse of Server Log Information.
Servers are in the position to collect data about the information requested by clients.
This information is considered confidential in nature and may be prohibited by law. Server providers should make sure that logging information is not distributed. This insecure transport can include credit card numbers, private or secret details, etc. How to set up access to WWW from behind security firewalls. None of them is yet the universal solution to the secure data transmission problem, and to use each of them you need the right combination of a WWW-Browser and a server.