Why isn't chat using a secure HTTPS URL?
Chat, End-User pages
Chat will use a secure SSL connection as long as end-user SSL is enabled. End-user SSL is enabled by default for Oracle Service Cloud as of version May 2016. If you have upgraded from a prior version where end-user SSL was disabled or if end-user SSL was disabled for any other reason, the chat service will not use a secure connection.
You can request that SSL be enabled for your end-user pages by submitting a service request via Ask Technical Support. Please include the site name and the interface name where end-user SSL should be enabled. For each interface where SSL is enabled, the chat service will use a secure HTTPS URL.
Please note that enabling the end-user SSL feature will affect all end-user pages for the interface where SSL is enabled. SSL cannot be enabled for Chat pages only.