HTTPS
Hypertext Transfer Protocol Secure (HTTPS) is an extension of the Hypertext Transfer Protocol (HTTP) for secure communication over a computer network, and is widely used on the Internet. In HTTPS, the communication protocol is encrypted using Transport Layer Security (TLS), or, formerly, its predecessor, Secure Sockets Layer (SSL). The protocol is therefore also often referred to as HTTP over TLS, or HTTP over SSL.
OK
In HTTP, the HyperText Transfer Protocol, upon which the World Wide Web is based, a successful response from the server is defined as "OK" (with the numerical code 200 as specified in RFC 2616). The Session Initiation Protocol also defines a response, "200 OK", which conveys success for most requests (RFC 3261).