HTTPS (full name: Hyper Text Transfer Protocol over Secure Socket Layer or Hypertext Transfer Protocol Secure, Hypertext Transfer Security Protocol) is an HTTP channel aimed at security. Simply put, it is a secure version of HTTP. That is, an SSL layer is added to HTTP. The security foundation of HTTPS is SSL, so the details of encryption require SSL.
It is a URI scheme (abstract identifier system), and its syntax is similar to the http: system. For secure HTTP data transfer. The https:URL indicates that it uses HTTP, but HTTPS has a different default port than HTTP and an encryption/authentication layer (between HTTP and TCP).
This system was originally developed by Netscape and was built into its browser Netscape Navigator, providing authentication and encrypted communication methods. It is now widely used for security-sensitive communications on the World Wide Web, such as transaction payments.
HTTPS (securely transferring web pages) server, the default port number is 443/tcp 443/udp.
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