iOS development----Network parts----The difference between HTTPS and HTTP

First, the HTTPS protocol requires a certificate to the CA, the general free certificate is very small and requires a fee.
Second, HTTP is a Hypertext Transfer Protocol, the information is plaintext transmission, HTTPS is a secure SSL encryption Transfer protocol.
Third, HTTP and HTTPS use a completely different way of connection, with the same port, the former is 80, the latter is 443.
Four, HTTP connection is very simple, is stateless; The HTTPS protocol is a network protocol built by the SSL+HTTP protocol to encrypt the transmission and authentication, which is more secure than the HTTP protocol.

iOS development----Network parts----The difference between HTTPS and HTTP