The three core standards of the Web

1. Uniform Resource Locator (URL)

English full name: Uniform Resource Location

Composition: protocol type, host name, path

A common location and identity service/file in the URL:

http: file located on Web server

HTTPS: Hypertext Transfer Protocol delivered using Secure Sockets Layer

File: File name for a specific host

ftp: File located on FTP server

Gopher: File on Gopher server

WAIS: File on WAIS server

News: The file is on the usernet server

Telnet: Connecting to a transmitter device that supports Telnet telnet

mailto: e-mail address

LDAP: Lightweight Directory Access Protocol search

2. Hypertext Transfer Protocol (HTTP)

Characteristics:

C/S mode

Simple and fast. When sending a request, only the method and path of the request must be provided.

Allows the transfer of any type of data object.

No connection. Only one request is processed per connection.

Stateless protocol. There is no memory function for transaction processing. If subsequent processing requires the use of the preceding information, retransmission is required.

　　　　

3. Hypertext Markup Language (HTML)

The three core standards of the Web