Shulou(Shulou.com)06/03 Report--

A Web server, which generally refers to a "website server", refers to a program that resides on a certain type of computer on the Internet. The Web server can provide documents to clients such as Web browsers, or place website files for the world to browse, and even place data files for the world to download.

Web server, also known as "WWW server" (English full writing: World Wide Web, translated into Chinese: world wide Web or World wide Web), the main function is to "provide online information browsing services". WWW is a multimedia information query tool of Internet (Internet). It is a service developed on Internet (Internet). It is also the fastest growing and most widely used service at present. It is precisely because of the WWW tools that the Internet has flourished rapidly in the past decade, and the number of users has soared. According to the latest data, the world's population has reached 7.676 billion, of which the number of global "Internet users" (Internet users) has reached an astonishing 4.388 billion.

A variety of definitions and interpretations of "Web server":

1. The Web server is a passive program, and the Web server responds only when browsers running on the Internet and on other computers make requests.

2. A server on the Internet, also known as a Web server, is a high-performance computer with an independent IP address on the Internet, which can provide various Internet services such as WWW (World wide Web), Email (email) and FTP (File transfer) to clients on the Internet, including personal desktops, laptops, tablets, etc.

3. Web server refers to a program that resides on a certain type of computer on the Internet. When the Web browser (client) connects to the Web server and requests a file, the Web server processes the request and sends the file back to the Web browser with accompanying information telling the Web browser how to view the file. Because Web servers use HTTP (Hypertext transfer Protocol) to communicate with client browsers, they are often referred to as "HTTP servers".

4. Web server can not only store information, but also run scripts and programs on the basis of providing information to users through Web browser.

Let's talk about "WWW":

WWW is the English abbreviation of "World Wide Web". It can also be abbreviated as Web. The Chinese name is "World wide Web". It originated from the "master-slave distributed hypermedia system" developed by the European Quantum Physics Laboratory CERN (the largest particle physics laboratory in the world) in March 1989. Through the World wide Web, people can get rich information quickly and conveniently as long as they use simple methods. Because users do not need to care about some technical details in the process of accessing information resources through "Web browser", and the user interface is easy to understand, as soon as Web is launched on the Internet, it has been enthusiastically sought after, popular all over the world, and has rapidly been explosive growth.

For a long time, people can only get information through traditional media, such as television, newspapers, magazines and radio. However, with the development of computer technology and the Internet, people's demand for access to information is not only satisfied with the unilateral dissemination and access of traditional media, but also hope to have a subjective selectivity and more interaction. With the popularity of personal computers and the increasing penetration and promotion of the Internet, people's access to information has become very timely, convenient, rapid and fast.

In 1993, the technology of WWW made a breakthrough. It solved the problems of "text display, data connection and image transmission" in remote information services, and made WWW the most popular way of information transmission on the Internet. The Web server has become the largest group of computers on the Internet. The number of Web documents and the wide range of linked networks are amazing.

It can be said that Web has taken a "revolutionary" step for the popularization of Internet applications, and it is the most exciting achievement in the history of Internet development.

At present, the most commonly used Web servers are Apache (Apache) and Microsoft (Microsoft) Internet information servers (full English acronym: Internet Information Services, abbreviation: IIS, that is, "Internet information service").

How the Web server works:

The working principle of Web server is not complicated, and it can be divided into four steps: connection process, request process, reply process and close the connection.

The connection process is a connection established between the Web server and the Web browser. To see if the connection process is implemented, the user can find and open the virtual file socket (an abstraction layer through which applications can send or receive data and perform "open, read, write, and close" operations like files). The establishment of this file means that the step of "connection process" has been successfully established.

The request process is that Web's browser uses the file socket to make various requests to Web's server. The response process is to use the "HTTP protocol" to transfer the request put forward in the request process to the Web server, and then implement the task processing, and then use the "HTTP protocol" to transmit the result of the task processing to the Web browser. At the same time, the above requested interface is displayed on the Web browser.

Closing a connection is the process of disconnecting the Web server and the Web browser when the previous step, the answer process, is complete. The above four steps of Web server are interlinked, closely related, logical, and can support multiple processes, multiple threads, and the technology of mixing multiple processes with multiple threads.

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