A report on Web server and Web crawler

PC clients communicating via network with a web server serving static content only.

High-level architecture of a standard Web crawler

The inside and front of a Dell PowerEdge server, a computer designed to be mounted in a rack mount environment. It is often used as a web server.

Evolution of Freshness and Age in a web crawler

Multiple web servers may be used for a high traffic website.

Web server farm with thousands of web servers used for super-high traffic websites.

ADSL modem running an embedded web server serving dynamic web pages used for modem configuration.

First web proposal (1989) evaluated as "vague but exciting..."

The world's first web server, a NeXT Computer workstation with Ethernet, 1990. The case label reads: "This machine is a server. DO NOT POWER IT DOWN!!"

Sun's Cobalt Qube 3 – a computer server appliance (2002, discontinued)

PC clients connected to a web server via Internet

PC clients communicating via network with a web server serving static and dynamic content.

Directory listing dynamically generated by a web server.

Chart:
Market share of all sites for most popular web servers 2005–2021

A user agent, commonly a web browser or web crawler, initiates communication by making a request for a web page or other resource using HTTP, and the server responds with the content of that resource or an error message.

- Web server

As the crawler visits these URLs, by communicating with web servers that respond to those URLs, it identifies all the hyperlinks in the retrieved web pages and adds them to the list of URLs to visit, called the crawl frontier.

- Web crawler

3 related topics with Alpha

Hypertext Transfer Protocol

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Application layer protocol in the Internet protocol suite model for distributed, collaborative, hypermedia information systems.

URL beginning with the HTTP scheme and the WWW domain name label

An HTTP/1.1 request made using telnet. The request message, response header section, and response body are highlighted.

A web browser, for example, may be the client whereas a process, named web server, running on a computer hosting one or more websites may be the server.

Other types of user agent include the indexing software used by search providers (web crawlers), voice browsers, mobile apps, and other software that accesses, consumes, or displays web content.

HTML

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Standard markup language for documents designed to be displayed in a web browser.

Web browsers receive HTML documents from a web server or from local storage and render the documents into multimedia web pages.

The result is still invalid markup, which makes the document less accessible to other browsers and to other user agents that may try to parse the document for search and indexing purposes for example.

Bots are very commonly used on social media. A user may not be aware that they are interacting with a bot.

Internet bot

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Software application that runs automated tasks over the Internet, usually with the intent to emulate human activity on the Internet, such as messaging, on a large scale.

An Internet bot plays the client role in a client–server model whereas the server role is usually played by web servers.

The most extensive use of bots is for web crawling, in which an automated script fetches, analyzes and files information from web servers.