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The World Wide Web (WWW) is a repository of information linked together from points all over the world. The WWW has a unique combination of flexibility, portability, and user-friendly features that distinguish it from other services provided by the Internet. The WWW project was initiated by CERN (European Laboratory for Particle Physics) to create a system to handle distributed resources necessary for scientific research. In this chapter we first discuss issues related to the Web. We then discuss a protocol, HTTP, that is used to retrieve information from the Web.` | Chapter 22 Upon completion you will be able to: World Wide Web: HTTP Understand the components of a browser and a server Understand the function of the URL and cookies Understand how HTML is related to static documents Understand how CGI is related to dynamic documents Understand how Java is related to active documents Know how HTTP accesses data on the WWW Objectives TCP/IP Protocol Suite 22.1 ARCHITECTURE The WWW is a distributed client-server service, in which a client using a browser can access a service using a server. The service provided is distributed over many locations called sites. The topics discussed in this section include: Client (Browser) Server Uniform Resource Locator (URL) Cookies TCP/IP Protocol Suite Figure 22.1 Architecture of WWW TCP/IP Protocol Suite Figure 22.2 Browser TCP/IP Protocol Suite Figure 22.3 URL TCP/IP Protocol Suite 22.2 WEB DOCUMENTS The documents in the WWW can be grouped into three broad categories: static, dynamic, and . | Chapter 22 Upon completion you will be able to: World Wide Web: HTTP Understand the components of a browser and a server Understand the function of the URL and cookies Understand how HTML is related to static documents Understand how CGI is related to dynamic documents Understand how Java is related to active documents Know how HTTP accesses data on the WWW Objectives TCP/IP Protocol Suite 22.1 ARCHITECTURE The WWW is a distributed client-server service, in which a client using a browser can access a service using a server. The service provided is distributed over many locations called sites. The topics discussed in this section include: Client (Browser) Server Uniform Resource Locator (URL) Cookies TCP/IP Protocol Suite Figure 22.1 Architecture of WWW TCP/IP Protocol Suite Figure 22.2 Browser TCP/IP Protocol Suite Figure 22.3 URL TCP/IP Protocol Suite 22.2 WEB DOCUMENTS The documents in the WWW can be grouped into three broad categories: static, dynamic, and active. The category is based on the time the contents of the document are determined. The topics discussed in this section include: Static Documents Dynamic Documents Active Documents TCP/IP Protocol Suite Figure 22.4 Static document TCP/IP Protocol Suite Figure 22.5 Boldface tags TCP/IP Protocol Suite Figure 22.6 Effect of boldface tags TCP/IP Protocol Suite Figure 22.7 Beginning and ending tags TCP/IP Protocol Suite Figure 22.8 Dynamic document using CGI TCP/IP Protocol Suite Figure 22.9 Dynamic document using server-site script TCP/IP Protocol Suite Dynamic documents are sometimes referred to as server-site dynamic documents. Note: TCP/IP Protocol Suite Figure 22.10 Active document using Java applet TCP/IP Protocol Suite Figure 22.11 Active document using client-site script TCP/IP Protocol Suite Active documents are sometimes referred to as client-site dynamic documents. Note: TCP/IP Protocol Suite 22.3 HTTP The Hypertext Transfer Protocol .
