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n the heart of Rome near the river Tiber lies the Roman Forum Two thousand years ago, the Forum Romanum was the center of power in the Roman world It was the place where triumphal marches took place, where ordinary goods and services were exchanged, and where news and opinions were freely shared (from which we get the common meaning of the word forum ) Though partly built of stone, bricks, and mortar, its expansion was made possible by a new technology: concrete Today, the Internet is the global electronic marketplace The Internet is becoming the dominant center for the exchange of goods, services, and information, both for business enterprises and individual consumers Like the Roman Forum, the growth of the Internet is made possible by advances in technology new computer languages, wide acceptance of networking standards, and inexpensive hardware This book is about JavaServer Pages, an enabling technology that brings together Web browsers, Web servers, and database systems to make applications that are easy to develop, access, and deploy Java technology has proven to be unsurpassed in connectivity, reliability, scalability, and security This technology, more than any other, promises to drive the network computing model, and with it, the global electronic marketplace No one can predict future trends with certainty Even the Forum Romanum was eventually covered with grass and became il Campo Vaccino the field of cows But it is safe to say that the degree to which an enterprise can successfully exchange products, services, information, and ideas will continue to depend on the degree to which it has access to the marketplace
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ne of the most remarkable things about the World Wide Web is it wasn t originally conceived as an application environment Yet today, Web applications are the mainstay of most Internet use in particular, of e-commerce use This chapter briefly traces the origins of the World Wide Web, Web applications, and associated technologies, setting the context for more detailed technical exploration in the remainder of the book
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Birth of the Web
The World Wide Web and its associated Hypertext Transfer Protocol (HTTP) grew out of work done at the European Laboratory for Particle Physics (CERN) in 1990 Tim Berners-Lee developed HTTP as a networking protocol for distributing documents and wrote the first Web browser The system was used at CERN and other high-energy physics laboratories and universities in 1991 and 1992, and grew steadily in popularity In 1993, the advent of the Mosaic browser led to the explosion of commercial Web use In five years, more than 650,000 Web servers were in use worldwide, with uncounted millions of users
Growth of the Web Programming Model
The idea of using the Web as an application environment developed over time, with each stage of technology serving as a springboard for new ideas The first operational model had the Web server simply serving up documents on request In this environment, the content doesn t change unless a human author supplies a new version of a document The client/server interaction is illustrated in Figure 2-1
Figure 2-1
Static document server model
2:
Evolution of the Web Application
THE WEB PROGRAMMING ENVIRONMENT
HTTP is a simple request/response protocol in which a Web browser asks for a document (typically using a GET command), and the Web server returns the document in the form of an HTML data stream preceded by a few descriptive headers 3 examines HTTP in greater detail What quickly became apparent is if humans could revise the documents handled by the Web server, so could a text-processing program like a Perl script The Web browser is unaware of the difference because the result of an HTTP request is still an HTML data stream What s more, the browser can send more than just a request it can send parameters, either by embedding them in the URL or by sending a data stream with the request This suggests an HTTP request can be interpreted as a database query and the query results can be used to build an HTML document dynamically With the development of the NCSA HTTPd Web Server came a new specification designated the Common Gateway Interface (CGI) A CGI program is invoked by the Web server in response to certain types of requests, usually requests for documents in a particular directory or filenames having a particular extension, such as cgi The request parameters are passed as key/value pairs, and the request headers as environment variables The program reads these parameters and headers, performs the application task at hand (typically accessing a database to do so), and then generates an HTTP response The response is sent back to the requesting Web browser as if it were an ordinary static document Figure 2-2 illustrates the process flow
Figure 2-2
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