Introduction Web Technologies

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Particularly the Internet, have become an important part of the business world over the past few years. People have become accustomed to searching the Internet for data, sending e-mails, or making simple purchases electronically. Web browsers, such as Microsoft’s Internet Explorer, or Netscape’s Navigator, played an important part in the rapid webdevelopment of the Internet.

Designed to present a simple and easy-to-operate front-end interface to the user, Web browsers are today’s standard way of accessing the vast amount of information available through the Internet. More recently, with more and more people being connected and the steadily increasing connection speed to the Internet, a new wave of more sophisticated web applications emerged. In order to make these applications possible, the browser’s original functionality of “browsing”, i.e. navigating through the contents of web sites via hyperlinks, needed to be extended significantly. Scripting languages, such as VBScript or JavaScript, Java-enabled browsers, DHTML, or XML are some of the technologies that are part of today’s browsers to provide the means for the development of real-world applications such as on-line bookstores, on-line travel agencies, or banking services, which are some of the most well-known examples for modern Web usage.

 The technologies mentioned above served to enhance the mostly “static” contents (e.g. text or images) of Web pages with “dynamic” elements, such as event handling for error checking of forms prior to submittal, or performing of calculations. But not only browsers needed to be improved. More importantly, Web servers needed to be able to respond to client requests in a more flexible way than presenting the same content to all users. Server-side programming is the key technology that allows developers to make Web applications fit for a specific purpose, so incoming requests can be processed by the server on the fly (e.g. presenting filtered information of a database according to search criteria provided by the client). Server-side programming is today’s way of choice to develop Web applications. A Web server can be completely controlled by the application provider, eliminating uncertainties regarding the capabilities of the client’s Web browser. With server-side programming, Web pages are prepared by the application considering the client’s request. This preparation happens on the server, so that the information submitted to the client can be in HTML format, the Internet’s basic, standardized language of communication.

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