By Stefano Ceri; et al
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The chapter closes with a discussion of the next challenge of Web applications: the publishing of content for multiple devices with different rendition capabilities. 2 HTTP and HTML: The Foundation of Web Technology We start the technology tour from the foundations, which lie in the HTTP protocol and in the HTML markup language. 1 Accessing Remote Resources: The Hypertext Transfer Protocol The fundamental technology at the origin of Web applications is the well-known HyperText Transfer Protocol (HTTP), an application-level protocol for allowing users to make requests of resources to remote servers.
Some important observations apply to HTTP, which are at the base of the evolution of Web application architectures: HTTP is stateless: Each HTTP request is treated by the Web server as an atomic and independent call. There is no difference between a sequence of two requests by different users or by the same user. As a consequence, HTTP is not capable of maintaining any information between two 2In the HTTP terminology, the word “entity” refers to the content transferred in the body of an HTTP request or response, which can be, for example, the HTML page returned to the browser, and the text submitted by the user in a form.
A long text or a file) to be processed by the server. In such a case, the user’s input is packaged as an attachment to the request, and constitutes the so-called request body. For example, in order to display an HTML copy of the article “As You May Think,” by Vannevar Bush published by the Atlantic Monthly, the browser may send the following GET request to the Web server installed in the host www. 1 The request includes the name of the method (GET), the URL of the requested resource, and the version of the HTTP protocol.