WWW and HTTP WWW and HTTP * The Hypertext Transfer Protocol (HTTP) is the main protocol used to access data on the World Wide Web (WWW). * The World Wide Web is a repository of information spread all over the world and linked together. * Hypertext and hypermedia are documents linked to one another through the con-cept of pointers. * Browsers interpret and display a Web document. * A browser consists of a controller, client programs, and interpreters. * A Web document can be classified as static, dynamic, or active. * A static document is one in which the contents are fixed and stored in a server. The client can make no changes in the server document. * Hypertext Markup Language (HTML) is a language used to create static Web pages. * Any browser can read formatting instructions (tags) embedded in an HTML document. * A dynamic Web document is created by a server only at a browser request. * The Common Gateway Interface (CGI) is a standard for creating and handling dynamic Web documents. * A CGI program with its embedded CGI interface tags can be written in a language such as C, C++, shell script, or Perl. * The server sends the output of the CGI program to the browser. * The output of a CGI program can be text, graphics, binary data, status codes, instructions, or an address of a file. * An active document is a copy of a program retrieved by the client and run at the client site. * Java is a combination of a high-level programming language, a run-time environment, and a class library that allows a programmer to write an active document and a browser to run it. * Java is used to created applets (small application programs). * Java is an object-oriented typed language with a rich library of classes. |
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