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Chapter: Web or internet Programming : Basic Network and Web Concepts

CGI(Common Gateway Interface)

"CGI" stands for "Common Gateway Interface." CGI is one method by which a web server can obtain data from (or send data to) databases, documents, and other programs, and presents that data to viewers via the web.

CGI(Common Gateway Interface)

 

 

       "CGI" stands for "Common Gateway Interface." CGI is one method by which a web server can obtain data from (or send data to) databases, documents, and other programs, and presents that data to viewers via the web. More simply, a CGI is a program intended to be run on the web. A CGI program can be written in any programming language, but Perl is one of the most popular languages

 

       CGI is a standard for interfacing external applications with information servers, such as HTTP or Web servers

 

       This interface provides a means for browsers and the server where document resides to communicate and pass information back and forth

 

       Primarily, this is done through the <FORM> tag, but there can be other ways to use CGI effectively, like through Server Side Includes (SSI)

 

       CGI, permits interactivity between a client and a host operating system through the World Wide Web via the Hyper Text Transfer Protocol (HTTP)

 

       CGI program can be written in C or C++, Perl, ASP, PHP, Python, TCL, shells, and many others languages and scripts


 

Examples of uses for CGI:

       Forms

 

forms on web sites allow the user to enter information which is processed by CGI and mailed to an administrator or logged

On-the-Fly Pages web pages can be created dynamically (as needed) with up-to-date nformation.

 

 

       Database Interaction

 

an application of on-the-fly page creation. Web pages can be created using information read from a database, or a web site form can allow a user to update database entries

       Logging / Counters

 

a log file can record traffic data updated with information on each visitor. A counter can be included on the web page to advertise traffic.

       Animation

 

"server-push" programs can be used to feed the client successive images in an animated sequence.

       Catalogs, Search engines

 

CGI programs

       Obtaining input from a user or from a data file.

       Storing that input in program variables.

       Manipulating those variables to achieve some desired purpose, and

       Sending the results to a file or video display.

 

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