How Common Gateway Interface Works

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What is Common Gateway Interface (CGI)

Common Gateway Interface is defined as a program that interacts with an HTTP (hypertext transfer protocol) server which serves as a bridge between information sources, external database, and World Wide Web servers. It is very important as it collects various feedbacks to the user via the HTML form.

In a common gateway interface, a special program is used which is called common gateway interface program which is a computer program that is defined by a World Wide Web server. It is started through the hypertext transfer protocol request.

The main uses of the common gateway interface program are that it is used to carry a hypertext markup language form.

Working Principle of Common Gateway Interface (CGI)

First of all, the user opens an URL to start a hypertext transfer protocol request and the gateway program in the URL is activated. This is all determined by a World Wide Web server to send maximum numbers of parameters via common gateway interface program.

After that, the information is processed by the gateway interface program for returning it to the hypertext markup language file. This hypertext markup language file is returned to the World Wide Web server. Finally, the web server shows the information received. All this information is transmitted by a web browser to a common gateway interface program by two commands. They are GET command and POST command.

What Is Practical Extraction Report Language (PERL)?

The PERL programming language is used instead of the common gateway interface program. It is all due to the various facilities provided by a PERL programming language.

PERL stands for Practical extraction report language.

It is very easy to learn than the gateway interface program. But, the common gateway interface program is really hard to learn and write. A Common gateway interface programs do not have great text processing capabilities like PERL programming language. Also, PERL programming language is a scripting language. In other hands, common gateway interface programs need to be compiled. Also, there is an interpreter for PERL scripts. Here, an interpreter makes a PERL programming language easy to write. Sometimes, it also tests the PERL scripts.

Environment Variables in CGI

There are various environment variables transmitted to the common gateway interface programs by a World Wide Web server. Some of the environment variables are GET, POST, REQUEST-METHOD, etc. The value of QUERY string environment variables is used if they GET method is used. Similarly, CONTENT length environment variables are used if the POST method is used. And, REQUEST method environment variables are used if only the method is either GET or POST.

What Is HTML Frame?

There is a maximum use of hypertext markup language frames in a web browser. It is widely used not to split the information into separate pages or windows. By using HTML frame, some information is not reloaded when the other page changes. In a simple way of understanding, we can define the HTML frame as a tool which divides a web browser into different parts. And, each part has the capability to hold various HTML pages.

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