Python - CGI Programming

The CommonGateway Interface (CGI) is a set of standards that define how information is exchanged between a web server and a custom script. CGI specifications are currently managed by NCSA.

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What is CGI?

·        The Common Gateway Interface (CGI) is a standard for external gateway programs to interact with information servers such as HTTP servers.

·        The current version is CGI / 1.1 and CGI / 1.2 is under development.

Surf the Internet

To understand the concept of CGI, let's look at what happens when we click a hyperlink to search a specific website or URL.

·        Your browser interacts with the HTTP web server and asks for the URL, i.e. H. The file name.

·        The web server highlights the URL and searches the file name. Otherwise, if it is determined that the file is being restored in the browser, an error message will be sent indicating that you requested an incorrect file.

·        The web browser retrieves the response from the webserver and displays the received file or error message.

However, it is possible to set up the HTTP server so that the file cannot be restored every time a file is requested in a specific directory. Instead, it runs as a program and each output program is returned for display in your browser. This functionality is called the Common Gateway Interface, or CGI, and the programs are called CGI scripts. These CGI programs can be a Python script, a PERL script, a shell script, a C or C ++ program, etc.

Use of Cookies In CGI

HTTP protein is a trivial protocol. For a commercial website, it is necessary to manage session information on different pages. For example, user registration ends after many pages have been completed. How is user-session information stored on all websites?

In many cases, the use of cookies is the best way to store and track settings, purchases, commissions, and other information required for a better visitor experience or site statistics.