Solution :
CGI Environment Variables plays an very important role in web application development. If you are using perl for developing web application then you must know about CGI Environment Variables. These are the series of some hidden values that the web server(apache or can be other) sends to every CGI program you run on browser. Your program can parse them and use the data they send. Environment variables are stored in a special hash named %ENV.
Most of the frequently used CGI Environment Variables are:
CGI Environment Variables plays an very important role in web application development. If you are using perl for developing web application then you must know about CGI Environment Variables. These are the series of some hidden values that the web server(apache or can be other) sends to every CGI program you run on browser. Your program can parse them and use the data they send. Environment variables are stored in a special hash named %ENV.
Most of the frequently used CGI Environment Variables are:
| Key | Value |
| DOCUMENT_ROOT: | The root directory of your server |
| CONTENT_LENGTH: | The length, in bytes, of the input stream that is being passed through standard input. |
| PATH_INFO: | The extra path information followin the script's path in the URL. |
| HTTP_COOKIE: | The visitor's cookie, if one is set |
| HTTP_HOST: | The hostname of the page being attempted |
| HTTP_REFERER: | The URL of the page that called your program |
| HTTP_USER_AGENT: | The browser type of the visitor |
| HTTPS: | "on" if the program is being called through a secure server |
| PATH: | The system path your server is running under |
| QUERY_STRING: | The query string (see GET, below) |
| REMOTE_ADDR: | The IP address of the visitor |
| REMOTE_HOST: | The hostname of the visitor (if your server has reverse-name-lookups on; otherwise this is the IP address again) |
| REMOTE_PORT: | The port the visitor is connected to on the web server |
| REMOTE_USER: | The visitor's username (for .htaccess-protected pages) |
| REQUEST_METHOD: | GET or POST |
| REQUEST_URI: | The interpreted pathname of the requested document or CGI (relative to the document root) |
| SCRIPT_FILENAME: | The full pathname of the current CGI |
| SCRIPT_NAME: | The interpreted pathname of the current CGI (relative to the document root) |
| SERVER_ADMIN: | The email address for your server's webmaster |
| SERVER_NAME: | Your server's fully qualified domain name (e.g. www.cgi101.com) |
| SERVER_PORT: | The port number your server is listening on |
| SERVER_SOFTWARE: | The server software you're using (e.g. Apache 1.3) |
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