Perl CGI Environment Variables
All the Perl CGI program will have access to the following environment variables. These variables play an important role while writing any CGI program in Perl.
| Sr.No | Variables Names & Description |
|---|
| 1 | CONTENT_TYPE
The data type of the content. Used when the client is sending attached content to the server. For example file upload, etc.
|
| 2 | CONTENT_LENGTH
The length of the query information. It's available only for POST requests
|
| 3 | HTTP_COOKIE
Returns the set cookies in the form of key & value pair.
|
| 4 | HTTP_USER_AGENT
The User-Agent request-header field contains information about the user agent originating the request. Its name of the web browser.
|
| 5 | PATH_INFO
The path for the CGI script.
|
| 6 | QUERY_STRING
The URL-encoded information that is sent with GET method request.
|
| 7 | REMOTE_ADDR
The IP address of the remote host making the request. This can be useful for logging or for authentication purpose.
|
| 8 | REMOTE_HOST
The fully qualified name of the host making the request. If this information is not available then REMOTE_ADDR can be used to get IR address.
|
| 9 | REQUEST_METHOD
The method used to make the request. The most common methods are GET and POST.
|
| 10 | SCRIPT_FILENAME
The full path to the CGI script.
|
| 11 | SCRIPT_NAME
The name of the CGI script.
|
| 12 | SERVER_NAME
The server's hostname or IP Address.
|
| 13 | SERVER_SOFTWARE
The name and version of the software the server is running.
|
Here is a small Perl CGI program to list down all the CGI variables supported by your Web server. Click this link to see the result Get Environment
#!/usr/bin/perl
print "Content-type: text/html\n\n";
print "<font size=+1>Environment</font>\n";
foreach (sort keys %ENV) {
print "<b>$_</b>: $ENV{$_}<br>\n";
}
1;
Published on 02-Dec-2019 12:32:28
