CGI Environment Variables in Python

All the CGI programs have access to the following environment variables. These variables play an important role while writing any CGI program.

Sr.No. Variable Name & 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.
2 CONTENT_LENGTH
The length of the query information. It is 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. It is 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 is useful logging or for authentication.
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 small CGI program to list out all the CGI variables.

#!/usr/bin/python
import os
print "Content-type: text/html\r\n\r\n";
print "<font size=+1>Environment</font><\br>";
for param in os.environ.keys():
   print "<b>%20s</b>: %s<\br>" % (param, os.environ[param])
Updated on: 2020-01-31T07:48:09+05:30

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