This variable allows you to choose whether the HTML output of your Common Gateway Interface (CGI) program will be cached by the requesting client.
The default value is "1" (on, true, yes), which means there is no caching. By default, the runtime generates "Pragma: no-cache" in the HTML response header that gets sent to the standard output stream. If you set CGI_NO_CACHE to "0" (off, false, no), the runtime suppresses this line of the response header, and the requesting client caches the output.