Contents > CFML Reference > Reserved Words and Variables > CGI environment variables > Testing for CGI variables

Testing for CGI variables

Because some browsers do not support some CGI variables, ColdFusion always returns True when it tests for the existence of a CGI variable, regardless of whether the browser supports the variable. To determine if the CGI variable is available, test for an empty string, as shown in the following example:

<cfif CGI.varname IS NOT "">
   CGI variable exists
<cfelse>
   CGI variable does not exist
</cfif>

Contents > CFML Reference > Reserved Words and Variables > CGI environment variables > Testing for CGI variables

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