How to check whether http header is present

Question

How can I check whether Accept-Language header is present in request?
I've tried this, but it produces an error

<cfset requestData = GetHttpRequestData() >
<cfif IsDefined("requestData.Headers['Accept-Language']")>
...

Sorry for probably lame question. That's my first day of ColdFusion coding.

Answer 1

isDefined() is very limited in it's usage, so you can't use associative array notation with it. In almost every case you're better off using StructKeyExists() anyway. So, to solve your problem:

use: <cfif StructKeyExists( RequestData.Headers, "Accept-Language" )>