Check if image Exists, Bug in function.

Question

I found a function that checks to see if an image exists. I
pasted it below, but there seems to be this weird bug. If a
subdomain is in the url of the image but the subdomain is wrong,
you'll get an exception saying: Element Content-Type is undefined
in a CFML structure referenced as part of an expression.

For example, if the correct url is:

http://images.whatever.com/photos/man.jpg

and you change the subdomain like so:

http://imag.whatever.com/photos/man.jpg

The weird thing is that it works even if you mess up the
domain name, directories or image name, but not the subdomain.

original code here:

http://www.succor.co.uk/index.cfm/2007/3/18/How-to-check-if-an-image-exists-with-HTTP

lovewebdev · Answer

I see what was happening, if the subdomain was wrong, no responseheaders were being returned so I adjusted the code to check if response headers are being returned first.

<cfif NOT StructIsEmpty(cfhttp.responseHeader) AND listFind("image/jpeg,image/gif,image/png",cfhttp.responseHeader["Content-Type"])>

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