CFCACHE and the Fall of Rome

This post is more than 2 years old.

I'm not a huge fan of the CFCACHE tag. It's a blunt instrument and I wish CF would natively roll in a nicer caching system (like, oh say, ScopeCache, not that I'm biased or anything). A user wrote in with a question about CFCACHE. Turns out that when you use cfcache, it outputs a HTML comment before the text which can totally break some browsers.

Luckily - this was actually one of the things fixed in 8.0.1.

Unluckily for the user - he was still on ColdFusion 7.

I thought I'd try to get fancy and use onRequest - another feature I'm not a big fan of - but this seemed like a perfect use for it. I tried something like so:

<cffunction name="onRequest" returnType="void"> <cfargument name="thePage" type="string" required="true"> <cfset var content = ""> <cfsavecontent variable="content"><cfinclude template="#arguments.thePage#"></cfsavecontent> <!--- look for comment at beginning ---> <cfset content = rereplace(content, ""^<!--.*?-->$"", "")> <cfoutput>#content#</cfoutput> </cffunction>

At first - this did nothing. Then I remember that the default behavior of cfcache is to cache both on the client and the server. I switched my cfcache tag to use action=servercache, but unfortunately, you can't use cfcache inside custom tags, and that includes tags like cfsavecontent.

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Raymond is a developer advocate for HERE Technologies. He focuses on JavaScript, serverless and enterprise cat demos. If you like this article, please consider visiting my Amazon Wishlist or donating via PayPal to show your support. You can even buy me a coffee!

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