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The bad news is that you have to do it at all, and that if you don’t do it, it can have such unfortunate and unexpected impact. And just as bad, again, is that hardly anyone has talked about it.
This entry will elaborate on the issue and a couple of other possible CFDocument performance issues, as a bonus. I’ve been meaning to write about the importance of this problem and solution the LocalURL attribute for a long time it came out in CF8. Often when I’m helping people with CF troubleshooting problems, whether on mailing lists or in my consulting servicesI’ve been able to show that long-running requests or an unexpectedly excessive number of requests were sometimes due to this very problem.
Basics of the LocalURL attribute Before we go any further, let’s start with the details of the attribute which may surprise many. A side effect of this is Server ends up sending HTTP request even for local URL or images that are lying on the local file system which obviously hurts the performance. In ColdFusion 8, we have added a new attribute “localURL” to cfdocument tag which if enabled, will try to resolve the relative URLs as file on the local machine.
This would make the cfdocument engine retrieve the images directly from the file system rather then asking the server for it over http This attribute helps reducing the load from the server so that the same web server thread can now serve user request instead of serving local images to CFDocument. This also addresses some of the “missing image” problems which I mentioned here. Here is a sample code using this attribute.
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It would help to make a point of clarification: As such, CF will need to “get” whatever images or scripts or css files are defined on the generated HTML page as img src, script src, link href, etc. That’s what causes the problem, if there are many of them. Sadly, this issue is only barely mentioned in the CF Docs page on CFDocumentand it would be easy to miss the point it’s trying to make.
How some tried to workaround the problem with file: Among the entries discussing this were: Second, there are certainly still other possible CFDocument performance issues, and the following other resources address some of those: Let me know what you think. Comments 10 Comments [ Add Comment ] This is kind of unrelated, but relevant at the same time imo.
I was having an issue where cfdocument was never completing for one report I was creating. This might have been a unique issue in my case, but hopefully can save someone else some time. Quick back story cgdocument we’re going through PCI compliance and our servers that handle credit cards need to be blocked off from the servers that don’t. We added an exception to the hosts file to fix this issue.
I’ll file this away for future reference: Mark, thanks for the encouragement! As for a place to “file it away”, check out my relatively new cf You’ll see it’s a place I’m organizing info related to CF server troubleshooting, both knowledge info and resources links to blog entries, articles, presos, and more whether by me or others. I want it to be a one-stop shop to find all the great stuff focused on cf server troubleshooting, organized and carefully maintained, much like my CF which focuses instead on generic tools and resources of interest to all CFers, but for now just one huge pageor my UGTV focused on recorded presos, for now a DB-driven list approach.
We’ll see how the wiki approach goes, and also whether I may open it up to be edited by others. I’ll be doing so myself once I have more stuff from a few more people, and may also expand stlye the “info” on each topic that I may provide on some of the pages, beyond just resources.
But to your point, the idea of “filing away a resource for reference” is exactly what I want this to be, and for everyone’s benefit.
If not, I wonder if somehow it takes longer to get external references when localurl is true. There’s not really any discussion in those docs or my experience to tell.
But if you may have focused only on looking at img src tags, check also cfdocumemt src’s, link href’s, and so on. If any of them are not local, then it would seem you should not use the localurl again, I don’t know for sure, but the point is to use it when all those things ARE local files. Let us know what you may find. I’ll add, as well, that you can use a tool like FusionReactor, or the CF Server Monitor or SeeFusion, to do a stack trace while that request is running, cfdocuemnt see what it IS doing that’s taking so long.
See a blog entry I did: I can also help with that or this in particular via my remote, short-term CF server troubleshooting consulting services: Tsyle way, do let us know how you get on, Jason. Once I resolved those issues the. Cfdovument for your response, and for this amazing resource! I was at your CFSummit troubleshooting session and you alluded to this CFDocument performance issue cfdocuument we’ve been fighting with for some time.
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So about what you observe, I’ll note that I don’t think you should have to use the file: You should be able to just use a relative path reference, as far as I syle and so I would not think expandpath should be needed, either, as that converts the path to an absolute one.
That would surprise me, but I’ll admit that the whole localurl feature is not really well-documented. If you may have some simple example that can demonstrate the problem, perhaps I or others can run it on our own machines. In my large cfdocument, I have a call to a style sheet.
I just changed to a CF template, wrapped it in cfoutput and cfinclude’d it. However, in the style sheet, I have a call to a background image. Can’t quite get that to work.
No error, but no background image. I currently have as a body attribute: Just can’t get it to work What has prompted that? Have you tried removing it? And do you realize that expandpath creates an absolute URL?
What if you just created a web-root relative URL? And are you or are you not the localurl? Some combination of these things should work, unless you have a mistaken path or perhaps a web server configuration problem. That said, this blog entry is about using the localurl attribute of cfdocument. To find them, and other resources for finding help, see my cf What’s a CF shop to do: Yep, Bernie, that’s interesting to note.
I had not noticed it that the support matrix said only jdk I was so excited to see it run on CF and see that it could be a real option for cfdocumrnt moving forwar And I see now where the “commercial” discussion came from.
First, as I show above, stylr CL OK, I have confirmed now more specifics, about whether this issue is about “commercial” us Managed Hosting Services provided by. Charlie Arehart’s Server Troubleshooting Blog. November 19, 3: Charlie Arehart Related Categories: This is something that I find nearly no one has talked about, as a problem and solution. This can be quite tragic. This is kind of unrelated, cfdoucment relevant at stle same time imo. Matt, thanks for the extra info.
Charlie, Thank you very much for this valuable blog, I have been working on a large scale application to manipulate PDFs, I will definitely revisit my sryle to make sure I’m using localURL. Hi Charlie, As it turns out, I wasn’t using “file: Jason, thanks for the update and the kind regards.
Working through this a bit further Randi, I see you using the file: Email Twitter Facebook Cfdocumejt. Enter your email address to subscribe to this blog.
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