AJaX submit giving 404 after working for years [was: It worked.. until it didn't.]

Question

Hello, all,I've got a CFC that accepts an AJaX submitted form that has been converted to JSON, converts it back into a form, does form validation, and then puts everything into an Excel spreadsheet. Been working flawlessly for years.I'm in the middle of changing the CAPTCHA, and suddenly I'm getting a 404 error in response.Diagnostics: Failed to add HTML header. ColdFusion was unable to add the header you specified to the output stream. This is probably because you have already used a cfflush tag in your template or buffered output is turned off. The error occurred on line 352.Line 352 of the CFC is:returnSOrigin &= "

POE for Shipment Origin for Cargo #val(sdLoop)# does not exist in form.

" & application.crlf;There is no CFFLUSH being used _anywhere_ in this process. It was working on Friday, now this. Any thoughts?V/r,^ _ ^

WolfShade · Accepted Answer

Nevermind. It's apparently fixed itself. And nothing was changed. No config/settings. No code. No reboots of servers (workstations are rebooted automatically every night.) It just.. started working, again.

This is not an isolated case. This has been happening for at least the 7+ years that I've been here. Something works flawlessly; then it stops working for a day or two; then it miraculously is fixed.

I've given up trying to understand it. I just accept it as a part of working, here.

V/r,

^ _ ^

Charlie Arehart · Answer

I doubt the problem has anything to do with the line indicated. That's simply "the straw that broke the camel's back". (Are we allowed to use that phrase anymore? Or do I need to fear triggering someone about the poor camel?)

Instead, and assuming that the output buffer size has not been decreased (see James' comment), I'd question what has changed about the nature and VOLUME of the generated output on the page. You say you were only changing the captcha. If you revert to the original, does the problem go away? What is different about the new captcha?

Have you compared the page source (in your browser) between the old and new code versions, to see what differs? Note there are underlying Java objects in CF (and Tomcat) that can track the actual output buffer, while it's being built in CFML. Finally, if you have FusionReactor, note that it has a nifty "Request content capture" feature, that can be turned on to track all the request and/or response content of every request. it can be dangerous if left on but for a quick need like this, it can be gold.

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