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Occasional Ajax error, no status code, no response

 
Bund De
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I'm using JSF 2.2 and Primefaces 5.1

I'm trying to take a "screenshot" of my website using html2canvas, then send it to my back-end to generate a PDF report so the user can download it. The problem is I will occasionally get an ajax error, on Firebug it shows an XHR with no status code, no response, 0 Bytes in size. The download STILL WORKS perfectly, but I get this annoying ajax error that gets picked up by my global ajaxStatus and I have to reload the page.

This is what it looks like on Firebug


This is how I'm doing it with html2canvas.

Onclick event calls a javascript function


The Function


dataURLfield


clickPrintButton function


The hidden download button


Any clues? I've been stuck on this for weeks. Any help is appreciated.
 
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