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https://issues.apache.org/jira/browse/WICKET-3869?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14161504#comment-14161504
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Rakesh A commented on WICKET-3869:
----------------------------------

One specific case we observed, which might also help identifying the cause is 
with 'background image of modal dialog mask'. Wicket sets the 
'background-image' property of modal dialog mask to 'none' using JavaScript, 
but the CSS sets the background image prior to this. May be because of some 
delay IE starts requesting the image set via CSS, and JavaScript sets it to 
'none' before it completes loading the image, and causes the exception.

We fixed by setting the 'background-image' property to 'none' in our CSS.

body div.wicket-mask-dark {
   background-image: none;
   ...
}

But now we get the same exception for other resources.

> ResponseIOException when ajax response contains resource reference
> ------------------------------------------------------------------
>
>                 Key: WICKET-3869
>                 URL: https://issues.apache.org/jira/browse/WICKET-3869
>             Project: Wicket
>          Issue Type: Bug
>          Components: wicket
>    Affects Versions: 1.5-RC5.1
>         Environment: Internet Explorer
>            Reporter: Sodasmile
>              Labels: ResponseIOException, explorer, internet
>             Fix For: 1.5-RC6
>
>         Attachments: Eofproject.7z, internetexplorer-requests.png, 
> iwicket-no-image.tgz, iwicket.zip, lazyloaderror.zip
>
>
> When ajax response (show modal window) contains shared image response, server 
> log reports ResponseIOException.
> See attached example application. Using maven, type mvn package jetty:run. 
> Open http://localhost/8080/iwicket/ in Internet Explorer, click the link, 
> watch server log (may need to open/close modal window a few times, but 
> usually appears on first attempt). 



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