Check
http://code.google.com/webtoolkit/doc/latest/FAQ_Server.html#What_is_the_Same_Origin_Policy,_and_how_does_it_affect_GWT?

<http://code.google.com/webtoolkit/doc/latest/FAQ_Server.html#What_is_the_Same_Origin_Policy,_and_how_does_it_affect_GWT?>Is
relate to this?

2011/5/5 Greg Dougherty <[email protected]>

> I have a web app that mostly works with IE 7.  However, when I try to
> export results to IE, I get the following error message:
>
> >>>
> Internet Explorer cannot download (URL name) from (web address).
>
> Internet Explorer was not able to open this internet site.  The
> requested web site is either unavailable or cannot be found.  Please
> try again later.
> <<<
>
> Export works by having a frame with a URL.  That part works, because
> my servlet gets called.  My servlet calls
> response.setContentType ("text/tsv");  and
> response.addHeader ("Content-Disposition", "attachment; filename=\"" +
> fileName + "\"");
>
> gets the response Writier, wraps the writer with a BufferedWriter,
> writes some data to it, and then calls flush on the BufferedWriter,
> which gets to the download dialog to pop up for IE.  However, at some
> point while I'm sending it data over that BufferedWriter (and it's
> pretty early in the process, because it never gives me a chance to
> specify where I want to save the file), IE gives me the above error
> message.
>
> Any suggestions for what's going on, and how to fix it?
>
> TIA,
>
> Greg
>
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