[PATCH] Handling of empty responses in AJAX Forms with IFrame transport
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                 Key: COCOON-2027
                 URL: https://issues.apache.org/jira/browse/COCOON-2027
             Project: Cocoon
          Issue Type: Bug
          Components: Blocks: Forms
    Affects Versions: 2.1.11-dev (Current SVN), 2.2-dev (Current SVN)
            Reporter: Jan Oberst


We are experiencing problems with Cocoon Forms under following circumstances:
- Using an AJAX-form
- with file-upload (using the IFRAME Dojo transport accordingly)
- using MSIE 6 or 7
- pressing the cancel button

In this case, an empty response is send. Because of browser limitations, an 
empty response is emulated using the bu:continue browser-update construct. 
Microsoft Internet Explorer expects always HTML response when dealing with the 
IFrame transport, so it cannot handle the XML-response (bu:continute) generated 
by Cocoon.

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