Ajax Unknown error

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In QtWebKit often occurs error "Unknown error" in Ajax requests of type POST
This problem does not occur in conventional browsers (like Google Chrome and Firefox).

It would be possible to create a "DEBUG" all requests that occur within the "QWebView" to analyze the cause of the problem?

bq. Note: There is always occurring, but still quite frequently

Ignore is part:
Is it a bug in QT?
What would be the best way around the problem?

I believe that it is not something simple to discover, would analyze the requests of QtWebKit (using QtWebKit itself) made ​​by Ajax (not the console QWebInspector, I've tried this and did not help me)?