QNetworkReply::ContentReSendError error, when keepalive connection closed, on Ajax Posts from QWebView page

Steps to reproduce:
Create a simple Gui application with single QWebView.
Create a simple QNetworkManager, assign it to QWebView page.
Connect requestFinished signal, to check for errors.
Create a simple html page, at your webserver, with one button
wich performs Ajax POST to the same domain, make your webserver return 200 http result code for that POST.
Run application, press button for one time, your will get positive reply. Wait for keepalive connection to timeout. Press button again you will get ContentReSendError.
This bug may be related to QTBUG-19480