EIO is not necessarily a proxy error.

Should change error message such as
   "CSync failed to connect through a proxy. 500 Internal Server Error"
To:
   "CSync processing step update failed. 500 Internal Server Error"
Fix crash.

toUtf8() returns a temporary QByteArray wuich is only valid until the
end of the statement (the next ';').  QByteArray::data() returns a
pointer to the QByteArray's data which is only valid if the QByteArray
is valid.
Keeping the char* is therefore wrong.