This signal is emitted when an error occurs during the download
operation. The given
error, of the domain
contains further details of the failure. If the download is cancelled
with webkit_download_cancel(), this signal is emitted with error
WEBKIT_DOWNLOAD_ERROR_CANCELLED_BY_USER. The download operation finishes
after an error and
WebKitDownload::finished signal is emitted after this one.
The default handler is called after the handlers added via
|The data is owned by the caller of the function.