[webkit-qt] Checking the HTTP status code of more than one instance of QWebPage

[Jocelyn Turcotte]

Hi,

it could certainly be that some error codes trigger different errors while going through WebKit.
Meanwhile I remembered something you might be able to use, QNetworkRequest::originatingObject.
http://qt-project.org/doc/qt-4.8/qnetworkrequest.html#originatingObject

With it you should be able to find out which QWebFrame/Page was associated with a QNetworkReply passed in QNetworkAcessManager::finished, through QNetworkReply::request().

br,
Jocelyn


On Fri, 30 Mar 2012 12:40:17 -0300
ext Alexandre Pretyman <alexandre.pretyman at gmail.com> wrote:

> Hi Jocelyn,
> 
> Thanks for answering, but I have indeed gone down that route, with no
> results, so I thought it wasn't the right way to go.
> 
> I overload virtual bool supportsExtension ( Extension extension ) const;
> with:
> 
> 
>     qDebug() << "SupportsExtension" << extension;
> 
>     return true;
> 
> 
> 
> and I overload: virtual bool extension ( Extension extension, const
> ExtensionOption * option = 0, ExtensionReturn * output = 0 ); with:
> 
>     if (extension == ErrorPageExtension)
> 
>     {
> 
>         const ErrorPageExtensionOption * errorPageOption =
> static_cast<const ErrorPageExtensionOption *>(option);
> 
>         qDebug() << "ErrorPageExtensionOption domain:" <<
> errorPageOption->domain << " errorString:" <<
> errorPageOption->errorString
> 
>                     << "error:" << errorPageOption->error << "URL:" <<
> errorPageOption->url;
> 
>      }
> 
>     else // I know the message below is rubbish, it's just to print
> something if it gets there
> 
>     {
> 
>         qDebug() << "Untreated extension:" << extension << " opts: "
> << option << " output: " << output;
> 
>     }
> 
>     return true;
> 
> 
> And 100% positive they don't get called on HTTP status code 408 (for
> Operation Timed Out) and I don't remember it being called for HTTP status
> code 503 (Service Unavailable) either.
> 
> And the only thing I have logged for this is:
> 
>    SupportsExtension 1
> 
> ErrorPageExtensionOption domain: 0  errorString: "Unknown error" error: 205
> 
> Where:
> 
> Extension 1 = QWebPage::ErrorPageExtension
> domain     0 = QWebPage::QtNetwork
> error     205 = QNetworkReply::ContentReSendError
> 
> 
> But, as mentioned above, never for 408.
> 
> Any other hints?
> 
> Regards
> 
> On Fri, Mar 30, 2012 at 12:05 PM, Jocelyn Turcotte <
> jocelyn.turcotte at nokia.com> wrote:
> 
> > Hello list member,
> >
> > you could have a look at subclassing QWebPage and overriding
> > QWebPage::extension and QWebPage::supportsExtension (
> > http://qt-project.org/doc/qt-4.8/qwebpage.html#extension ).
> >
> > Check for QWebPage::ErrorPageExtension and
> > ErrorPageExtensionOption::domain == QWebPage::Http and then you can feed an
> > appropriate output to ErrorPageExtensionReturn::content from a local file
> > or resource.
> > This method is intended for providing a custom error page to display, but
> > you could also try to handle the error for your app in there.
> >
> > Worst case you can use different QNetworkAccessManagers, but you might get
> > performance issues. Each of them might spawn threads of their own and I
> > think that there is no global limit for parallel connections, only
> > per-instance, so you might get scaling issues when using more than 5-10 of
> > them under heavy load.
> >
> > br,
> > Jocelyn
> >
> >
> > On Fri, 30 Mar 2012 11:44:17 -0300
> > ext Alexandre Pretyman <alexandre.pretyman at gmail.com> wrote:
> >
> > > Hi list,
> > >
> > > I'm using Qt 4.8 release from QtSDK 1.1.5 and the QtWebKit API that comes
> > > with it.
> > >
> > > I'm checking the HTTP Status of a page loaded in a QWebFrame with code as
> > > described in this StackOverflow post:
> > >
> > http://stackoverflow.com/questions/4330274/qtwebkit-how-to-check-http-status-code
> > ,
> > > which essentially tells me to connect to
> > > SIGNAL(finished(QNetworkReply*))  on the QNetworkAccessManager assiciated
> > > with the QWebPage and examine reply->attribute(QNetworkRequest::
> > > HttpStatusCodeAttribute) to get the HTTP status code
> > >
> > > This has been working well since I've been using a single QWebPage, but
> > now
> > > I need more than one instance of QWebPage running.
> > >
> > > Since the recommended practice is to have one QNetworkAcessManager per
> > > application, if I connect to SIGNAL(finished(QNetworkReply*)) , I
> > > understand I'll be getting QNetworkReply * from both instances, and won't
> > > be able to differentiate which came from which.
> > >
> > > How can I overcome this?
> > >
> > > Regards,
> >
> >
> 
>