Frame-Panel sends a second request if leaving the Page

Hi,

we've got a Problem. In our web application we use a frame to display some pdf with the browsers pdf viewer.

If you open the site with the frame the request for the pdf is called twice. If you leave the page the request is send again. As you can see in the picture below.

In Chrome this isn't a problem. But if you do this in Firefox you get an new tab with a black page.

Here is our code to show the pdf: 

 

 @Override
  protected void bindAuskunfteiGesamtObject()
  {
    if (getPageModel().getAuskunfteiGesamtObject().getExpertise().getFullExpertise().trim().length() >0)
    {
      getView().getRatingHeader().setExperise(
          getPageModel().getAuskunfteiGesamtObject().getExpertise().getFullExpertise() );
    }
    getView().getDisclosurePanelPdf().setOpen( false );


    getView().getDisclosurePanelPdf().setUrl( getPdfUrl() );
    getView().getDisclosurePanelPdf().setOpen( true );
  }

But this method isn't called twice. So I have no idea why the request is send twice. 

I hope you can help me.

Thanks in advance

Dominic 

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