Send message to server when closing brwosertab

Hi Guys,

I have a little problem. I want my server to do some stuff when the user close a tab in his browser. 

So I used the onWindowsClosing method but the call towards the server often dosn't work.

Is there a possiblity to do something like this? 

I only need to parse an id to my server. 

Thanks in advance

Dominic 

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