How to check or show notice when web url colud not load in WebViewer or in Web component?

I have tried almost everything but could not get it out…
Please help me out…

The webviewer component automatically notify you like “ERR NO INTERNET CONNECTION” or “ERR NAME NOT RESOLVED”.

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Also there is a block in web component
Got Text. You can simply use the response codes

when I got this type of message in web viewer then web viewer will be disabled and circular progress will start