Fix:Manage Firefox and Safari Network error message #44929
      
        
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Not all browsers implement the network error message in the same way:
For example if I execute
fetch('//foo.bar/').catch(err => console.log(err.message))in Chrome / Firefox / Safari browsers console, I get respectively:Failed to fetchNetworkError when attempting to fetch resource.Load failedThis PR fixes it.
Bug
fixes #numbercontributing.md