How do I catch jQuery $.getJSON (or $.ajax with datatype set to ‘jsonp’) error when using JSONP?

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Here‘s my extensive answer to a similar question.

Here’s the code:

jQuery.getJSON(handlerURL + "&callback=?", 
    function(jsonResult){
        alert("Success!");
    })
.done(function() { alert('getJSON request succeeded!'); })
.fail(function(jqXHR, textStatus, errorThrown) { alert('getJSON request failed! ' + textStatus); })
.always(function() { alert('getJSON request ended!'); });

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