If you look at the jqgrid demo site and look at "What's new in version 3.2" There should be a section about controlling server errors.
Specifically, it uses a callback parameter loadError:
loadError : function(xhr,st,err) {
jQuery("#rsperror").html("Type: "+st+"; Response: "+ xhr.status + " "+xhr.statusText);
}
As mcv states above, some errors are data errors, so you'll need to handle those specifically.
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