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SignalR and 500 Errors
public bool AddThing(Thing thing)
{
    // add and notify client
}

public class Thing {
    public Double Foo { get; set; }
}

{"hub":"ThingHub","method":"AddThing","args":[{"Foo":"bar"}],"state":{},"id":1}

$.connection.hub.error(function() {
    console.log('An error occurred...');
});

public bool AddThing(Thing thing)
{
    return true;
}

public class Thing
{
    public Double Foo { get; set; }
}

myHub.addThing({"Foo":"Bar"});

myHub.someMethod()
     .done(function(result) {
     })
     .fail(function(error) {
     });