如何在Apex RemoteAction上设置statusCode？

Question

我正在使用Apex RemoteAction

Visualforce.remoting.Manager.invokeAction(
    '{!$RemoteAction. SomeTestControllerController.oneRemoteAction}', 
    'someString', 
    function(result, event){
        // Handle ...
    }, 
    {escape: true}
);

在event内有statusCode。

{
    'action': "SomeTestControllerController"
    'method': "oneRemoteAction"
    'ref': false
    'result': false
    'status': true
    'statusCode': 200
    'tid': 2
    'type': "rpc"
}

如何从Apex代码中设置statusCode？

@RemoteAction
public static MyDtoObject oneRemoteAction(String Oneparam) {
    // Set the statusCode ...
    return null;
}