Suitelet - https.serverResponse Setting StatusCode

Hello,

I'm currently sending https rest call to suitelet and is able to set header and response.

however i want to limit the suitelets access and have it return a 404 status or 400 when the request parameters are invalid.

I could not find any information regarding how to set the status code on the https.serverResponse

here is basically what i want to do

 function onRequest(context) {          var request = context.request;          var method = context.request.method;          var params = request.parameters;            //possible check for authentication          var allowed = do_checks(params); //return bool          if(!allowed){             // how to set status code here?              context.response.setStatusCode(404);                return;          }  }