Adding response headers in restlet 2.1.x

[Michael Kaye]

Previously in 2.0.x, I added response headers as follows, 

Form responseHeaders = (Form) 
getResponse().getAttributes().get("org.restlet.http.headers"); 
if (responseHeaders == null) { 
    responseHeaders = new Form(); 
    getResponse().getAttributes().put("org.restlet.http.headers", 
responseHeaders); 
} 
responseHeaders.add("Access-Control-Allow-Origin", "*"); 

How do I add them now in 2.1? I need to create a new header series, 

Series<Header> responseHeaders = ....   // How do I get or create the series 
responseHeaders.add("Access-Control-Allow-Origin", "*"); 
HeaderUtils.addResponseHeaders(getResponse(), responseHeaders);

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