Only Getting 1 Header from Response (newbie)

I just started working with GWT, and I am having trouble with the getHeaders() method of com.google.gwt.http.client.Response when I make an HTTP Request.  I am only able to get one header from the Response object in the callback of my Request.  The Network tab of the browser indicates that I get all the usual headers in the response (see below).  The status of the Response is 200 (OK), but I am only able to retrieve the "Content-Type" header using getHeaders() and getHeadersAsString() (see further below).  I am using GWT 2.8.0, Firefox 50.1.0, Java 1.7.0_80, Linux Ubuntu, super dev mode.  I am trying to get the information from the Set-Cookie header.  It would be great if someone could tell me what I am doing wrong.  Thanks.

John Michie

Raw Response Headers:
Access-Control-Allow-Credentials: true
Access-Control-Allow-Origin: http://127.0.0.1:8888
Access-Control-Expose-Headers: Content-Language, Expires, Last-Modified, Content-Type, X-Client-Context-Id, Pragma, Cache-Control
Content-Length: 42
Content-Type: application/json.*;charset=ISO-8859-1
Date: Mon, 23 Jan 2017 13:50:01 GMT
Server: Apache-Coyote/1.1
Set-Cookie: JSESSIONID=C931C9B36E6823DD59C5B0FF47773687; Path=/TimeMobileService/; HttpOnly

Information from the Response object:
getStatusCode() = 200
getStatusText() = OK
getText() = { "status_code": 200, "status_txt": "OK" }
getHeaders().length = 1
getHeadersAsString( ) = Content-Type: application/json.*;charset=ISO-8859-1

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