SOLVED-Trying to get the SAML <Assertion> element from a response to Transfer property

Hi,

Sort of answering my original question, the following in a groovy script step seems to be able to get the raw response:

def rawResponse = testRunner.testCase.testSteps["TC1 - NoAttribs"].testRequest.response.rawResponseData
log.info new String(rawResponse)

However, the rawResponse has not just the XML I am interested in, but also the HTTP response headers, etc.:

Wed Apr 04 14:36:19 EDT 2018:INFO:HTTP/1.1 200 OK
Server: Apache-Coyote/1.1
Connection: close
Content-Type: text/xml;charset=UTF-8
Content-Length: 4249
Date: Wed, 04 Apr 2018 18:31:13 GMT
Connection: close

<?xml version="1.0" encoding="UTF-8"?><soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
<soap:Body>
.
.
.

I now need to strip off that stuff to get the XML so that I can then parse it for the <saml2:Assertion> element.  That's the next thing I need to figure out how to do :(...

Does anyone know of an easy way to do that with Groovy?

Thanks,

Jim