code: protected org.opensaml.ws.soap.soap11.Envelope getSoapMessage(HttpEntity entity) 
      		throws ClientProtocolException, IllegalStateException, IOException 
      {
          Envelope soapEnvelope = (Envelope) unmarshallMessage(parserPool,
          		entity.getContent());
          EntityUtils.consumeQuietly(entity);
          return soapEnvelope;
      }
docs: Extracts the SOAP message from the HttpResponse
  @param entity the HttpEntity to retrieve the SOAP message from
  @return soapEnvelope the SOAP message
  @throws IOException
  @throws IllegalStateException
  @throws ClientProtocolException