The HTTP response body also has a SOAP envelope and body at the top level.
<SOAP-ENV:Envelope
xmlns:SOAP-ENV="http://www.www.org/soap/envelope/"
SOAP-ENV:encodingStyle="http://www.www.org/soap/encoding/"
>
<SOAP-ENV:Body>
<!-- response details here -->
</SOAP-ENV:Body>
</SOAP-ENV:Envelope>