How to write SOAP client that manually parses XML response

I am currently using a TCP/IP-based service that receives a serialized XML request and returns a serialized XML response. It has been converted to a SOAP service; the XML request and response remain unchanged. I want to write a minimal SOAP client in C++ that continues to parse the XML response using the existing code. I have experimented with gSOAP, but it generates C++ classes and deserializes the XML into them. I don't want that; I want it to provide me the XML response inside the SOAP body, but cannot see how to do that.

Does anyone know how to do it, using gSOAP or another SOAP client library?