public Builder withSOAPProtocol(String soapProtocol) {
      this.soapProtocol = soapProtocol;
      return this;
    }
The protocol used to create message factory. Default is "SOAP 1.1 Protocol".

@param soapProtocol a string constant representing the MessageFactory protocol.
@see SOAPConstants#SOAP_1_1_PROTOCOL
@see SOAPConstants#SOAP_1_2_PROTOCOL
@see SOAPConstants#DYNAMIC_SOAP_PROTOCOL
@see MessageFactory#newInstance(String)
soap/src/main/java/feign/soap/SOAPDecoder.java