WebService Client - how to enable HTTP Compression

Question

Hi
I have written a simple WebService Client. The WebService expects that the WebService clients enable HTTP compression. This is the exact text from the docs:-
""1. Client should be HTTP Compression enabled
HTTP Compression had been made mandatory for API�s. Thus API�s client should
include �Accept-Encoding: zip� header as part of request and should be able to
handle compressed data. Please note that system will send an error message if client
are not http compression enabled saying client should be compression enabled."
I do not know how to enable HTTP compression in the WebService Client. The method called is "GetInstantaneousFlowData". It accepts no arguments and returns xsd:datetime.
The wsdl can be found at:-
http://energywatch.natgrid.co.uk/EDP-PublicUI/PublicPI/InstantaneousFlowWebService.asmx?WSDL
Can someone please help :-
import javax.xml.rpc.ServiceFactory;
import javax.xml.rpc.Service;
import javax.xml.rpc.Call;
import javax.xml.rpc.ParameterMode;
import javax.xml.namespace.QName;
import java.util.Calendar;
public class TestNGPubTime4 {
public static void main(String[] args) throws Exception {
     // Setup the global JAX-RPC service factory
     System.setProperty( "javax.xml.rpc.ServiceFactory", "weblogic.webservice.core.rpc.ServiceFactoryImpl");
// create service factory
ServiceFactory factory = ServiceFactory.newInstance();
// define qnames
String targetNamespace = "http://www.NationalGrid.com/EDP/BusinessEntities/Public/";
QName serviceName = new QName(targetNamespace, "InstantaneousFlowWebService");
QName portName = new QName(targetNamespace, "InstantaneousFlowWebServiceSoap");
QName operationName = new QName("http://www.NationalGrid.com/EDP/UI/GetInstantaneousFlowData",
     "GetLatestPublicationTime");
// create service
Service service = factory.createService(serviceName);
// create call
Call call = service.createCall();
// set port and operation name
call.setPortTypeName(portName);
call.setOperationName(operationName); // add parameters
     call.setProperty(Call.SOAPACTION_USE_PROPERTY, Boolean.TRUE);
     call.setProperty(Call.SOAPACTION_URI_PROPERTY, "http://www.NationalGrid.com/EDP/UI/GetInstantaneousFlowData");
//     call.setProperty(Call.ENCODINGSTYLE_URI_PROPERTY, "http://schemas.xmlsoap.org/soap/encoding/");
call.setReturnType(new QName( "http://www.w3.org/2001/XMLSchema","datetime") );
// set end point address : soap address location
call.setTargetEndpointAddress("http://energywatch.natgrid.co.uk/EDP-PublicUI/PublicPI/InstantaneousFlowWebService.asmx");
// invoke the remote web service
Calendar result = (Calendar) call.invoke(new Object[] {});
System.out.println("result=" + result);
}

Answer 1

Rishika,
Thanks for your reply.
Could I get clariffication on some more thing?
I am using Axis 1.4 version. And I am able to implement the gzip while doing the following steps.
1) Change the pivote value to CommonsHTTpSender.
<transport name="http" pivot="java:org.apache.axis.transport.http.CommonsHTTPSender"/>
2) public class RetreiveReservationsSOAPBindingStubLocal extends RetreiveReservationsSOAPBindingStub.
I Override the method to support GZIP.
org.apache.axis.client.Call _call = super.createCall();
call.setOperation(operations[0]);
_call.setUseSOAPAction(true);
_call.setSOAPActionURI("retreiveReservations");
_call.setEncodingStyle(null);
call.setProperty(org.apache.axis.client.Call.SENDTYPE_ATTR, Boolean.FALSE);
call.setProperty(org.apache.axis.AxisEngine.PROPDOMULTIREFS, Boolean.FALSE);
call.setProperty(HTTPConstants.MCACCEPT_GZIP, Boolean.TRUE);
call.setProperty(HTTPConstants.MCGZIP_REQUEST, Boolean.TRUE);
call.setSOAPVersion(org.apache.axis.soap.SOAPConstants.SOAP11CONSTANTS);
_call.setOperationName(new javax.xml.namespace.QName("", "retreiveReservations"));
super.setRequestHeaders(_call);
super.setAttachments(_call);
Object resp = call.invoke(new Object[] {retreiveReservationsRequest});
I am able to send and receive the request and response in gzip encoded format.
Now my clarrification is,
Is it possible to set the piote value to CommonsHTTPSender for the transport http through my code?
How could I set the values from code?
Reason is, I don't want to manually edit the axis 1.4's client-config.wsdd
Since this is very critical thing, please please help me.
Thanks in advance.
Regards,
Nishad Ponery