Dear Monks, I am accessing a .NET based web service using PERL's SOAP::Lite module. Though the code is working fine for me during one of perforamnce tests by the service provider the guy from other end told me that he is receiving requests from my server twice the first one being sent as a null request and the other one which i actually want to send. I get the response correctly and my trace log also shows request being sent and response received as it should be, This service requires a HTTP authorisation which i do as directed in module, after much discussion with the service provider he told me that it might be happening because of my application sending first null request to authenticate which results in exception on their end and he also told that the clients written in .NET need to set a directive to TRUE in order to stop this kind of behaviour but unfortunately i dont know .NET and he is not aware of PERL.

I am writing this after searching on google and perlmonks about http basic authentication used in SOAP Lite but could manage to find questions about them not working correctly and not about the behaviour also tried to read code from LWP::Useragent to find out how it works but did not understand much of it. I request you to please tell me if this is because of authentication and how authentication works.

This is my code 
       #$PARAM has all the parameters needed to make client 
    use SOAP::Lite +trace =>'debug';
    my $xmlRequest = '<Request>'.(shift).'</Request>';
    my $xmlFilter = '<Filter>'.(shift).'</Filter>';
    my $webService = SOAP::Lite-> uri($PARAM->{NAMESPACE})
                   -> on_action(sub{sprintf '%s/%s', @_ })
                   -> outputxml("1")
                   -> proxy($PARAM->{ENDPOINT});
    my $response='';
    eval{
        $response = $webService->call(SOAP::Data->name("SubmitXml")->a
+ttr({xmlns => $PARAM->{NAMESPACE}}),
                          SOAP::Data->name(Profile => $PARAM->{PROFILE
+})->type('string'),
                                              SOAP::Data->name(Request
+ => $xmlRequest)->type('xml'),
                                              SOAP::Data->name(Filter 
+=> $xmlFilter)->type('xml')
                    );
     };
     if($@){print $@;}

        print $response;



    sub SOAP::Transport::HTTP::Client::get_basic_credentials{ 
    return $PARAM->{USER_ID} => $PARAM->{PASS};
    }

    Trace reported by Client

    SOAP::Transport::new: ()
    SOAP::Serializer::new: ()
    SOAP::Deserializer::new: ()
    SOAP::Parser::new: ()
    SOAP::Lite::new: ()
    SOAP::Transport::HTTP::Client::new: ()
    SOAP::Data::new: ()
    SOAP::Data::new: ()
    SOAP::Data::new: ()
    SOAP::Data::new: ()
    SOAP::Lite::call: ()
    SOAP::Serializer::envelope: ()
    SOAP::Serializer::envelope: SOAP::Data=HASH(0xeb4240) SOAP::Data=H
+ASH(0xeb58f0) SOAP::Data=HASH(0xeb59b0) SOAP::Data=HASH(0xeb5a70)
    SOAP::Data::new: ()
    SOAP::Data::new: ()
    SOAP::Data::new: ()
    SOAP::Data::new: ()
    SOAP::Transport::HTTP::Client::send_receive: HTTP::Request=HASH(0x
+ee4820)
    SOAP::Transport::HTTP::Client::send_receive: POST https://webservi
+ces.xxxxxxxx.com HTTP/1.1
    Accept: text/xml
    Accept: multipart/*
    Accept: application/soap
    Content-Length: 2025
    Content-Type: text/xml; charset=utf-8
    SOAPAction: http://webservices.xxxxxxx.com/SubmitXml



    <?xml version="1.0" encoding="UTF-8"?><soap:Envelope xmlns:xsi="ht
+tp://www.w3.org/2001/XMLSchema-instance" xmlns:soapenc="http://schema
+s.xmlsoap.org/soap/encoding/" xmlns:xsd="http://www.w3.org/2001/XMLSc
+hema" soap:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/" 
+xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/"><soap:Body><Su
+bmitXml xmlns="http://webservices.xxxxxx.com"><Profile xsi:type="xsd:
+string"></Profile><Request></Request><Filter><_/></Filter></SubmitXml
+></soap:Body></soap:Envelope>
    SOAP::Transport::HTTP::Client::send_receive: HTTP::Response=HASH(0
+x1215920)
    SOAP::Transport::HTTP::Client::send_receive: HTTP/1.1 200 OK
    Connection: close
    Date: Thu, 02 Apr 2009 10:38:09 GMT
    Server: Apache-Coyote/1.1
    Content-Type: text/xml;charset=utf-8
    Client-Date: Thu, 02 Apr 2009 10:35:43 GMT
    Client-Peer: 12.17.227.105:443
    Client-Response-Num: 1
    Client-SSL-Cert-Issuer: /C=US/O=Equifax/OU=Equifax Secure Certific
+ate Authority
    Client-SSL-Cert-Subject: /C=US/ST=Georgia/L=Atlanta
    Client-SSL-Cipher: RC4-MD5


    <?xml version="1.0" encoding="UTF-8"?>
    <soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/e
+nvelope/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="htt
+p://www.w3.org/2001/XMLSchema-instance">
     <soapenv:Body><SubmitXmlResponse xmlns="http://webservices.xxxxx.
+com"><SubmitXmlResult>
     </SubmitXmlResult></SubmitXmlResponse></soapenv:Body></soapenv:En
+velope>
    SOAP::Lite::DESTROY: ()
    SOAP::Deserializer::DESTROY: ()
    SOAP::Parser::DESTROY: ()
    SOAP::Transport::DESTROY: ()
    SOAP::Transport::HTTP::Client::DESTROY: ()
    SOAP::Serializer::DESTROY: ()
    SOAP::Data::DESTROY: ()
    SOAP::Data::DESTROY: ()
    SOAP::Data::DESTROY: ()
    SOAP::Data::DESTROY: ()
    SOAP::Data::DESTROY: ()
    SOAP::Data::DESTROY: ()
    SOAP::Data::DESTROY: ()
    SOAP::Data::DESTROY: ()
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