Venerable Monks,
I am trying to call a web service using SOAP with a WSDL using either XML::Compile or SOAP::Lite...

Using XML::Compile

my $soap_wdsl = 'example.wsdl'; # retrieved previously
my $client = XML::Compile::WSDL11->new( $soap_wdsl );
my $call = $client->compileClient('setTransaction');
my $response = $call->( $params );


<SOAP-ENV:Envelope
    xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/">

<SOAP-ENV:Body>
    <tns:setTransaction xmlns:tns="http://soap.example.com/" xmlns:xsi
+="http://www.w3.org/2001/XMLSchema-instance">
        <PARAMS HERE>
    </tns:setTransaction>
</SOAP-ENV:Body>
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This works fine, but I have to add security headers which are not defined in the WSDL - you can see a solution at the FAQ but I can't work out how to implement it. Has anyone managed to use this example?

Now I can add headers easily enough with SOAP::Lite, but I have a problem with that too.

Using SOAP::Lite

my $soap_wdsl = 'https://example.com/service/API?wsdl';
my $client = SOAP::Lite->new;
$client->proxy( $soap_wdsl );
$client->service( $soap_wdsl );
my $response = $client->setTransaction( $params );

<SOAP-ENV:Envelope
    xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/">

<SOAP-ENV:Body>
    <setTransaction>
        <PARAMS HERE>
    </setTransaction>
</SOAP-ENV:Body>
[download]

This doesn't work because it is not setting the namespace in the setTransaction tag. I found a solution by adding this line:

$client->ns('http://soap.example.com/');

<SOAP-ENV:Envelope
    xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/"
    xmlns:namesp1="http://soap.example.com/">

<SOAP-ENV:Body>
    <namesp1:setTransaction>
        <PARAMS HERE>
    </namesp1:setTransaction>
</SOAP-ENV:Body>
[download]

But I don't want to hard code the URL as I feel that defeats the purpose of the WSDL - what if it changes down the line? Is there a way to retrieve that namespace URL from the WSDL so I can add it dynamically? Or some other way to get SOAP::Lite to add it properly?

Just for reference, I have a PHP example which works properly (and no issues adding headers):

$soap_wdsl = 'https://example.com/service/API?wsdl';
$client = new SoapClient( $soap_wdsl ); 
$response = $client->setTransaction( $params ); 

<SOAP-ENV:Envelope
    xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/"
    xmlns:ns1="http://soap.example.com/">

<SOAP-ENV:Body>
    <ns1:setTransaction>
        <PARAMS HERE>
    </ns1:setTransaction>
</SOAP-ENV:Body>
[download]