SOAP::Lite::on_action() is used to set a function that will be used to generate the SOAPAction header value. Arg 0 is the SOAP URI, and Arg 1 is the name of the method called. By default, the SOAPAction generated by SOAP::Lite is of the form 'URI#METHOD', but .Net expects 'URI/METHOD'.

Also, if the web service isn't available as HTTP, it'd do no good to change protocols. If on_debug() doesn't work for HTTPS (I don't have any HTTPS webservices to test against), you can always fake it with a custom serializer/deserializer, like the following logic

$lite = SOAP::Lite
  -> uri($namespace)
  -> on_action( sub { join '/', @_[0,1] } )
  -> proxy('https://USERNAME:PASSWORD@wstest.solspark.com')
  -> serializer( My::Serializer->new() )
  -> deserializer ( My::Deserializer->new() )
;

package My::Serializer;
use SOAP::Lite;
use base SOAP::Serializer;

sub serialize {
    my @temp = SUPER::serialize(@_);
    warn @temp;
    return @temp
};

package My::Deserializer;
use SOAP::Lite;
use base SOAP::Deserializer;

sub deserialize {
    warn @_;
    return SUPER::deserialize(@_);
}
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