my $daemon = SOAP::Transport::HTTP::Daemon ->new( LocalAddr => 'localhost', LocalPort => 8080, Reuse => 1 ) ->serializer(My::Serializer->new) ->dispatch_to('My::Server'); BEGIN { package My::Serializer; @My::Serializer::ISA = 'SOAP::Serializer'; sub envelope { $_[2] = (SOAP::Data->name($_[2]) ->prefix('foo') ->uri('http://www.example.org') ) if $_[1] =~ /^(?:method|response)$/; shift->SUPER::envelope(@_); } }