From: "NAKAMURA, Hiroshi" <nakahiro@...>
Date: 2007-06-05T13:33:28+09:00
Subject: Re: Add namespace to the SOAP Body and Header

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Hi,

David Alphen wrote:
> So I need several things:
> 
> _add namespaces to the Header and Body tags,
> _plus the Header tag is empty, it does not contain any element (I have seen
> lots of example that add element to the header but not just an empty
> header):
> 
> <soap:Header xmlns="http://webservices.amadeus.com/definitions
> "></soap:Header>

Following code samples require soap4r-1.5.6 RC2.  You need to get 1.5.6
RC2 from http://dev.ctor.org/soap4r/wiki#a2007-06-05:1.5.6-RC2

1. empty SOAP Header

soap4r-1.5.5 cannot send empty SOAPHeader.  With 1.5.6, you can do that
like this;

  require 'soap/rpc/driver'
  require 'soap/header/handler'

  class EmptyHeaderHandler < SOAP::Header::Handler
    def on_outbound(header)
      # dump SOAPHeader even if it has no item
      header.force_encode = true
      header.extraattr['xmlns'] = 'urn:foo'
      # no item needed
      nil
    end
  end

  driver = SOAP::RPC::Driver.new('http://localhost:7171/soapendpoint')
  driver.wiredump_dev = STDOUT
  driver.headerhandler << EmptyHeaderHandler.new(XSD::QName::EMPTY)
  driver.add_method('nop').call


2. free namespace definition control

At first, XML processors must handle both A and B as the same.

  A. <env:Body>
       <n1:Air_MultiAvailability xmlns:n1="http://my.url.com/SAR_07"/>
     </env:Body>
  B. <env:Body xmlns="http://my.url.com/SAR_07">
       <Air_MultiAvailability/>
     </env:Body>

But I can understand that there's a case we cannot change other party's
SOAP implementation.  For the case of this, you need to construct XML by
yourself like this;

  driver = SOAP::RPC::Driver.new('http://localhost:7171/soapendpoint')
  header = SOAP::SOAPHeader.new
  header.extraattr['xmlns'] = 'urn:foo'
  header.force_encode = true
  require 'rexml/document'
  body = SOAP::SOAPBody.new(
    REXML::Document.new('<Air_MultiAvailability/>'))
  body.extraattr['xmlns'] = 'urn:foo'
  driver.invoke(header, body)

Of course you'd better to ask the other party to fix the implementation.

Regards,
// NaHi

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