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Subject: Re: [ws-rx] Proposal for i012


Hi Lei,

How does your proposal address the scenario where:
HTTP is being used, there aren't any intermediaries, it is a 
request-response WSDL MEP, and the acks are to be sent using the HTTP 
response (backchannel).

In such a case, what should the value of the [address] property of 
AcksTo EPR be?

-Anish
--

Lei Jin wrote:
> I disagree.  Here is a use case that shows a problem with an anonymous 
> AcksTo.
>  
> Node A  --->  Intermediary ---> Node B
>  
> Node A tries to send messages reliably to Node B.  For simplicity, let's 
> assume these are all oneway messages.  Node A establishes a reliable 
> sequence with an anonymous AcksTo and starts to send messages.  The 
> messages first go through the Intermediary which has B's WSDL and 
> figures out these are oneway messages.  So it decides to send back a 
> http 202 to A and close the connection before forwarding the message on 
> to Node B.  Now Node B gets the message and wants to send back an Ack 
> synchronously (due to the anonymous Ack).  But it can't send the Ack 
> since the connection between Node A and the Intermediary is already closed.
>  
> Basically the problem is that the introduction of anonymous AcksTo 
> converts a oneway MEP into a two-way MEP.  In order for it to work, all 
> intermediaries will need to be WSRM aware and keep connections open in 
> case synchronous acks need to be sent back.
>  
> Proposal:
>  
> * Specifically call out that the anonymous IRI is not to be used in AcksTo.
> * AcksTo may take on the value of the "not allowed" IRI, 
>  "_http://www.w3.org/@@@@/@@/addressing/none_";.  When AcksTo takes on 
> this value, acknowledgement will only be sent back in response to 
> AckRequest messages.
>  
> Lei
>  
> 
>     -----Original Message-----
>     *From:* Marc Goodner [mailto:mgoodner@microsoft.com]
>     *Sent:* Tuesday, August 23, 2005 3:16 PM
>     *To:* ws-rx@lists.oasis-open.org; Lei Jin; Christopher B Ferris
>     *Subject:* [ws-rx] Proposal for i012
> 
>     I believe Chris Ferris had made a similar proposal earlier but in
>     the interest of a +1 and trying to move this along I’ll make a more
>     formal proposal.
> 
>      
> 
>     Proposal:
> 
>     WS-RM was designed to be used with WS-Addressing in which the
>     behavior of the anonymous URI is defined as an address in an EPR.
>     There is no requirement that the anonymous URI must be used and
>     there are valid applications of it, therefore this issue should be
>     closed with no action
> 


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