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[Bug 6432] New: WS-Eventing Push delivery mode does not work when the subscriber is not addressable

From: <bugzilla@wiggum.w3.org>
Date: Wed, 14 Jan 2009 19:12:21 +0000
To: public-ws-resource-access-notifications@w3.org
Message-ID: <bug-6432-2780@http.www.w3.org/Bugs/Public/>


           Summary: WS-Eventing Push delivery mode does not work when the
                    subscriber is not addressable
           Product: WS-Resource Access
           Version: FPWD
          Platform: PC
        OS/Version: Windows NT
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Eventing
        AssignedTo: public-ws-resource-access-notifications@w3.org
        ReportedBy: geoffbu@microsoft.com

from: public list:


My name is Antoine Mensch and I am a member of the OASIS WS-DD TC 
working on the Devices Profile for Web Services (DPWS). We've 
implemented WS-Eventing as part of DPWS for quite some time now, and we 
have run  into the following issue:

The WS-Eventing default delivery mode (used in DPWS) is based on a push 
mechanism that requires the event source to connect to the subscriber to 
deliver the event notification. This creates problems in two very common 
(i) when the subscriber is behind a firewall using NAT;
(ii) when the subscriber is a Web application (e.g. Ajax or Java, Flash 
or Silverlight applets) which cannot accept incoming connections.
Although the first problem can sometimes be solved using dynamic port 
mapping, the second one normally requires a change to the default 
security policy of the Web browser, which is generally not acceptable.

Proposed resolution:
Introduce a special URL to be used as the [address] of the notifyTo / 
endTo endpoint references in the Subscribe message. This special URL 
would inform the event source/subscribtion manager that event 
notifications are not to be sent directly to the subscriber, but rather 
that the subscriber will initiate a connection to fetch them. The 
proposed mechanism could work in a way similar to the one described in 
the WS-MakeConnection specification.

Best regards,

Antoine Mensch

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Received on Wednesday, 14 January 2009 19:12:31 UTC

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