Poll for messages over HTTP

Hi,
Is there a possibility to have a receiving application poll SAP XI over HTTP(S) for available messages?
Through the HTTP adapter, it is quite easy to send message to SAP XI. A small, lightweight (Java) application can do this quite easily. But receiving messages over HTTP(S) from SAP XI is much harder. The receiving application requires a HTTP receiver. But receivers may be located behind firewalls.
Would it be possible to regurlarly check if a message is available on SAP XI for the client?
Scenario:
- a receiver A cannot be (directly) reached by SAP XI
- therefore, SAP XI queues all messages for receiver A
- once in a while, receiver A posts a small message over HTTP to SAP XI: "any messages for me?"
- when messages are available for receiver A, SAP XI returns them in the HTTP response
Wouldn't it be possible to do a clever trick with business processes and correlation?
Kind regards, Guy Crets

Hay Guy,
good question... heres a few idea that bounced to my head, you can:
A. let the messages try to get into reciver A, fail and the queue will get into SYSFAIL and when your reciever go up send a message that will trigger an activate queue command and all the messages "stuck" in the queue will be sent. or
B. cut the interface into two: first part recive messages and put them into a z table and another flow that will be triggered by the reiciver message that will start a program that reads the table and send the messgaes.
I don't like either of these but they both should work.
Uri.

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HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\MSExchangeSA\Parameters
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<Resource for reference>
How does Outlook Anywhere work (and not work):
http://blogs.technet.com/b/exchange/archive/2008/06/20/3405633.aspx
How to use the RPC Ping utility to troubleshoot connectivity issues with the Exchange over the Internet feature in Outlook 2007 and in Outlook 2003:
http://support.microsoft.com/kb/831051
Test Outlook Anywhere Connectivity:
http://technet.microsoft.com/en-us/library/ee633453(v=exchg.150).aspx
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Hi,
I am new to flex/RIA. I am exploring different design choices especially in client server communication. On client side we will be using Flash based RIA (using Actions scripts).
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performance), then using AMF serialization to Actionscript objects is the
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6. Primary advantages? There are many, but mainly you can avoid thinking
about the plumbing and concentrate on solving your application and business
logic problems.
Hope this helps you a little
Tom Jordahl
Adobe

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