[Standards] Idle sreams in RFCbis

Jiří Zárevúcky zarevucky.jiri at gmail.com
Mon May 25 10:39:22 UTC 2009


2009/5/25 Artur Hefczyc <artur.hefczyc at tigase.org>:
> Hi,
>
>> I would like to provide feedback on these two sections:
>>
>> 5.7.3.  Handling of Idle Streams
>>
>> http://xmpp.org/internet-drafts/draft-saintandre-rfc3920bis-09.html#streams-close-idle
>>
>> 12.7.  Whitespace
>>
>> http://xmpp.org/internet-drafts/draft-saintandre-rfc3920bis-09.html#xml-whitespace
>>
>>
>> In 5.7.3, it says:
>> "The typical method for detecting an idle TCP connection is to send a
>> space
>> character (U+0020) over the TCP connection between XML stanzas, which is
>> allowed for XML streams as described under Section 12.7 (Whitespace)."
>>
>> Strictly speaking:
>> - the sending entity does not detect the loss of connection when it sends
>> whitespaces
>
> I think you are not right here. From my experience the sending entity only
> can
> detect connection loss not the receiving.
> This is because sometimes TCP/IP doesn't get notified of simple connection
> loss if there is no data transmission over the link.
> Only when you attempt to send some data, even a single character, the TCP/IP
> stack tries to deliver it to the destination address. Of course if the
> connection
> is broken, the attempt fails and an error is returned to sending
> application.
>
> Artur
>

That's right, but from my experience the timeouts are waaaaaay too
long to be useful.



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