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From Ortwin Gl├╝ck <>
Subject Re: [HttpClient] Automatic reconnect in case of closed connection
Date Mon, 23 Sep 2002 12:06:59 GMT
Elwin, Martin wrote:
> Ortwin, not sure if I understand why a retry only should be done for 1.1.
> Would you mind elaborating on the reasons for that? The current retry logic
> is valid for both 1.0 and 1.1, as far as I can tell.

Simply because there is no need for a retry in 1.0. Remember 1.0: The 
server *always* closes the connection. So state of the connection will 
always be "closed" at the beginning of a request.

In 1.1 we have keep-alive connections but which are only kept alive for 
a certain time. So the connection may be expected open but in fact is 
closed. Thus a retry is needed after the first attempt.

But I am not too happy with your patch. IMHO the problem should be 
handled by HttpConnetion and not in any higher levels.

The problematic call in the code is: connection.isOpen()

whose result is unfortunately not related to whether the connection is 
actually open or closed! So its return value is not well-defined.

We'd better fix this HttpConnetion.isOpen() method. Do a read() on the 
input stream. Unless the connection is open -1 is returned. 
Unfortunately read() blocks if the connection is open (and no data is 
available)! Does available() maybe return a meaningful value? This is up 
to the implementation but should work in theory. (Haven't tried)

Martin, could you check this possibility out please?

Kind regards


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