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RE: 1xx Clarification

From: Yaron Goland <yarong@microsoft.com>
Date: Tue, 15 Apr 1997 16:34:17 -0700
Message-Id: <11352BDEEB92CF119F3F00805F14F4850299D9C5@RED-44-MSG.dns.microsoft.com>
To: "'doug_crow@cacheflow.com'" <doug_crow@cacheflow.com>
Cc: http-wg@cuckoo.hpl.hp.com
Your argument has the underlying assumption that the notification
information was "meant" for a particular user. There are many scenarios,
such as the server saying things like "I am going down" or "My resources
are getting limited" where the asynchronous notification is meant for
whomever has the connection open.

			Yaron

> -----Original Message-----
> From:	doug_crow@cacheflow.com [SMTP:doug_crow@cacheflow.com]
> Sent:	Tuesday, April 15, 1997 11:02 AM
> To:	Yaron Goland
> Cc:	http-wg@cuckoo.hpl.hp.com
> Subject:	RE: 1xx Clarification
> 
> If I understand correctly you are interested in 1xx responses
> appearing within the context of a tcp connection to a HTTP server but
> outside of  the context of a HTTP request.  If this is correct, I
> don't see how this will work through a proxy since proxies generally
> only maintain a connection to the end server for the duration of the
> request.  Even if the proxy maintains a persistent connection to the
> server, the connection may only be allocated to a specific client for
> the duration of a HTTP request.  So in your scenario, going through a
> proxy I think the sequence would be the following:
> 
> User Establishes Connection to Proxy
> User sends GET to Proxy
> 	Proxy Establishes connection to Server
> 		Server sends 1xx Response to Proxy
> 	Proxy sends 1xx response to client
> 	Proxy sends GET to Server
> 		Server sends second 1xx Response to Proxy
> 	Proxy sends second 1xx response to client
> 		Server Sends 200 Response to Proxy
> 	Proxy sends 200 response to client
> 		Server sends third 1xx Response to Proxy
> 	Proxy sends third 1xx response to client
> 	Proxy closes server connection or "assigns" it to another
> "client"
> 		(note that this could happen before the 3rd 1xx response
> is received)
> User Closes Connection to Proxy
> 
> so the first 1xx response makes it through, but not outside of the
> request context.  The second 1xx response works as expected, and the
> 3rd may or may not make it to the client based on a race condition of
> when the proxy closes or "reuses" the server connection.
> 
> -Doug Crow	
Received on Tuesday, 15 April 1997 16:58:54 EDT

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