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Re: Does no-store in request imply no-cache?

From: Adrien de Croy <adrien@qbik.com>
Date: Mon, 18 Oct 2010 16:24:08 +1300
Message-ID: <4CBBBDD8.7050402@qbik.com>
To: "Eric J. Bowman" <eric@bisonsystems.net>
CC: HTTP Working Group <ietf-http-wg@w3.org>, David Morris <dwm@xpasc.com>

in reference to your statement

"Actually, unsafe request methods MUST invalidate the cache; since the
response may not follow the same path as the request, there's no way
for a cache to know whether the request was successful or not -- better
safe than sorry."


The "path" I'm talking about is a chain of TCP-based HTTP agents not 
about IP hosts (irrelevant in this discussion).

talking about IP and tracerts is a complete red herring.  These agents 
are the parties in TCP connections.  Sure, the IP packets may go via 
different routers between the endpoints, but the endpoints are the 
endpoints.


On 18/10/2010 3:44 p.m., Eric J. Bowman wrote:
> Adrien de Croy wrote:
>> I don't see how on a TCP connection a response message can go via a
>> different path than the request message.  That would break everything.
>>
> IP is connectionless.  Asymmetrical routing is quite common on the
> Internet, don't make me post a traceroute...  TCP is what keeps
> everything from breaking.
>
> -Eric
Received on Monday, 18 October 2010 03:24:46 GMT

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