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Re: [Acme] [Technical Errata Reported] RFC8555 (5771)

"Salz, Rich" <rsalz@akamai.com> Wed, 03 July 2019 12:14 UTC

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From: "Salz, Rich" <rsalz@akamai.com>
To: Rob Stradling <rob@sectigo.com>, RFC Errata System <rfc-editor@rfc-editor.org>, "rlb@ipv.sx" <rlb@ipv.sx>, "jsha@eff.org" <jsha@eff.org>, "cpu@letsencrypt.org" <cpu@letsencrypt.org>, "jdkasten@umich.edu" <jdkasten@umich.edu>, "rdd@cert.org" <rdd@cert.org>, "kaduk@mit.edu" <kaduk@mit.edu>, "ynir.ietf@gmail.com" <ynir.ietf@gmail.com>
CC: "acme@ietf.org" <acme@ietf.org>
Thread-Topic: [Technical Errata Reported] RFC8555 (5771)
Thread-Index: AQHVMN+rZXOigC8kmE+ph4NqsoW8x6a3ZbAAgAF80gD//+11AA==
Date: Wed, 03 Jul 2019 12:14:26 +0000
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References: <20190702140400.527D3B81CB0@rfc-editor.org> <015B3FA2-45AA-4D06-9C18-99693FB2B785@akamai.com> <368f9853-11e4-1367-9ad0-7dc6f4fa343c@sectigo.com>
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Subject: Re: [Acme] [Technical Errata Reported] RFC8555 (5771)
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>    I don't think so.  IINM, HTTP caching only comes into play when a client 
    sends a subsequent HTTP request message that may (or may not) be 
    satisfied by a cached HTTP response message.
  
A client that follows caching shouldn't send a new request if the cache-control headers on the first response direct it not to, right?

    > Clients could also use If-Modified-Since, right?
    
    Good point.

Then maybe the errata could just be
	Clients SHOULD use an If-Modified-Since header to get more effective caching.

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