W3C home > Mailing lists > Public > ietf-http-wg@w3.org > January to March 2012

Re: If-None-Match + Range

From: Zhong Yu <zhong.j.yu@gmail.com>
Date: Mon, 16 Jan 2012 00:58:58 -0600
Message-ID: <CACuKZqGxQmfpaPGrjZONHsSUbPmn-fH0m+Z_POjfQepDExqQ9g@mail.gmail.com>
To: Julian Reschke <julian.reschke@gmx.de>
Cc: ietf-http-wg@w3.org
On Sun, Jan 15, 2012 at 11:21 AM, Julian Reschke <julian.reschke@gmx.de> wrote:
> On 2012-01-13 13:29, Zhong Yu wrote:
>>
>> Suppose a GET request contains `If-None-Match` and `Range` headers;
>> the If-None-Match condition fails, the Range is unsatisfiable. Which
>> code should be returned, 304 or 416? There are conflicting statements
>> in the draft:
>>
>> Part 4, section 3.2.
>>
>>    If the request would, without the If-None-Match header field, result
>>    in anything other than a 2xx or 304 status code, then the If-None-
>>    Match header field MUST be ignored.
>>
>> (that means 416 should be returned)
>>
>> Part 5, section 5.4.2.
>>
>>    o  The presence of a Range header field in a conditional GET (a
>>       request using one or both of If-Modified-Since and If-None-Match,
>>       or one or both of If-Unmodified-Since and If-Match) modifies what
>>       is returned if the GET is otherwise successful and the condition
>>       is true.  It does not affect the 304 (Not Modified) response
>>       returned if the conditional is false.
>>
>> (that means 304 should be returned)
>>
>> If the server decides that such a bad request is not worth honoring,
>> which error code should be returned to client?
>
>
> I don't think we know. Does it really matter?

Not really, except for a server implementation, which must yield a
result for any situation, so the question is what kind of results are
acceptable for this case. It's OK if the spec explicitly states that
such case is undefined; but my reading is that the draft contradicts
itself here.

(400 is apparently a legit response according to the new draft)

Zhong Yu

> (I think this is the same issue as
> <http://trac.tools.ietf.org/wg/httpbis/trac/ticket/241>)
>
> Best regards, Julian
>
Received on Monday, 16 January 2012 06:59:47 GMT

This archive was generated by hypermail 2.2.0+W3C-0.50 : Friday, 27 April 2012 06:51:52 GMT