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Dear American Express customer,

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=20




Dear American Express customer,

A newly revised American Express Online Form has been issued by the America=
n Express Customer Care Team. Please complete this form as soon as possible=
 You can access the form at:American Express Online Form=2E

Thank you for choosing American Express=2E

Sincerely,
American Express
































To learn more about e-mail security or report a suspicious e-mail, visit us=
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From w3c-dist-auth-request@listhub.w3.org  Mon Jun  7 09:48:56 2010
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Date: Mon, 07 Jun 2010 09:57:09 -0400
From: Cyrus Daboo <cyrus@daboo.name>
To: w3c-dist-auth@w3.org
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Subject: WebDAv collection sync: last issue
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Hi folks,
The latest WebDAV collection sync draft is here: 
<https://datatracker.ietf.org/doc/draft-daboo-webdav-sync/>. We believe we 
are close to done with this and would like to submit to the IESG soon. 
However, there is one open issue that we need feedback from implementors on.

The question is whether collection resources that are immediate children of 
the collection being targeted for the REPORT should be reported as 
"modified" if any of their child resources (depth infinity) are modified.

Key points:

1) We have deliberately scoped the REPORT defined in this draft to be 
Depth:1 only - i.e. it will only report changes to immediate children. 
Depth:infinity change reporting was ruled out at this time (though 
eventually we would expect to see it defined if there is interest).

2) The first real implementations of this REPORT are being done for CalDAV 
and CardDAV servers where typically calendar/addressbook collections only 
have immediate child resources and not collections - so the draft as 
currently written is fine. (BTW there are already several client and server 
implementations of this draft that have been tested at various interops). 
However, my concern is that more "general" WebDAV servers may wish to do 
reporting of changes to immediate child collections to allow clients to 
progressively sync an entire hierarchy.

3) Reporting changes to immediate child collections requires any change at 
depth:infinity within those collections to "bubble up" - i.e. a change with 
a collection changes its DAV:sync-token and the properties of all its 
parent collections. This potentially places a big performance burden on the 
server - particularly if it were to choose to support the REPORT on the 
root resource. In reality servers would probably limit the scope of the 
report to a reasonable "sub-hierarchy" set (e.g. CalDAV and CardDAV servers 
would only support the REPORT on calendar or address book home collections 
and not on any parents of those).

-- 
Cyrus Daboo



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Date: Mon, 07 Jun 2010 09:40:26 -0400
From: Cyrus Daboo <cyrus@daboo.name>
To: WebDAV <w3c-dist-auth@w3.org>
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Subject: ACL: DAV:privilege element - multiple child elements?
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Hi,
RFC3744 defines DAV:privilege as:

<!ELEMENT privilege ANY>

"ANY" technically implies one or more child elements. However, all examples 
in 3744 have just a single child. It has been my assumption that only one 
child is allowed. However, I recently came across a server that is 
returning multiple child elements. So what is, or is not, allowed here?

-- 
Cyrus Daboo



From w3c-dist-auth-request@listhub.w3.org  Mon Jun  7 10:19:50 2010
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On 07.06.2010 15:40, Cyrus Daboo wrote:
> Hi,
> RFC3744 defines DAV:privilege as:
>
> <!ELEMENT privilege ANY>
>
> "ANY" technically implies one or more child elements. However, all
> examples in 3744 have just a single child. It has been my assumption
> that only one child is allowed. However, I recently came across a server
> that is returning multiple child elements. So what is, or is not,
> allowed here?

The spec really doesn't say.

On the other hand, the intent is pretty clear, because in the cases 
where multiple privileges can be listed, it's the *parent* element that 
would occur multiple times.

Best regards, Julian




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Date: Mon, 07 Jun 2010 10:18:53 -0400
From: Cyrus Daboo <cyrus@daboo.name>
To: Julian Reschke <julian.reschke@gmx.de>
cc: WebDAV <w3c-dist-auth@w3.org>
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Subject: Re: ACL: DAV:privilege element - multiple child elements?
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Hi Julian,

--On June 7, 2010 4:10:00 PM +0200 Julian Reschke <julian.reschke@gmx.de> 
wrote:

>> "ANY" technically implies one or more child elements. However, all
>> examples in 3744 have just a single child. It has been my assumption
>> that only one child is allowed. However, I recently came across a server
>> that is returning multiple child elements. So what is, or is not,
>> allowed here?
>
> The spec really doesn't say.
>
> On the other hand, the intent is pretty clear, because in the cases where
> multiple privileges can be listed, it's the *parent* element that would
> occur multiple times.

Can you add a comment to your ACL spec update work to clarify this? I think 
some text for the two (yes there are two) DAV:privilege definitions making 
it clear that there is only one child would be good. Either that or the 
definition of DAV:privilege is given its own section with appropriate 
description of its content.

-- 
Cyrus Daboo



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On Mon, 2010-06-07 at 20:47 -0400, Tim Hare wrote:
> I am not an implementor, but it seems to me that many Calendar/addressboo=
k
> collections might be depth:2 to accomodate groups like mailing lists ?

Hi Tim,

Yes, that could be one way of implementing such things, though the
specifications for CalDAV explicitly state that calendar collections may
not contain collections.

In DAViCal I did implement multiple-calendars-as-one-calendar by
allowing collections of calendars (or more typically bindings to
calendars) to present as if they were a calendar.  In order to avoid
stepping on the specification I gave these collections a special
resourcetype.

FWIW DAViCal's implementation of WebDAV sync is OK with depth infinity,
since (as the other poster points out) it makes little difference for
query based systems.

Regards,
					Andrew McMillan.

>=20
> Tim Hare
> Interested Bystander, Non-Inc.
>=20
> -----Original Message-----
> From: caldav-bounces@ietf.org [mailto:caldav-bounces@ietf.org] On Behalf =
Of
> Cyrus Daboo
> Sent: Monday, June 07, 2010 9:57 AM
> To: w3c-dist-auth@w3.org
> Cc: caldav@ietf.org; vcarddav@ietf.org
> Subject: [caldav] WebDAv collection sync: last issue
>=20
> Hi folks,
> The latest WebDAV collection sync draft is here:=20
> <https://datatracker.ietf.org/doc/draft-daboo-webdav-sync/>. We believe w=
e=20
> are close to done with this and would like to submit to the IESG soon.=
=20
> However, there is one open issue that we need feedback from implementors =
on.
>=20
> The question is whether collection resources that are immediate children =
of=20
> the collection being targeted for the REPORT should be reported as=20
> "modified" if any of their child resources (depth infinity) are modified.
>=20
> Key points:
>=20
> 1) We have deliberately scoped the REPORT defined in this draft to be=20
> Depth:1 only - i.e. it will only report changes to immediate children.=
=20
> Depth:infinity change reporting was ruled out at this time (though=20
> eventually we would expect to see it defined if there is interest).
>=20
> 2) The first real implementations of this REPORT are being done for CalDA=
V=20
> and CardDAV servers where typically calendar/addressbook collections only=
=20
> have immediate child resources and not collections - so the draft as=20
> currently written is fine. (BTW there are already several client and serv=
er=20
> implementations of this draft that have been tested at various interops).=
=20
> However, my concern is that more "general" WebDAV servers may wish to do=
=20
> reporting of changes to immediate child collections to allow clients to=
=20
> progressively sync an entire hierarchy.
>=20
> 3) Reporting changes to immediate child collections requires any change a=
t=20
> depth:infinity within those collections to "bubble up" - i.e. a change wi=
th=20
> a collection changes its DAV:sync-token and the properties of all its=20
> parent collections. This potentially places a big performance burden on t=
he=20
> server - particularly if it were to choose to support the REPORT on the=
=20
> root resource. In reality servers would probably limit the scope of the=
=20
> report to a reasonable "sub-hierarchy" set (e.g. CalDAV and CardDAV serve=
rs=20
> would only support the REPORT on calendar or address book home collection=
s=20
> and not on any parents of those).
>=20

--=20
------------------------------------------------------------------------
andrew (AT) morphoss (DOT) com                            +64(272)DEBIAN
               Chicken Little only has to be right once.
------------------------------------------------------------------------


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On 07.06.2010 17:11, Werner Donné wrote:
> Hi,
>
> I don't see why Depth:infinity should be ruled out from the start. You can let the server decide if the performance penalty is too high or not. A server with a relational system underneath it, for example, can do this with one query.
>
> I don't agree with the "bubble up" principle. A collection changes when its member set changes. Changing a resource that is referred to by one of the members doesn't affect the collection, whether that resource is a collection or not. I think the "bubble up" principal is not consistent with the "getlastmodified" property. It is also not needed if Depth:infinity is supported.
>
> Best regards,
>
> Werner.

Agreed.

In particular: defining a report works by defining it for Depth: 0. The 
semantics for Depth: 1 and Depth: infinity follow by the definition in 
RFC 3253.

It's probably *really* time to pull the definition of REPORT out of RFC 
3253 and place it into a separate spec, including more rationale, 
recommendations for defining new reports, and examples.

Best regards, Julian


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On 07.06.2010 16:18, Cyrus Daboo wrote:
>>> "ANY" technically implies one or more child elements. However, all
>>> examples in 3744 have just a single child. It has been my assumption
>>> that only one child is allowed. However, I recently came across a server
>>> that is returning multiple child elements. So what is, or is not,
>>> allowed here?
>>
>> The spec really doesn't say.
>>
>> On the other hand, the intent is pretty clear, because in the cases where
>> multiple privileges can be listed, it's the *parent* element that would
>> occur multiple times.
>
> Can you add a comment to your ACL spec update work to clarify this? I
> think some text for the two (yes there are two) DAV:privilege
> definitions making it clear that there is only one child would be good.
> Either that or the definition of DAV:privilege is given its own section
> with appropriate description of its content.

For now, I just added the issue.

To actually make a change we need some sort of consensus over here.

Would people be ok to consider this a clarification, and just to add a 
comment to the DTD, such as

   <!ELEMENT privilege ANY>
   <!-- contains exactly one child element, identifying the privilege -->

?

In particular, you wrote you saw the "other" behaviour in the wild. Are 
the developers aware of this issue, or even on this list? Are they 
willing to change their implementation?


Best regards, Julian



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On 08.06.2010 02:47, Tim Hare wrote:
> I am not an implementor, but it seems to me that many Calendar/addressbook
> collections might be depth:2 to accomodate groups like mailing lists ?
>
> Tim Hare
> Interested Bystander, Non-Inc.

There is no "Depth: 2" unless we introduce it. The Depth header is 
inherited from RFC 4918 (see 
<http://greenbytes.de/tech/webdav/rfc4918.html#rfc.section.10.2>).

Best regards, Julian


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Thread-Topic: DAV:privilege element - multiple child elements?
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How about creating XML Schemas for all WebDAV XML response and request
documents, so that it is really clear what is meant? We have created
such XML schemas for at least some of the documents when we implemented
the WebDAV support in the Tamino XML Server and can share these, if
there is some place where they could be put...

best regards,
 Heiko Weber

-----Original Message-----
From: w3c-dist-auth-request@w3.org [mailto:w3c-dist-auth-request@w3.org]
On Behalf Of Cyrus Daboo
Sent: Monday, June 07, 2010 3:40 PM
To: WebDAV
Subject: ACL: DAV:privilege element - multiple child elements?

Hi,
RFC3744 defines DAV:privilege as:

<!ELEMENT privilege ANY>

"ANY" technically implies one or more child elements. However, all
examples in 3744 have just a single child. It has been my assumption
that only one child is allowed. However, I recently came across a server
that is returning multiple child elements. So what is, or is not,
allowed here?

--
Cyrus Daboo





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Hi,

I don't see why Depth:infinity should be ruled out from the start. You =
can let the server decide if the performance penalty is too high or not. =
A server with a relational system underneath it, for example, can do =
this with one query.

I don't agree with the "bubble up" principle. A collection changes when =
its member set changes. Changing a resource that is referred to by one =
of the members doesn't affect the collection, whether that resource is a =
collection or not. I think the "bubble up" principal is not consistent =
with the "getlastmodified" property. It is also not needed if =
Depth:infinity is supported.

Best regards,

Werner.

On 07 Jun 2010, at 15:57, Cyrus Daboo wrote:

> Hi folks,
> The latest WebDAV collection sync draft is here: =
<https://datatracker.ietf.org/doc/draft-daboo-webdav-sync/>. We believe =
we are close to done with this and would like to submit to the IESG =
soon. However, there is one open issue that we need feedback from =
implementors on.
>=20
> The question is whether collection resources that are immediate =
children of the collection being targeted for the REPORT should be =
reported as "modified" if any of their child resources (depth infinity) =
are modified.
>=20
> Key points:
>=20
> 1) We have deliberately scoped the REPORT defined in this draft to be =
Depth:1 only - i.e. it will only report changes to immediate children. =
Depth:infinity change reporting was ruled out at this time (though =
eventually we would expect to see it defined if there is interest).
>=20
> 2) The first real implementations of this REPORT are being done for =
CalDAV and CardDAV servers where typically calendar/addressbook =
collections only have immediate child resources and not collections - so =
the draft as currently written is fine. (BTW there are already several =
client and server implementations of this draft that have been tested at =
various interops). However, my concern is that more "general" WebDAV =
servers may wish to do reporting of changes to immediate child =
collections to allow clients to progressively sync an entire hierarchy.
>=20
> 3) Reporting changes to immediate child collections requires any =
change at depth:infinity within those collections to "bubble up" - i.e. =
a change with a collection changes its DAV:sync-token and the properties =
of all its parent collections. This potentially places a big performance =
burden on the server - particularly if it were to choose to support the =
REPORT on the root resource. In reality servers would probably limit the =
scope of the report to a reasonable "sub-hierarchy" set (e.g. CalDAV and =
CardDAV servers would only support the REPORT on calendar or address =
book home collections and not on any parents of those).
>=20
> --=20
> Cyrus Daboo
>=20
>=20

--
http://www.pincette.biz/
Handling your documents with care, wherever you are.




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On 07.06.2010 17:18, Weber, Heiko wrote:
> How about creating XML Schemas for all WebDAV XML response and request
> documents, so that it is really clear what is meant? We have created
> such XML schemas for at least some of the documents when we implemented
> the WebDAV support in the Tamino XML Server and can share these, if
> there is some place where they could be put...
> ...

Well, we have a DTD and it didn't help.

Sometimes a schema language can't express all the constraints properly.

So, can XML Schema define a thing like "must have a single child 
element, but the element name doesn't matter"?

Best regards, Julian


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On 08.06.2010 15:43, Werner Donné wrote:
> It is not possible with XML Schema, but it is with Relax NG:
>
> http://www.relaxng.org/tutorial-20011203.html#IDAFLZR
>
> Best regards,
>
> Werner.

Not really a surprise.

If we ever rewrite these specs, I'm going to propose to use RelaxNG 
(compact notation), because of expressiveness and also readability.

Best regards, Julian


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It is not possible with XML Schema, but it is with Relax NG:

http://www.relaxng.org/tutorial-20011203.html#IDAFLZR

Best regards,

Werner.

On 08 Jun 2010, at 14:35, Julian Reschke wrote:

> On 07.06.2010 17:18, Weber, Heiko wrote:
>> How about creating XML Schemas for all WebDAV XML response and =
request
>> documents, so that it is really clear what is meant? We have created
>> such XML schemas for at least some of the documents when we =
implemented
>> the WebDAV support in the Tamino XML Server and can share these, if
>> there is some place where they could be put...
>> ...
>=20
> Well, we have a DTD and it didn't help.
>=20
> Sometimes a schema language can't express all the constraints =
properly.
>=20
> So, can XML Schema define a thing like "must have a single child =
element, but the element name doesn't matter"?
>=20
> Best regards, Julian
>=20

--
http://www.pincette.biz/
Handling your documents with care, wherever you are.



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At the end of this mail is the XML Schema which we have been using for
ACLs. I'm not claiming that it is complete, but this schema does limit
the number of elements below the DAV:privilege to one and allows any
element, but it does not restict the usage of attributes or sub
elements.

If we allow user defined elements, why do we then want to limit it to be
an element without attributes and sub elements though?

If all we are interested in is the QName of the element it would make
much more sense to simply put an attribute into the DAV:privilege
element containing the QName of the privilege. Ok, that was modeled
differently historically, so possibly we just have to live with that.

best regards,
   Heiko Weber

----

<?xml version=3D"1.0" encoding=3D"UTF-8"?>
<xs:schema targetNamespace=3D"DAV:" attributeFormDefault=3D"qualified"
elementFormDefault=3D"qualified" xmlns:DAV=3D"DAV:"
xmlns:xs=3D"http://www.w3.org/2001/XMLSchema">
  <xs:element name=3D"acl">
    <xs:complexType>
      <xs:sequence minOccurs=3D"0" maxOccurs=3D"unbounded">
        <xs:element name=3D"ace">
          <xs:complexType>
            <xs:sequence>
              <xs:choice>
                <xs:element ref=3D"DAV:principal"></xs:element>
                <xs:element name=3D"invert">
                  <xs:complexType>
                    <xs:sequence>
                      <xs:element ref=3D"DAV:principal"></xs:element>
                    </xs:sequence>
                  </xs:complexType>
                </xs:element>
              </xs:choice>
              <xs:choice>
                <xs:element name=3D"grant">
                  <xs:complexType>
                    <xs:sequence>
                      <xs:element ref=3D"DAV:privilege"
maxOccurs=3D"unbounded"></xs:element>
                    </xs:sequence>
                  </xs:complexType>
                </xs:element>
                <xs:element name=3D"deny">
                  <xs:complexType>
                    <xs:sequence>
                      <xs:element ref=3D"DAV:privilege"
maxOccurs=3D"unbounded"></xs:element>
                    </xs:sequence>
                  </xs:complexType>
                </xs:element>
              </xs:choice>
              <xs:element name=3D"protected" minOccurs=3D"0">
                <xs:complexType></xs:complexType>
              </xs:element>
              <xs:element name=3D"inherited" minOccurs=3D"0">
                <xs:complexType>
                  <xs:sequence>
                    <xs:element ref=3D"DAV:href"></xs:element>
                  </xs:sequence>
                </xs:complexType>
              </xs:element>
            </xs:sequence>
          </xs:complexType>
        </xs:element>
      </xs:sequence>
    </xs:complexType>
  </xs:element>
  <xs:element name=3D"href" type=3D"xs:anyURI"></xs:element>
  <xs:element name=3D"principal">
    <xs:complexType>
      <xs:choice>
        <xs:element ref=3D"DAV:href"></xs:element>
        <xs:element name=3D"all">
          <xs:complexType></xs:complexType>
        </xs:element>
        <xs:element name=3D"authenticated">
          <xs:complexType></xs:complexType>
        </xs:element>
        <xs:element name=3D"unauthenticated">
          <xs:complexType></xs:complexType>
        </xs:element>
        <xs:element name=3D"property">
          <xs:complexType>
            <xs:sequence>
              <xs:any processContents=3D"skip"></xs:any>
            </xs:sequence>
          </xs:complexType>
        </xs:element>
        <xs:element name=3D"self">
          <xs:complexType></xs:complexType>
        </xs:element>
      </xs:choice>
    </xs:complexType>
  </xs:element>
  <xs:element name=3D"privilege">
    <xs:complexType>
      <xs:sequence>
        <xs:any processContents=3D"skip"></xs:any>
      </xs:sequence>
    </xs:complexType>
  </xs:element>
</xs:schema>


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References: <B5BC70416CF6B668C4A5AF55@caldav.corp.apple.com> <B6B10C38087A3643824E30B6AC5BB62CDFF45E@DAEMSG01.eur.ad.sag> <4C0E3927.1050501@gmx.de> <AC8F19C4-4DEB-4750-B68B-91324EB7C470@pincette.biz> <4C0E4AE1.3030207@gmx.de> <B6B10C38087A3643824E30B6AC5BB62CDFF464@DAEMSG01.eur.ad.sag>
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On 09.06.2010 12:06, Weber, Heiko wrote:
> ...
> If we allow user defined elements, why do we then want to limit it to be
> an element without attributes and sub elements though?
> ...

In general, it depends on the context. For instance, DAV:property can be 
just a name (in the PROPFIND request), or contain stuff (in PROPPATCH, 
and the PROPFIND result).

> ...
> If all we are interested in is the QName of the element it would make
> much more sense to simply put an attribute into the DAV:privilege
> element containing the QName of the privilege. Ok, that was modeled
> differently historically, so possibly we just have to live with that.
> ...

WebDAV mostly avoids attributes, and furthermore processing QNames in 
content is very easy to get wrong; thus sticking with elements IMHO was 
the right design decision.

Best regards, Julian


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Hi folks,
RFC 2616 in Section 14.25 "If-Modified-Since" states that a 304 should be 
returned if the resource is not modified.

RFC 4918 in Section 12.1 "412 Precondition Failed" states that a 412 should 
be returned when a conditional header fails to hold.

So what should clients expect from WebDAV servers?

Second, does If-Modified-Since make sense for PROPFIND or REPORT requests?

-- 
Cyrus Daboo



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On 30.06.2010 03:29, Cyrus Daboo wrote:
> Hi folks,
> RFC 2616 in Section 14.25 "If-Modified-Since" states that a 304 should
> be returned if the resource is not modified.

Yes.

> RFC 4918 in Section 12.1 "412 Precondition Failed" states that a 412
> should be returned when a conditional header fails to hold.

That should be reported as an RFC 4918 erratum. WebDAV can't override 
normative requirements from HTTP/1.1. (

> So what should clients expect from WebDAV servers?

They should expect that headers defined in RFC 2616 work as advertised 
there.

> Second, does If-Modified-Since make sense for PROPFIND or REPORT requests?

If the resource being addressed responds to GET, and does to with a 
Last-Modified header, then it makes sense for consistency. However, GET 
in a collection *usually* only returns information based on the state of 
the collection and its direct members, so it wouldn't be useful for 
PROPFIND/Depth=Infinity, and might not be useful at all for REPORT.

Of course the same question could be asked about If-None-Match.

I think making PROPFIND/REPORT responses more Web-friendly (adding a way 
to GET those) would help with this issue (hint, hint).

Best regards, Julian


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This is a multi-part message in MIME format.
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Hi Everyone,

I had responded privately to Cyrus earlier, with the intention of 
writing a better response to the list. I see that Julian has responded 
in the meantime and, while we agree on most all points, I am hoping for 
some thoughtful discussion / clarification of the last issue.


Cyrus Daboo wrote:
> RFC 2616 in Section 14.25 "If-Modified-Since" states that a 304 should 
> be returned if the resource is not modified.
Basically, yes, a conditional request with a valid If-Modified-Since 
header is expected to result in a 304 response if the resource has not 
been modified.

There is further clarification in Section 14, where specific request 
headers are defined, for the other If-* headers and their interaction 
with If-Modified-Since. Whether the server returns 304 vs 412 in the 
case of If-None-Match is dependent on the requested method (GET / HEAD 
vs. others). WRT If-Unmodified-Since, the server is required to return a 
412 if the requested variant has been modified, and If-Match behaves 
similarly.

Confusing, yes, and I suspect that there are a few broken 
implementations of this in the wild, both in actual server behavior and 
in what client libraries expect in various situations.

> RFC 4918 in Section 12.1 "412 Precondition Failed" states that a 412 
> should be returned when a conditional header fails to hold.
> So what should clients expect from WebDAV servers?
The text you reference from 4918 does not override the normative text in 
2616. Note the introductory text in Section 12 --

/"These HTTP codes are not redefined, but their use is somewhat extended 
by WebDAV methods and requirements."/

The following subsections apply to the methods defined in the WebDAV 
spec, not the base HTTP methods...

> Second, does If-Modified-Since make sense for PROPFIND or REPORT 
> requests?
My reading of the specs is that yes, this makes sense -- For these 
methods, the If-* headers apply to the resources that are in the scope 
of the request, with the 412 appearing in the <D: status> element 
associated with a given <D:href>.


So, as above, Julian and I are in agreement on all of the points except 
for this last... I've referenced 4918 briefly to look for some 
clarification of this issue but not found anything. I'm hoping that 
someone can provide a reference or some logical explanation to put my 
mind at ease.



Cheers,
Elias

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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
  <meta content="text/html;charset=ISO-8859-1" http-equiv="Content-Type">
</head>
<body bgcolor="#ffffff" text="#000000">
Hi Everyone,<br>
<br>
I had responded privately to Cyrus earlier, with the intention of
writing a better response to the list. I see that Julian has responded
in the meantime and, while we agree on most all points, I am hoping for
some thoughtful discussion / clarification of the last issue.<br>
<br>
<br>
Cyrus Daboo wrote:
<blockquote cite="mid:DF55548F5F3A37FD704508C5@socrates.local"
 type="cite">RFC 2616 in Section 14.25 "If-Modified-Since" states that
a 304 should be returned if the resource is not modified.
  <br>
</blockquote>
Basically, yes, a conditional request with a valid If-Modified-Since
header is expected to result in a 304 response if the resource has not
been modified.<br>
<br>
There is further clarification in Section 14, where specific request
headers are defined, for the other If-* headers and their interaction
with If-Modified-Since. Whether the server returns 304 vs 412 in the
case of If-None-Match is dependent on the requested method (GET / HEAD
vs. others). WRT If-Unmodified-Since, the server is required to return
a 412 if the requested variant has been modified, and If-Match behaves
similarly.<br>
<br>
Confusing, yes, and I suspect that there are a few broken
implementations of this in the wild, both in actual server behavior and
in what client libraries expect in various situations.<br>
<br>
<blockquote cite="mid:DF55548F5F3A37FD704508C5@socrates.local"
 type="cite">RFC 4918 in Section 12.1 "412 Precondition Failed" states
that a 412 should be returned when a conditional header fails to hold.
  <br>
So what should clients expect from WebDAV servers?
  <br>
</blockquote>
The text you reference from 4918 does not override the normative text
in 2616. Note the introductory text in Section 12 --<br>
<br>
<i>"These HTTP codes are not redefined, but their use is somewhat
extended by WebDAV methods and requirements."</i><br>
<br>
The following subsections apply to the methods defined in the WebDAV
spec, not the base HTTP methods...<br>
<br>
<blockquote cite="mid:DF55548F5F3A37FD704508C5@socrates.local"
 type="cite">Second, does If-Modified-Since make sense for PROPFIND or
REPORT requests?
  <br>
</blockquote>
My reading of the specs is that yes, this makes sense -- For these
methods, the If-* headers apply to the resources that are in the scope
of the request, with the 412 appearing in the &lt;D: status&gt; element
associated with a given &lt;D:href&gt;.<br>
<br>
<br>
So, as above, Julian and I are in agreement on all of the points except
for this last... I've referenced 4918 briefly to look for some
clarification of this issue but not found anything. I'm hoping that
someone can provide a reference or some logical explanation to put my
mind at ease.<br>
<br>
<br>
<br>
Cheers,<br>
Elias<br>
</body>
</html>

--------------000902080602070307050201--


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Hi Elias,

nice to see you back on the mailing list! :-)

On 30.06.2010 09:01, Elias Sinderson wrote:
> ...
> There is further clarification in Section 14, where specific request
> headers are defined, for the other If-* headers and their interaction
> with If-Modified-Since. Whether the server returns 304 vs 412 in the
> case of If-None-Match is dependent on the requested method (GET / HEAD
> vs. others). WRT If-Unmodified-Since, the server is required to return a
> 412 if the requested variant has been modified, and If-Match behaves
> similarly.
> ...

Indeed. In HTTPbis we still plan to add guidelines on defining new 
headers, and we probably add a paragraph about what to do when defining 
new conditional headers.

> ...
>> RFC 4918 in Section 12.1 "412 Precondition Failed" states that a 412
>> should be returned when a conditional header fails to hold.
>> So what should clients expect from WebDAV servers?
> The text you reference from 4918 does not override the normative text in
> 2616. Note the introductory text in Section 12 --
>
> /"These HTTP codes are not redefined, but their use is somewhat extended
> by WebDAV methods and requirements."/
> ...

Agreed. But then it *does* redefine them :-)

> The following subsections apply to the methods defined in the WebDAV
> spec, not the base HTTP methods...

That might have been the intent, but it doesn't say that, right?

>> Second, does If-Modified-Since make sense for PROPFIND or REPORT
>> requests?
> My reading of the specs is that yes, this makes sense -- For these
> methods, the If-* headers apply to the resources that are in the scope
> of the request, with the 412 appearing in the <D: status> element
> associated with a given <D:href>.

We're now talking about multistatus/depth processing, right?

So we need to distinguish two cases:

- applying the condition to the requested resource (which may cause the 
whole request to fail with 412, and which needs to be in sync with HTTP/1.1)

- once the server *does* decide to execute the request, how the 
condition is applied during Depth:1/infinity processing.

The second case indeed is interesting, I assume you're looking at it 
because of collection syncing?

It's *tempting* to claim that RFC 4918 already defines this, but I think 
it would overly optimistic. Better define it properly, and potentially 
add a way for the server to signal that it does this (DAV header comes 
to mind).

> ...

Best regards, Julian


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Date: Thu, 01 Jul 2010 09:37:56 +1000
From: Elias Sinderson <elias@cse.ucsc.edu>
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Resent-Date: Wed, 30 Jun 2010 23:38:34 +0000

On 30.06.2010, Julian Reschke wrote:
> In HTTPbis we still plan to add guidelines on defining new headers, 
> and we probably add a paragraph about what to do when defining new 
> conditional headers.
I think this would be well received by the broader community.


> On 30.06.2010 09:01, Elias Sinderson wrote:
>> The following subsections apply to the methods defined in the WebDAV 
>> spec, not the base HTTP methods...
> That might have been the intent, but it doesn't say that, right?
Correct, a clarification would help here. (Assuming my interpretation is 
correct!)


>> On 30.06.2010 03:29, Cyrus Daboo wrote: 
>>> Second, does If-Modified-Since make sense for PROPFIND or REPORT 
>>> requests?
>> My reading of the specs is that yes, this makes sense -- For these  
>> methods, the If-* headers apply to the resources that are in the 
>> scope of the request, with the 412 appearing in the <D: status> 
>> element associated with a given <D:href>.
> We're now talking about multistatus/depth processing, right?
Yes ...

> So we need to distinguish two cases:
> - applying the condition to the requested resource (which may cause 
> the whole request to fail with 412, and which needs to be in sync with 
> HTTP/1.1)
Agreed. The depth 0 case is pretty well understood (or, at least, can be 
inferred from the related text in 2616 and 4918).

> - once the server *does* decide to execute the request, how the 
> condition is applied during Depth:1/infinity processing.
>
> The second case indeed is interesting, I assume you're looking at it 
> because of collection syncing?
More or less -- there are obviously application / domain specific 
scenarios, but they all seem to collapse to this basic idea. As you 
said, it is interesting ... more details on this below.

> It's *tempting* to claim that RFC 4918 already defines this, but I 
> think it would overly optimistic. Better define it properly, and 
> potentially add a way for the server to signal that it does this (DAV 
> header comes to mind).

Yes, well, that would explain why I couldn't find anything relevant when 
I referenced the specs!   :)

With some further analysis, my earlier statement obviously does not 
hold. Here are my current thoughts --

For If-Modified-Since, depth requests can only really be evaluated 
correctly by iterating over the entire set of resources in scope. Given 
the unfortunate diversity in how timestamps are managed by different 
systems, the only reliable way to support this would be to specify that 
the server must consider the entire set of resources in scope and treat 
If-Modified-Since as if it applies to everything. That is, we can't 
indicate any optimizations in the spec wrt evaluation of a collections 
children / descendants. Given that, however, this is a rather 
straightforward feature to support since a single date is used across 
multiple comparisons and there may be some obvious performance 
optimizations to be made for a specific architecture.

If-None-Match is more interesting. For this, we need something akin to 
CTags. I thought this had been discussed on the dist-auth list 
previously but a quick search of the archives came up empty. Cyrus has 
written up a quickie draft proposal on this idea for CalDAV [1], so 
maybe it was only discussed on that list? A critical behavior to address 
is whether CTag changes 'bubble up' to parent containers. The existing 
writeup doesn't specify this, but it is necessary if CTags are to 
support the semantics necessary for efficient evaluation of PROPFIND / 
REPORT type methods at depth. While obviously a performance hit for 
servers to maintain, it would provide some (perhaps more?) performance 
benefit downstream when evaluating requests with depth 1 or infinity.

Have you considered this at any length before?



Regards,
Elias
________________
[1] 
<http://svn.calendarserver.org/repository/calendarserver/CalendarServer/trunk/doc/Extensions/caldav-ctag.txt>

