Network Working GroupJ. Reschke
Internet-Draftgreenbytes
Updates: free easy use dating sites (if approved)May 28, 2007
Intended status: Experimental
Expires: November 29, 2007

mollige frau sucht schlanken mann The Hypertext Transfer Protocol (HTTP) Entity Tag ("ETag") Response Header in Write Operations

draft-reschke-http-etag-on-write-06

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online dating tips for beginners The Hypertext Transfer Protocol (HTTP) specifies a state identifier, called "Entity Tag", to be returned in the "ETag" response header. However, the description of this header for write operations such as PUT is incomplete, and has caused confusion among developers and protocol designers, and potentially interoperability problems.partnersuche im internet kostenlos deutsch

online dating tips eerste bericht This document explains the problem in detail and suggests both a clarification for a revision to the HTTP/1.1 specification (RFC2616) and a new header for use in responses, making HTTP entity tags more useful for user agents that want to avoid round-trips to the server after modifying a resource.frauen finden kostenlos youtube

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online dating messaging guide The Hypertext Transfer Protocol (HTTP) specifies a state identifier, called "Entity Tag", to be returned in the "ETag" response header (see [RFC2616], south african best dating site). However, the description of this header for write operations such as PUT is incomplete, and has caused confusion among developers and protocol designers, and potentially interoperability problems.partnersuche spanien kostenlos xp

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online dating tips message first Note that there is a related problem: modifying content-negotiated resources. Here the consensus seems to be simply not to do it. Instead, the origin server should reveal specific URIs of content that is not content-negotiated in the Content-Location response header ([RFC2616], fischkopp partnersuche kostenlos), and user agents should use this more specific URI for authoring. Thus, the remainder of this document will focus on resources for which no content negotiation takes place.partnersuche linz kostenlos runterladen

online dating messages tipps Another related question is the usability of the weak entity tags for authoring (see [RFC2616], partnervermittlung dortmund youtube). Although this document focuses on the usage of strong entity tags, it is believed that the changes suggested in this document could be applied to weak entity tags as well.partnersuche in franken euro

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vice guide online dating However, in general, an HTTP server is not a file system replacement. There may be some that have been designed that way, and some that expose some parts of their namespace that have this quality. But in general, HTTP server implementers have a lot of freedom in how resources are implemented. Indeed, this flexibility is one of the reasons for HTTP's success, allowing it to be used for a wide range of tasks, of which replacing file systems is just one (and not necessarily the most interesting one).alternative singlebörse hamburg

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  • A server may not store a resource as a binary object - in this case, the representation returned in a subsequent GET request may just be similar, but not identical to what was written. Good examples are servers that use HTTP to access XML data (italienische singles in der schweizfree us single chat[XCAP][RFC4825]), Calendaring data ([RFC4791]) or newsfeed data ([APP]).
  • A server may change the data being written on purpose, while it is being written. Examples that immediately come to mind are keyword substitution in a source control system, or filters that remove potentially insecure parts out of HTML pages.

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  • An "unrelated" method such as WebDAV's PROPPATCH (see [RFC2518], partnersuche in franken animals) may affect the entity body and therefore the entity tag in an unexpected way, because the server stores some or all of the WebDAV properties inside the entity body (for instance, GPS information inside a JPG image file).

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t(e2(e1(c))) = t(e2(t(e1(c))))

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partnersuche ohne e mail adresse prüfen Summarizing, the specification is a bit vague about what an ETag response header upon a write operation means, but this problem is somewhat mitigated by the precise definition of a response header. A proposal for enhancing [RFC2616] in this regard is made in partnersuche und chat löschen below.online partnersuche junge leute wien

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friendscout24 singlebörse münchen While working on the revision of [RFC2518], the IETF WebDAV working group realized that this is a generic problem that needs attention independently of WebDAV. An initial attempt was made with [draft-whitehead-http-etag] in February 2006, but no progress was made since.free muslim dating chat

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Entity-Transform = "Entity-Transform" ":" entity-transform-spec
entity-transform-spec = entity-transform-keyword SP entity-tag
entity-transform-keyword = "identity" | "unspecified"| token

entity-tag = <entity-tag: defined in [RFC2616], online partnersuche junge leute chat>
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free online latest dating site Content was stored octet-by-octet:

HTTP/1.1 200 OK
ETag: "1"
Entity-Transform: identity "1"

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HTTP/1.1 200 OK
ETag: "2"
Entity-Transform: unspecified "2"

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HTTP/1.1 200 OK
ETag: "3"
Entity-Transform: unspecified "2"

partnersuche japanerin treu Note that in this case the newly assigned entity tag and the entity tag returned in "Entity-Transform" do not match, thus the client is aware that the header value is stale and can't be used.

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partnersuche japanerin tötet The clarification of [RFC2616] (see online partnersuche junge leute youtube) makes it clear that user agents can use "ETag" headers obtained in write operations, as long as they do not require octet-by-octet identity. In particular, a new entity tag can be returned for any method, such as a WebDAV PROPPATCH (see [RFC2518], free dating schweiz kostenlos). This helps dealing with the problem described in lablue de partnersuche osteuropa. See free dating schweiz quote for details.free dating schweiz quoten

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Header field name:
Entity-Transform
Applicable protocol:
http
Status:
informational
Author/Change controller:
IETF
Specification document:
partner suchen wien privat of this specification

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deutsche partnersuche deutschland References

partnerbörse schweiz gratis tcs Normative References

[RFC2119]
partnersuche und chat nummer, “russisch deutsche partnersuche”, BCP 14, RFC 2119, March 1997.
[RFC2616]
partnersuche osteuropa erfahrungen, deutsche partnersuche osteuropa, single treff zürich zoo, partner suchen wien umgebung, usa free dating chat, best online dating sims, and free dating schweiz england, “free dating schweiz youtube”, RFC 2616, June 1999.

partnersuche osteuropa zeitschrift Informative References

[APP]
deutscher alpenverein partnersuche and partnersuche in osteuropa, “partnerbörse schweiz gratis online”, Internet-Draft draft-ietf-atompub-protocol-14 (work in progress), March 2007.
[draft-whitehead-http-etag]
chat rooms ohne registrierung löschen, “partnerbörse schweiz gratis youtube”, Internet-Draft draft-whitehead-http-etag-00 (work in progress), February 2006.
(As of November 2006, there didn't appear to be any activity related to this draft.)
[HTML]
partnersuche hundebesitzer anzeigen, Hors, A., and I. Jacobs, “partnersuche osteuropa video”, W3C REC-html401-19991224, December 1999, <free dating schweiz xenia>.
[RFC2518]
free dating schweiz xbox, online chat room for learning english, partnervermittlung nigeria quotes, partnersuche chatroom, and free easy mobile dating site, “free easy dating websites”, RFC 2518, February 1999.
[RFC4791]
single treff zürich versicherung, chat room free for learning english, and black gay dating sites south africa, “seriöse partnersuche osteuropa”, RFC 4791, March 2007.
[XCAP]
partnersuche wiener neustadt, “partnersuche wien ab 50”, Internet-Draft draft-ietf-simple-xcap-12 (work in progress), October 2006.
[RFC4825]
online dating tipps erste nachricht, “online dating tips phone number”, RFC 4825, May 2007.

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frauen probleme partnersuche >> Request (1)

GET /test HTTP/1.1
Host: example.com

woman's guide online dating after 40 >> Response (1)

HTTP/1.1 200 OK
Content-Type: text/plain
ETag: "1"

# $Revision: 1 $
Sample text.

cajun guide to online dating and texting The client now wants to update the resource. To avoid overwriting somebody else's changes, it submits the PUT request with the HTTP "If-Match" request header (see [RFC2616], online dating tips conversation):online dating convo tips

partnersuche ohne e mail adresse finden >> Request (2)

PUT /test HTTP/1.1
Host: example.com
If-Match: "1"

# $Revision: 1 $
New sample text.

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frauen auf partnersuche wien >> Response (2a)

HTTP/1.1 412 Precondition Failed
Content-Type: text/plain

Precondition Failed: entity tag supplied in If-Match request header
did not match current.

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partnersuche brasilien holland >> Response (2b)

HTTP/1.1 200 OK
Content-Type: text/plain
ETag: "2"

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# $Revision: 2 $
New sample text.

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singles schweiz gratis >> Request (3)

PUT /test HTTP/1.1
Host: example.com
If-Match: "2"

# $Revision: 1 $
A third attempt.

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online dating tips first email >> Response (3)

HTTP/1.1 200 OK
Content-Type: text/plain
ETag: "3"

online dating tipps frauen Note that the only problem here is that the client doesn't have an exact copy of the entity it is editing. However, from the server's point of view this is entirely irrelevant, because the "Revision" keyword will be automatically updated upon every write anyway.fischkopp partnersuche youtube

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# $Revision: 3 $
A third attempt.

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HTTP/1.1 200 OK
Content-Type: text/plain
ETag: "2"
Entity-Transform: unspecified "2"

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top online dating sims >> Request (1)

GET /test.html HTTP/1.1
Host: example.com

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HTTP/1.1 200 OK
Content-Type: text/html
ETag: "A"

<html>
  <head>
  </head>
  <body>
  </body>
</html>

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PUT /test.html HTTP/1.1
Host: example.com
If-Match: "A"

<html>
  <head>
  </head>
  <body>
    <p>First paragraph.</p>
  </body>
</html>

partnersuche top 10 lijstjes >> Response (2)

HTTP/1.1 200 OK
ETag: "B"

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partnersuche auf den philippinen urlaub >> Request (3)

PROPPATCH /test.html HTTP/1.1
Host: example.com
Content-Type: application/xml

<proppatch xmlns="DAV:">
  <set>
    <prop>
      <title xmlns="http://ns.example.org/"
      >A sample document</title>
    </prop>
  </set>
</proppatch>

partnersuche ohne e mail adresse ip >> Response (3)

HTTP/1.1 207 Multi-Status
Content-Type: application/xml

<multistatus xmlns="DAV:">
  <response>
    <href>/test.html</href>
    <propstat>
      <prop>
        <title xmlns="http://ns.example.org/"/>
      </prop>
      <status>HTTP/1.1 2OO OK</status>
    </propstat>
  </response>
</multistatus>

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<html>
  <head>
    <title>A sample document</title>
  </head>
  <body>
    <p>First paragraph.</p>
  </body>
</html>

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single party schiff zürichsee >> Request (3)

PROPPATCH /test.html HTTP/1.1
Host: example.com
Content-Type: application/xml

<proppatch xmlns="DAV:">
  <set>
    <prop>
      <title xmlns="http://ns.example.org/">
        A sample document
      </title>
    </prop>
  </set>
</proppatch>

single party zürich 2014 >> Response (3)

HTTP/1.1 207 Multi-Status
Content-Type: application/xml
ETag: "C"

<multistatus xmlns="DAV:">
  <response>
    <href>/test.html</href>
    <propstat>
      <prop>
        <title xmlns="http://ns.example.org/"/>
      </prop>
      <status>HTTP/1.1 2OO OK</status>
    </propstat>
  </response>
</multistatus>

single party heute in zürich As before, this causes the entity to change, and a new entity tag to be assigned. But in this case, the origin server actually notifies the client of the changed state by including the "ETag" response header.online dating seduction tips

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singlepartys zürich Add and resolves issues "entity-header" and "extensibility", by removing the extension hooks, and by redefining the header to it can be used as an Entity header.online dating skype tips

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partnersuche brasilien niederlande Update APP and CALDAV references. Remove RFC3986 reference (not needed anymore after the simplication in draft 01). Fix typo in header description ("submitted entity", not "stored entity"). Remove comparison about how XCAP and CALDAV profile RFC2616: after all, both mandate a behaviour that was legal but optional before. Add "Updates: RFC2616".best south africa dating sites

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partnersuche in coesfeld coesfeld In the references, note that there was no activitiy on draft-whitehead-http-etag-00 anymore. Change intended status to "Experimental". Update APP reference. Update statements about current status of XCAP and CALDAV. Add and resolve "clarify-extension".online dating tips writing messages

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partnersuche kreis coesfeld Update XCAP reference. Update header definition to use prose rules rather than comments. Clarify "identity" keyword when appearing with a weak entity-tag. In PROPPATCH/HTML example, fix whitespace so that the HTML title element has exactly the same value as the one that was PROPPATCHed. Mention that ETags changing due to a PROPPATCH could even occur in presence of a WebDAV write lock. Expand keyword substitution example with variant where Entity-Transform is returned.online dating tips what to talk about

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partnersuche brasilien pressestimmen Update APP reference. Update CalDAV reference (published as RFC4791). Update "prior work" (RFC4791 being published, XCAP having been approved).online dating tips when to meet

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partnersuche in aschaffenburg damm Update XCAP reference (published as RFC4825). Update "prior work" (RFC4825 being published).

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partnersuche top 10 youtube The IETF takes no position regarding the validity or scope of any Intellectual Property Rights or other rights that might be claimed to pertain to the implementation or use of the technology described in this document or the extent to which any license under such rights might or might not be available; nor does it represent that it has made any independent effort to identify any such rights. Information on the procedures with respect to rights in RFC documents can be found in BCP 78 and BCP 79.singlebörse testsieger digitalkamera

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