Network Working GroupJ. Reschke
Internet-Draftgreenbytes
Intended status: InformationalAugust 24, 2006
Expires: February 25, 2007

senioren singlebörse münchen The Hypertext Transfer Protocol (HTTP) Entity Tag ("ETag") Response Header in Write Operations

draft-reschke-http-etag-on-write-01

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albanische frau zum heiraten By submitting this Internet-Draft, each author represents that any applicable patent or other IPR claims of which he or she is aware have been or will be disclosed, and any of which he or she becomes aware will be disclosed, in accordance with Section 6 of BCP 79.partnervermittlung portugal qualifikation

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warum manche keinen partner finden The list of current Internet-Drafts can be accessed at russische frauen online kennenlernen.making a good online dating profile

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singleseiten kostenlos xp 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.gratis partnersuche bern

fischkopf partnerbörse zoosk 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 beste gratis partnersuchepartnersuche gratis kostenlosresponse headerheader 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.partnersuche fuer behinderte youtuber

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single seiten die kostenlos sind The Hypertext Transfer Protocol (HTTP) specifies a state identifier, called "Entity Tag", to be returned in the "ETag" response header (see [RFC2616], partnersuche meinestadt de routenplaner). 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 meinestadt de remscheid

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singlebörse augsburg qis 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], polnische singlebörse 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.wo finde ich einen christlichen partner

singleseiten für alleinerziehende kostenlos Another related question is the usability of the weak entity tags for authoring (see [RFC2616], free chat site like chatroulette). 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 kostenlos ab 15 raus

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singleseiten kostenlos runterladen However, at some point of time, potentially during a Web Distributed Authoring and Versioning (WebDAV, [RFC2518]) interoperability event, client programmers asked servers to always return "ETag" headers upon PUT, never ever to change the entity tag without "good reason", and - by the way - always to guarantee that the server stores the new content octet-by-octet.make online dating profile better

partnervermittlung julia quinn From the perspective of client software that wants to treat an HTTP server as a file system replacement, this makes a lot of sense. After all, when one writes to a file one usually expects the file system to store what was written, and not to unexpectedly change the contents.russische frauen kennenlernen mit fotos

partnervermittlung russische frau suchen 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 to be used for a wide range of tasks, of which replacing file systems is just one (and not necessarily the most interesting one).russische frauen in münchen kennenlernen

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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 ([XCAP]), Calendaring data ([CALDAV]) or newsfeed data ([APP]).
  • A server may change the data being written on purpose, while it's 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], suche schwangere frau zum heiraten) 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))))

partnersuche kostenlos in berlin heute e.g., it's irrelevant whether the client obtained the current entity body before doing its second edit.

singleseiten kostenlos test polnische single frauen kostenlos kennenlernen [katholische singlereisen: Question: does anybody know a real-world example for server-side content rewriting where the above is not true? [email protected]] partnervermittlung albanien portugal

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singlebörse schweiz ohne anmeldung Entity bodies (and thus entity tags) changing due to side effects of seemingly unrelated requests are indeed a problem, as demonstrated in wo finde ich den partner fürs leben, and this specification proposes a way to resolve this in katholische singles dresden.flirtomatic free online flirting chat

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singlebörse schweiz ohne registrierung There are several places in the HTTP/1.1 specification ([RFC2616]) mentioning the "ETag" response header.wo finde ich ein partner

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partnersuche kostenlos in berlin machen 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 singlebörse ostfriesland veranstaltungen below.online dating profile delete

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free web chats like chatroulette 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.partnervermittlung für landwirte .ch

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preisvergleich singlebörsen schweiz Note that of the two specifications above, [XCAP] profiles [RFC2616] in that it makes a previously optional behavior required, while [CALDAV] explicitly forbids a behavior which was previously allowed.partnerbörse testsieger digitalkamera

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2006-08-24Resolution: Redefine the header so that it can indeed be used as an Entity header.
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partnersuche in ukraine nachrichten The "Entity-Transform" response header can be used by the origin server in responses to any request that affects the entity body of a resource. It specifies partnersuche deutschland kostenlos schauenfeuerflamme christliche partnersuche dein which way the server has modified the entity before storage,whether or not the server has modified the entity before storage thus allowing the user agent to decide about whether it needs to refresh a local copy.

Entity-Transform    = "Entity-Transform" ":" feuerflamme christliche partnersuche deutschlandpartnerbörse test stiftung warentestalternative partnerbörse ungarn1#transform-info
transform-info      = "identity" | "unspecified" | token | coded-URI 
coded-URI           = "<" absolute-URI ">"
; token: [RFC2616], free date chat room
; absolute-URI: [RFC3986], free date chat site"identity" | "unspecified"

test online partnersuche A transform-info of "identity" specifies that the origin server has stored the entity octet-by-octet, thus the user agent MAY use a local copy for subsequent requests that rely on octet-by-octet identity (such as a PUT with "Range" request header).free date chat linesfeuerflamme christliche partnersuche wienpartnersuche im wallis Servers MUST NOT return "identity" with any other transform-info values.

singlebörsen schweiz test Both the absence of this response header and any value other than "identity" specify that the origin server may have transformed the entity before storage, thus a subsequent retrieval will not necessarily return an exact copy of the stored entity.

free chat rooms like chatroulette Future IETF specifications may define other token values for more precise information about how the content was rewritten. Values taking the form of a coded-URI can be defined without registration; in this case, it is RECOMMENDED to choose a URI that allows retrieval of a human-readable description.

gratis dating voor senioren See [RFC2616], partnervermittlung behinderte berlin for a definition of "response header".

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gratis dating sites senioren Content was stored octet-by-octet:

Entity-Transform: identity

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Entity-Transform: unspecified

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Entity-Transform: <http://example.org/transformations/xml>

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free online avatar chat games The 'Entity-Transform' entity header provides information about whether a transformation has been applied to an entity body.

free dating sites singlesnet When used in an HTTP request, its meaning is undefined. In an HTTP response, it provides information whether the server has applied a transformation when the entity was stored last.

free online chat room with no registration In general, entity headers may be stored in intermediates. The main use of this header however applies to the HTTP PUT method, of which by default the results are not cacheable (see [RFC2616], free chat websites like chatroulette). In addition, the value format is defined so that a client can reliably detect whether the information is fresh.

free chat room without registration chat dude Format:

Entity-Transform = "Entity-Transform" ":" entity-transform-spec
entity-transform-spec = entity-transform-keyword SP entity-tag
entity-transform-keyword = "identity" | "unspecified"
; entity-tag: defined in [RFC2616], free chat sites like chatroulette

south african chat rooms The entity-tag specifies the entity body to which this information applies.

south african chat rooms mobile An entity-transform-keyword of "identity" specifies that the origin server has stored the entity octet-by-octet, thus the user agent MAY use a local copy of the entity body with the given entity-tag for subsequent requests that rely on octet-by-octet identity (such as a PUT with "Range" request header).

free online south african chat rooms Both the absence of this response header and any entity-transform-keyword value other than "identity" specify that the origin server may have transformed the entity before storage, thus a subsequent retrieval will not necessarily return an exact copy of the stored entity.

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south african chat rooms yahoo Content was stored octet-by-octet:

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

ich finde meinen partner nicht attraktiv Content was transformed:

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

ich finde meinen partner nicht mehr attraktiv Response containing a stale "Entity-Transform" header:

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

www.julia partnervermittlung.de 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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schweizer singlebörsen im test The clarification of [RFC2616] (see partnersuche online kostenlos ohne anmeldung ipad) 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], finde ich meinen partner attraktiv. This helps dealing with the problem described in partnervermittlung frauen kostenlos chip. See julie gmbh partnervermittlung for details.partnervermittlung frauen kostenlos youtube

free dating websites for marriage The addition of the "Entity-Transform" partnervermittlung frauen kostenlos runterladenpartnersuche online kostenlos ohne anmeldung xppartnersuche online kostenlos ohne anmeldung xingresponse header (see partnersuche online kostenlos ohne anmeldung online) enables origin servers to signal that they stored an exact copy of the content, thus allowing clients not to refetch the content. Note that by default (in absence of the response header), a client can not make any assumptions about the server's behavior in this regard. Thus clients will only benefit from new servers explicitly setting the new header.katholische partnersuche profil löschen

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Header field name:
Entity-Transform
Applicable protocol:
http
Status:
informational
Author/Change controller:
IETF
Specification document:
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partnervermittlung julia linz References

katholische partnersuche at Normative References

[RFC2119]
partnersuche online kostenlos ohne anmeldung legal, “partnersuche online kostenlos ohne anmeldung lernen”, BCP 14, RFC 2119, March 1997.
[RFC2616]
pakistani chat room mix chat, wie finde ich neue partner für strukturvertrieb, wie finde ich am besten einen neuen partner, partnervermittlung vera nrw, gratis senioren dating site, gratis datingsites voor senioren, and partnervermittlung vera wang, “100 free flirt chat”, RFC 2616, June 1999.
[RFC3986]
calories in international delight hazelnut creamer singles, free dating sites singles, and secret partnersuche deutschland, “singlebörsen kostenlos test chip”, STD 66, RFC 3986, January 2005.

partnersuche online kostenlos ohne anmeldung wimmelbild Informative References

[APP]
partnersuche online kostenlos ohne anmeldung windows and julia partnervermittlung rostock, “partnersuche in sachsen kostenlos”, Internet-Draft draft-ietf-atompub-protocol-09 (work in progress), June 2006.
[CALDAV]
free dating sites for marriage, partnersuche online kostenlos ohne anmeldung versenden, and chat community kostenlos chip, “partnervermittlung frauen kostenlos xp”, Internet-Draft draft-dusseault-caldav-13 (work in progress), July 2006.
[draft-whitehead-http-etag]
katholische partnervermittlung osteuropa, “partnervermittlung julia petersburg”, Internet-Draft draft-whitehead-http-etag-00 (work in progress), February 2006.
[HTML]
wie finde ich den richtigen partner für mein kaninchen, Hors, A., and I. Jacobs, “wie finde ich den richtigen partner für mich”, W3C REC-html401-19991224, December 1999, <wie finde ich den richtigen partner fürs leben>.
[RFC2518]
free dating sites to chat, free dating sites that are good, katholische partnervermittlung für senioren, katholische partnervermittlung schweiz, and partnersuche in sachsen youtube, “dating sites free chat rooms”, RFC 2518, February 1999.
[XCAP]
partnersuche wallis dresses, “wo kann man russische frauen kennenlernen”, Internet-Draft draft-ietf-simple-xcap-11 (work in progress), May 2006.

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100 free dating sites for marriage Let us consider a server not having the quality of preserving octet-by-octet identity, for instance because of SVN-style keyword expansion in text content (<wo finde ich partner für dreier>).wo finde ich neuen partner

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free serious dating sites for marriage >> Request (1)

GET /test HTTP/1.1
Host: example.com

beste singlebörse augsburg >> Response (1)

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

# $Revision: 1 $
Sample text.

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free dating sites chats >> Request (2)

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

# $Revision: 1 $
New sample text.

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pakistani chat rooms >> 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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partnervermittlung russische frau youtube >> 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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PUT /test HTTP/1.1
Host: example.com
If-Match: "2"

# $Revision: 1 $
A third attempt.

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live chat south africa >> Response (3)

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

single kostenlos kennenlernen englisch Note that the only problem here is that the client doesn't have an exact copy of the entity it's 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.free singles chat lines online

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# $Revision: 3 $
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singlebörsen österreich gratis versand In this example, the server exposes data extracted from the HTML <title> element ([HTML], live chat online south africa) as a custom WebDAV property ([RFC2518], online south african chat), allowing both read and write access.chat dating free online

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partnersuche horoskop oktober >> Request (1)

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

singlebörse schweiz kostenlos runterladen >> Response (1)

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

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

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partnersuche horoskop kostenlos >> Request (2)

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

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

partnersuche ukraine odessa >> Response (2)

HTTP/1.1 200 OK
ETag: "B"

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singlebörse schweiz kostenlos youtube >> 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>

gratis singlebörsen schweiz youtube >> 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>

gratis singlebörsen schweiz postbus The server knows how to propagate property changes into the HTML content, so it updates the entity by adding an HTML title document accordingly. This causes the entity tag changing to "C".partnersuche kostenlos amberg

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

free dating sites the best A subsequent attempt by the client to update the entity body will fail, unless it realizes that changing WebDAV properties may affect the entity as well. In this case, it would have had to get the current entity tag before proceeding. Of course, this introduces an additional round-trip, and a timing window during which overlapping updates by other clients would go unnoticed.partnervermittlung vera juice

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singlebörse gratis linz >> 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>

singlebörsen in der schweiz >> 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>

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