Network Working GroupJ. Reschke
Updates: christian dating website in canada (if approved)October 25, 2007
Intended status: Experimental
Expires: April 27, 2008

rumänische partnervermittlung jerak The Hypertext Transfer Protocol (HTTP) Entity Tag ("ETag") Response Header in Write Operations


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partnervermittlung schweiz jobs 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.silvester für singles im saarland

partnervermittlung schweiz ukraine 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 dating sites in canada

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IdTypeStatusDateRaised By
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partnervermittlung eger dresden The Hypertext Transfer Protocol (HTTP) specifies a state identifier, called "Entity Tag", to be returned in the "ETag" response header (see [RFC2616], online dating sites in dhaka). 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 bangladeshi online dating site

partnersuche kostenlos ohne e mail This document explains the problem in detail and suggests both a clarification for a revision to [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.schwarzes brett bremen partnersuche

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partnersuche patchworkfamilie 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], online dating sites bangladesh), 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 bangladeshi online dating sites

partnersuche patchwork Another related question is the usability of the weak entity tags for authoring (see [RFC2616], online dating site in dhaka). 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 dating in dhaka bangladesh

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free dating sites in germany without payment Server implementers added code that would return the new value of the "ETag" header in a response to a successful PUT request. After all, the client could be interested in it.bei facebook singles finden

free dating site in german User agent developers in turn were happy to get a new "ETag" value, saving a subsequent HEAD request to retrieve the new entity tag.spirituelle partnersuche

100 free dating site in germany However, at some point of time, potentially during a Web Distributed Authoring and Versioning (WebDAV, [RFC2518], obsoleted by [RFC4918]) interoperability event, client programmers asked server programmers 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.dhaka online dating site

how i hacked online dating transcript 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.bangladeshi online dating website

spirituelle singlebörse österreich 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).partnersuche in meiner stadt

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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 ([RFC4825]), Calendaring data ([RFC4791]) or newsfeed data (muslim speed dating birmingham ukchristian speed dating birmingham uk[APP][RFC5023]).
  • 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 [RFC4918], bangladesh best dating site) 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).

partner suchen deutschland As long as servers store the content octet-by-octet, and return exactly what the client wrote, there is no problem at all.kleinanzeigen partnersuche vorarlberg

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partnervermittlung spanien kostenlos All of the content rewriting examples mentioned above have this quality: the client can safely continue to edit the entity it sent, because the result of the transformation done by the server will be the same in the end. Formally, if we call the server-side transformation "t", the initial content "c", and the client-side editing steps "e1" and "e2", thenfrauen in deiner nähe kennenlernen

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

seriöse partnervermittlung spanien e.g., it is irrelevant whether the client obtained the current entity body before doing its second edit.

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partnersuche julia Problems will only occur if the client uses the entity body it sent, and the entity tag it obtained in return, in subsequent requests that only transfer part of the entity body, such as GET or PUT requests using the "Range" request header (see [RFC2616], partnervermittlung jerak).kostenlos partnersuche online

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singles clubs in frankfurt There are several places in the HTTP/1.1 specification ([RFC2616]) mentioning the "ETag" response online dating in dhaka

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italienische singles in frankfurt The ETag response-header field provides the current value of the entity tag for the requested variant. Sections ebay kleinanzeigen partnersuche, kleinanzeigen partnersuche hamburg and partnervermittlung vip international describe the headers used with entity tags. The entity tag MAY be used for comparison with other entities from the same resource (see Section beste partnerbörse berlin).hochschulsport berlin partnerbörse

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www.partnersuche The response-header fields allow the server to pass additional information about the response which cannot be placed in the Status-Line. These header fields give information about the server and about further access to the resource identified by the Request-URI.partnervermittlung linz fortunatus

partnersuche altersstruktur The "ETag" response header itself is mentioned mainly in the context of cache validation, such as in partnersuche in flensburg. What is missing is a coherent description on how the origin server can notify the user-agent when the entity tag changes as result of a write operation, such as PUT.frauen suchen einen mann

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frauen partnersuche The "ETag" response header is mentioned again in the definition of 206 Partial Content (besten partnerbörsen internet) and 304 Not Modified (bewertung partnersuche internet), but notably missing are statements about other 2xx series status codes that can occur upon a successful PUT operation, such as 200 OK (partnervermittlerin ksenia droben erfahrungsberichte) and 204 No Content (partnersuche in ingolstadt).erfahrung partnersuche internet

partnersuche frauen aus polen 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 gleichklang partnersuche erfahrungen below.partnersuche kleinanzeigen ebay

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partnersuche frauen ab 45 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.partner suche ohne anmelden

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partnersuche frauen kostenlos In essence, this makes it impossible to implement an HTTP resource that conforms to both specifications. Due to the differing use cases of XCAP and CalDAV, this may not be a problem in practice, but the disagreement in itself is scary. Publication of these specifications on the standards track will make it much harder for future protocols to deal with this topic in a meaningful way (comments were sent during IETF Last Call for CalDAV, see <partnersuche frankreich>).partnervermittlung litauen

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stellenangebote jobs partnervermittlung The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL-NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in [RFC2119].ihr singlebörsen vergleich

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facebook singles in der nähe The response MAY contain an ETag response header field indicating the current value of the entity tag (100 gratis singlebörse österreich) for the requested variant. The value SHOULD be the same as the one returned upon a subsequent HEAD request addressing the same singlebörse österreich vergleich

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50plus treff de kostenlos anmelden partnersuche bernkastelpartnersuche in bernchristliche dating seite rumänische partnervermittlung [christliche dating site schweiz: Should "requested variant" be clarified in the context of write operations? [email protected]] Note that the term "requested variant" is somewhat misleading, in particular in the context of write operations (see <partnersuche ab 45 kostenlos> on the RFC2616bis issues list). singles über 50 kostenlos

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partnersuche erding The 'Entity-Transform' entity header provides information about whether a transformation has been applied to an entity body.alternative partnersuche

50plus treff partnersuche 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.alternative partnersuche österreich

50 plus treff de partnersuche 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], alternative partnersuche berlin). In addition, the value format is defined so that a client can reliably detect whether the information is fresh.partnersuche tschechiens frauen

partnersuche lübeck Format:

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], partnervermittlung schweiz christlich>
token = <token: defined in [RFC2616], partnersuche schweiz christlich>

german dating site free The entity-tag specifies the entity body to which this information applies.partnersuche

germany muslim dating site 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).partnersuche emsland kostenlos

good german dating sites 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 submitted entity.singlebörse für senioren kostenlos

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germany christian dating sites Content was stored octet-by-octet:

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

germany dating site Content was transformed:

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

partnervermittlung werbung Response containing a stale "Entity-Transform" header:

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

frauen suchen mann kostenlos 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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mann suchen kostenlos The clarification of [RFC2616] (see singles kennenlernen) 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 [RFC4918], singles kennenlernen köln). This helps dealing with the problem described in singles kennenlernen münchen. See singles kennenlernen zürich for details.partnersuche mit zwei kindern

partnervermittlung tirol kostenlos The addition of the "Entity-Transform" header (see christliche partnersuche stuttgart) 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.partnersuche in leipzig

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Header field name:
Applicable protocol:
Author/Change controller:
Specification document:
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frauen suchen männer zum heiraten References

frauen suchen männer für urlaub Normative References

frauen suchen männer in berlin, “meine stadt .de mönchengladbach partnersuche”, BCP 14, RFC 2119, March 1997.
[RFC2616] bremen partnersuche, partnersuche paderborn meine stadt de, männer suchen frauen berlin, männer suchen frauen zum heiraten, männer suchen frauen, männer suchen frauen in deutschland, and männer suchen frauen alaska, “partnersuche am bodensee”, RFC 2616, June 1999.

partnersuche kostenlos stiftung warentest Informative References

partnerbörsen vergleich stiftung warentest, “singlebörsen vergleich stiftung warentest 2014”, 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.)
singles schweiz ohne anmeldung, Hors, A., and I. Jacobs, “singles in der schweiz statistik”, W3C REC-html401-19991224, December 1999, <singles aus der schweiz kennenlernen>.
singles schweiz facebook, singles schweiz app, singles in der schweiz gratis, partnersuche luzern, and partnersuche luzern gratis, “partnersuche luzerner zeitung”, RFC 2518, February 1999.
online dating kostenlos weltweit, online dating kostenlos berlin, and online dating kostenlos österreich, “amerikanische singlebörse deutschland”, RFC 4791, March 2007.
amerikanische singlebörse, “partnerbörsen vergleich 2013”, RFC 4825, May 2007.
vergleich partnerbörsen im internet, “vergleich partnerbörsen preise”, RFC 4918, June 2007.
singlebörse elitepartner kosten and singlebörse elitepartner, “reiche single männer frankfurt”, Internet-Draft draft-ietf-atompub-protocol-16 (work in progress), July 2007.
reiche single männer hamburg and partnervermittlung 55plus, “partnervermittlung plauen”, RFC 5023, October 2007.

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reisepartner gesucht australien 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 (<platinum partnervermittlung>).partnervermittlung platin

reisepartner gesucht island In this case, the client has previously retrieved the representation for <>, and the server has returned the ETag "1":partnervermittlung 40 plus

reisepartner gesucht weltreise >> Request (1)

GET /test HTTP/1.1

partnervermittlung new york >> Response (1)

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

# $Revision: 1 $
Sample text.

partnersuche ohne registrierung 60+ 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], benutzerkonto):partnersuche hiv positive

partnersuche aus polen >> Request (2)

PUT /test HTTP/1.1
If-Match: "1"

# $Revision: 1 $
New sample text.

partnersuche polen männer If the resource was modified in the meantime, the server will reject the request with a 412 Precondition Failed status:partnersuche augsburg kostenlos

partnerbörse vergleich >> 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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online dating österreich test >> Response (2b)

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

fischkopf singlebörse ostfriesland Note however, that at this point the client knows the new entity tag, but doesn not know the current representation, which will have been updated by the server to:

# $Revision: 2 $
New sample text.

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fischkopf singlebörse erfahrungen >> Request (3)

PUT /test HTTP/1.1
If-Match: "2"

# $Revision: 1 $
A third attempt.

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fischkopf singlebörse account löschen >> Response (3)

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

wedding date kostenlos online sehen 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 für singles ab 50 kostenlos

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# $Revision: 3 $
A third attempt.

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date spiele kostenlos online >> Response (2c)

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

partnerbörsen senioren vergleich This indicates that the content that was sent is not octet-by-octet identical to what a subsequent GET request would retrieve. It is then up to the client to decide whether it wants to re-fetch the content before continuing edits.kostenlos registrieren

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partnerbörsen für senioren In this example, the server exposes data extracted from the HTML <title> element ([HTML], kleinanzeigen berlin kostenlos) as a custom WebDAV property ([RFC4918], singlebörse erfahrung 2014), allowing both read and write access.finya singlebörse erfahrungen

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alleinerziehende singles münchen >> Request (1)

GET /test.html HTTP/1.1

alleinerziehende singles chat kostenlos >> Response (1)

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


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partnersuche anzeigen zeitung >> Request (2)

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

    <p>First paragraph.</p>

partnersuche anzeigen berlin >> Response (2)

HTTP/1.1 200 OK
ETag: "B"

partnersuche anzeigen Next, the client sets a custom "title" property (see [RFC4918], singlebörse erfahrungsbericht):singlebörse erfahrung

anzeigenkurier partnersuche >> Request (3)

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

<proppatch xmlns="DAV:">
      <title xmlns=""
      >A sample document</title>

partnersuche anzeigen beispiele >> Response (3)

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

<multistatus xmlns="DAV:">
        <title xmlns=""/>
      <status>HTTP/1.1 2OO OK</status>

dating schweiz kostenlos 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".partnerbörse schweiz kostenlos

sms dating kostenlos schweiz The new entity body is shown below, but the client does not realize that it did change at all.

    <title>A sample document</title>
    <p>First paragraph.</p>

spirituelle partnersuche kostenlos 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.seriöse partnerbörse schweiz

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christliche singlebörse >> Request (3)

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

<proppatch xmlns="DAV:">
      <title xmlns="">
        A sample document

single und glücklich >> Response (3)

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

<multistatus xmlns="DAV:">
        <title xmlns=""/>
      <status>HTTP/1.1 2OO OK</status>

lieber single und glücklich 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.partnersuche 50 plus hamburg

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ewig single und glücklich 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 dating treffen absagen

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partnersuche de aktionscode 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".größte deutsche partnerbörse

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partnerbörsen deutschland 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".singles gratis finden

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partnersuche elite kostenlos 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.suche frau fürs leben ohne anmeldung

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mainfranken chat single partnerbörse Update APP reference. Update CalDAV reference (published as RFC4791). Update "prior work" (RFC4791 being published, XCAP having been approved).suche neue frau fürs leben

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single partnerbörse Update XCAP reference (published as RFC4825). Update "prior work" (RFC4825 being published).partnersuche christlicher basis

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single eltern partnersuche Replace RFC2518 references with RFC4918 where appropriate. Update APP reference.lablue chat partnersuche kostenlos

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single mama partnersuche Update APP reference. Reference the "requested variant" issue on the RFC2616bis issues list (< test>).

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