Network Working GroupJ. Reschke
Internet-Draftgreenbytes
Updates: single kostenlos kennenlernen ohne anmeldung (if approved)March 2009
Intended status: Experimental
Expires: September 2009

singlebörsen schweiz youtube The Hypertext Transfer Protocol (HTTP) Entity Tag ("ETag") Response Header in Write Operations

draft-reschke-http-etag-on-write-latest

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free online chat sites in south africa 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.partnervermittlung russische frau katalog

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IdTypeStatusDateRaised By
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frau sucht freundin in berlin The Hypertext Transfer Protocol (HTTP) specifies a state identifier, called "Entity Tag", to be returned in the "ETag" response header (see [RFC2616], single kostenlos kennenlernen englisch). 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 singlebörsen schweiz flächenmässig

frau sucht freundin in hamburg 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.singlebörsen österreich gratis versand

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frau sucht freundin in heilbronn 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], singlebörse schweiz kostenlos runterladen), 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 in ukraine quote

frau sucht freundin hamburg Another related question is the usability of the weak entity tags for authoring (see [RFC2616], partnersuche horoskop kostenlos). 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 ukraine odessa

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frau sucht freundin köln 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.gratis singlebörsen schweiz gratis

chat in south africa 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).singlebörse gratis linz

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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 ([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], singlebörse für senioren österreich) 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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frau sucht freundin unternehmen 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", thenpartnersuche ab 50 akademiker

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

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singlebörse 100 kostenlos youtube 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], beste singlebörsen schweiz).singlebörse niederösterreich gratis

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partnersuche tirol kostenlos runterladen There are several places in the HTTP/1.1 specification ([RFC2616]) mentioning the "ETag" response header.singlebörse türkische männer

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suche russische frau kennenlernen The "ETag" response header itself is mentioned mainly in the context of cache validation, such as in singlebörse gratis at. 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.pakistan live chat room video

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die besten singlebörsen in österreich 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 gratis kärnten below.singlebörsen komplett gratis

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bauer sucht frau lukas neue freundin 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].chat date free online

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online partnersuche nachteile The 'Entity-Transform' entity header provides information about whether a transformation has been applied to an entity body.suche deutsche frau zum heiraten

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bauer sucht frau lena freundin 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], www partnersuche ab 50 golf). In addition, the value format is defined so that a client can reliably detect whether the information is fresh.free indian chat room without registration chat dude

partnersuche tirol innsbruck Format:

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

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frau sucht gute freundin 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"

bauer sucht frau freundin getötet Response containing a stale "Entity-Transform" header:

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

bauer sucht frau gunther freundin 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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100 free marriage dating site The clarification of [RFC2616] (see online avatar chat rooms) 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], free online avatar chat sites). This helps dealing with the problem described in online avatar chat games. See pakistani chat rooms mix for details.partnersuche per horoskop

partnersuche online ohne registrierung umgehen The addition of the "Entity-Transform" header (see he hasn't deleted his online dating profile) 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.deleting your online dating profile

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Header field name:
Entity-Transform
Applicable protocol:
http
Status:
informational
Author/Change controller:
IETF
Specification document:
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online partnersuche yoga This specification introduces no new security considerations beyond those discussed in erfahrungen singlebörsen wien of [RFC2616].gratis dating voor ouderen

wo finde ich meine würth partnernummer References

free dating site for horse lovers Normative References

[RFC2119]
partnersuche de kontakt aufnehmen, “ich finde meinen partner sexuell nicht anziehend”, BCP 14, RFC 2119, March 1997.
[RFC2616]
partnersuche de kontakt email, bewertung von singlebörsen, partnervermittlung eurodamen polen, beste single seiten kostenlos, singlebörse schweiz kostenlos telefonieren, free browsing dating sites uk, and free dating sites no fees free browsing, “free dating site browsing”, RFC 2616, June 1999.

partnersuche de kontakt telefon Informative References

[draft-whitehead-http-etag]
test singlebörsen kostenlos, “singlebörsen test kosten”, Internet-Draft draft-whitehead-http-etag-00 (work in progress), February 2006.
(Not updated since.)
[HTML]
partnersuche kostenlos international telefonieren, Hors, A., and I. Jacobs, “schlechte erfahrungen singlebörsen”, W3C REC-html401-19991224, December 1999, <erfahrungen singlebörsen test>.
[RFC2518]
online dating für junge leute rabatt, singlebörse in ostfriesland, türkische singlebörse yapi, türkische singlebörse yasni, and www partnersuche ab 50 xl, “online web chat like chatroulette”, RFC 2518, February 1999.
[RFC4791]
partnersuche in regensburg qis, other chat websites like chatroulette, and singlebörse schweiz kostenlos xp, “live chat room pakistan rawalpindi”, RFC 4791, March 2007.
[RFC4825]
live chat rooms pakistani, “live chat room pakistan video”, RFC 4825, May 2007.
[RFC4918]
online dating für junge leute o2, “erfahrungen online singlebörsen”, RFC 4918, June 2007.
[RFC5023]
partnersuche de kontakt rechnung and live chat room pakistan, “live chat room pakistani”, RFC 5023, October 2007.

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partnersuche online wien youtube In this case, the client has previously retrieved the representation for <http://example.com/test>, and the server has returned the ETag "1":partnervermittlung im emsland

die beste singlebörse vergleich >> Request (1)

GET /test HTTP/1.1
Host: example.com

partnersuche tirol test >> Response (1)

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

# $Revision: 1 $
Sample text.

partnersuche online ohne registrierung garantie 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], partnersuche de kontakt hilfe):online dating für junge leute urlaub

bild online partnersuche >> Request (2)

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

# $Revision: 1 $
New sample text.

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online partnersuche berlin >> 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.

online partnersuche beste In this case, the client usually has take care of merging the changes made locally with those made on the server ("Merge Conflict").partnervermittlung emsland quelle

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new online avatar chat games >> Response (2b)

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

online avatar creator chat games 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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partnersuche online wien xtra >> Request (3)

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

# $Revision: 1 $
A third attempt.

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die beste singlebörse für alleinerziehende >> Response (3)

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

die beste singlebörse app 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.vegan singlebörse kostenlos

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# $Revision: 3 $
A third attempt.

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online partnersuche sprüche >> Response (2c)

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

online partnersuche studie 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.partnervermittlung emsland arena

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partnersuche online wien krems >> Request (1)

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

bauer sucht frau ermordet freundin >> Response (1)

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

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

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bauer sucht frau freundin erstochen >> Request (2)

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

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

bauer sucht frau kandidat ersticht freundin >> Response (2)

HTTP/1.1 200 OK
ETag: "B"

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alleinstehende frau sucht freundin >> 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>

beste singleseiten kostenlos >> 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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online partnersuche gefährlich The new entity body is shown below, but the client does not realize that it did change at all.

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

online partnersuche gefahren 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.free dating sites for married man

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online partnersuche gratis >> 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>

free muslim matrimonial dating site >> 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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best online dating for marriage 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".singlebörse 100 kostenlos kindle

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Hafenweg 16
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EMail: partnervermittlung frauen england
URI: www partnersuche ab 50 zoll