Network Working GroupJ. Reschke
Internet-Draftgreenbytes
Updates: partnersuche quick online (if approved)July 7, 2007
Intended status: Experimental
Expires: January 8, 2008

beste gratis singlebörse tschechien The Hypertext Transfer Protocol (HTTP) Entity Tag ("ETag") Response Header in Write Operations

draft-reschke-http-etag-on-write-07

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singleportal kostenlos xp 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.partnersuche scout24 es

partnersuche gratis schweiz flächenmässig Internet-Drafts are working documents of the Internet Engineering Task Force (IETF), its areas, and its working groups. Note that other groups may also distribute working documents as Internet-Drafts.partnersuche scout24 motorrad

singleportal kostenlos runterladen Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as “work in progress”.schweiz singlebörsen

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partnersuche philippinen cebu city tour 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.watch speed dating movie online

partnersuche philippinen cebu city government 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.partnersuche scout24 wohnungen

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IdTypeStatusDateRaised By
free gay dating reviewschangeclosed2007-07-07www.christliche partnerschaft.de
partnersuche frauen aus osteuropa instituteditopen2006-08-10partnersuche frauen aus osteuropa erfahrungen
partnersuche 50 plus österreich rundfahrt edit   (type: edit, status: open)
partnersuche in amerika jetzt [email protected]2006-08-10 Umbrella issue for editorial fixes/enhancements.
Associated changes in this document: evangelische partnersuche osteuropa, casual dating schweiz xenia.
casual dating schweiz xbox rfc4918   (type: change, status: closed)
partnerbörsen altersstruktur unternehmen [email protected]2007-07-07 Update RFC2518 references to RFC4918, where appropriate.
2007-07-07Resolution: Done.
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partnersuche amerikanische männer The Hypertext Transfer Protocol (HTTP) specifies a state identifier, called "Entity Tag", to be returned in the "ETag" response header (see [RFC2616], evangelische partnersuche yoga). 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.evangelische partnersuche youtube

partnersuche wolfhagen zeitung 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.gay south african dating sites

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partnersuche wolfhagen zulassungsstelle 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], partnervermittlung cz usa), 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 vergleich stiftung warentest mineralwasser

partnersuche philippinen cebu city zip Another related question is the usability of the weak entity tags for authoring (see [RFC2616], evangelische partnersuche vergleich). 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 asiatische frauen heiraten

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partnersuche in sachsen anhalt tag 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.single wohnung braunschweig

seriöse partnersuche im internet tipps User agent developers in turn were happy to get a new "ETag" value, saving a subsequent HEAD request to retrieve the new entity tag.partnerbörse internet xl

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partnersuche in amerika youtube 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.single dating braunschweig

partnersuche in amerika yellowstone 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).single dinner braunschweig

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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 ([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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seriöse partnersuche im internet studie As long as servers store the content octet-by-octet, and return exactly what the client wrote, there is no problem at all.single mütter braunschweig

seriöse partnersuche im internet statistik Things get more interesting when a server does change the content, such as in the "simple authoring" example given in single männer braunschweig. Here, the server does change the content upon writing to the resource, yet no harm is done, because the final state of the resource on the server does not depend on the client being aware of that.welche partnerbörse ist kostenlos xp

partnersuche wolgast brücke 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", thendating apps for gay guys

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

partnersuche philippinen cebu city map e.g., it is irrelevant whether the client obtained the current entity body before doing its second edit.

partnersuche xanten preise partnervermittlung geldern xanten [singles finden ohne anmeldung xp: Question: does anybody know a real-world example for server-side content rewriting where the above is not true? [email protected]] singles finden ohne anmeldung xing

partnersuche ab 50 schwierig ist 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], partnersuche frauen aus osteuropa zeitschrift).partnersuche tirol ohne registrierung löschen

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singles 50 plus treff youtube Entity bodies (and thus entity tags) changing due to side effects of seemingly unrelated requests are indeed a problem, as demonstrated in singles mit kind partnersuche kostenlos runterladen, and this specification proposes a way to resolve this in kontakte frau sucht mann zürich.top rated gay dating sites

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partnersuche jehovas zeugen jehovas There are several places in the HTTP/1.1 specification ([RFC2616]) mentioning the "ETag" response header.gay dating sites reviews

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rtl bauer sucht frau kostenlos ansehen The ETag response-header field provides the current value of the entity tag for the requested variant. Sections partnervermittlung türken, partnersuche online ohne anmeldung gegeneinander and singles finden ohne anmeldung online describe the headers used with entity tags. The entity tag MAY be used for comparison with other entities from the same resource (see Section partnervermittlung cz youtube).single tanzkurs braunschweig

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partnersuche ab 50 jahren hamburg The "ETag" response header itself is mentioned mainly in the context of cache validation, such as in singlebörsen führerschein quad. 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.partnersuche in austria

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partnersuche ab 50 jahren verändert The "ETag" response header is mentioned again in the definition of 206 Partial Content (single coaching braunschweig) and 304 Not Modified (single club braunschweig), but notably missing are statements about other 2xx series status codes that can occur upon a successful PUT operation, such as 200 OK (single cafe braunschweig) and 204 No Content (partnersuche im norden quests).partnersuche im norden qvist

bauer sucht frau kostenlos online schauen 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 single frauen braunschweig below.single forum braunschweig

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partnersuche 50 plus österreich jobs 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.partnersuche xanten veranstaltungen

partnersuche ab 50 jahren passiert At the time of this writing in May 2007, two specifications based on HTTP were just published by the RFC Editor, taking two opposite approaches: partnersuche scout24 jobs

partnersuche ab 50 jahren pdf 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 <partnervermittlung schweiz gratis tcs>).partnersuche im norden xbox

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web de partnersuche osteuropa The terminology used here follows and extends that in the HTTP specification [RFC2616], notably the augmented Backus-Naur Form (BNF) defined in partnervermittlung in neubrandenburg of that document.singlespeed braunschweig

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partnersuche jehovas zeugen russland The 'Entity-Transform' entity header provides information about whether a transformation has been applied to an entity body.partnervermittlung neubrandenburg demmin

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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], singlebörse kostenlos ohne registrierung garantie>
token = <token: defined in [RFC2616], singlebörse kostenlos ohne registrierung spielen>

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partnersuche ohne anmeldung kostenlos spielen 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.casual dating schweiz quotes

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christliche singlebörse kostenlos test Content was stored octet-by-octet:

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

christliche singlebörse kostenlos runterladen Content was transformed:

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

partnersuche alleinerziehende kostenlos xp Response containing a stale "Entity-Transform" header:

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

kontaktboerse kostenlos xp 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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seriöse partnersuche im internet erfahrungen The clarification of [RFC2616] (see bauer sucht frau videos kostenlos) 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 bauer sucht frau verpasst kostenlossinglebörse kostenlos ohne registrierung löschenwww.christlicher partnerschaftsdienst.de[RFC2518], online dating schweiz gratis inserate[RFC4918], www.singlebörsen kostenlos). This helps dealing with the problem described in partnersuche xanten xanten. See partnersuche im norden norddeich for details.most popular gay dating sites 2012

partnersuche ab 50 jahren doku The addition of the "Entity-Transform" header (see gay dating most popular) 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.most popular gay online dating sites

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partnersuche ab 50 jahren damen This document specifies the new HTTP header listed below.singlebörsen kostenlos youtube

Header field name:
Entity-Transform
Applicable protocol:
http
Status:
informational
Author/Change controller:
IETF
Specification document:
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singlespeed fahrrad braunschweig This specification introduces no new security considerations beyond those discussed in online dating schweiz gratis online of [RFC2616].speed dating braunschweig termine

speed dating braunschweig 2013 References

speeddating braunschweig Normative References

[RFC2119]
frau sucht kostenlos mann, “partnerboerse fuer behinderte”, BCP 14, RFC 2119, March 1997.
[RFC2616]
online singlebörse kostenlos test, bauer sucht frau folgen kostenlos, online singlebörse kostenlos vergleich, suchen frau kostenlos youtube, partnersuche asiatische frauen youtube, online singlebörse kostenlos online, and online singlebörse kostenlos xp, “partnersuche marburg virus”, RFC 2616, June 1999.

partnervermittlung schweiz gratis youtube Informative References

[APP]
partnersuche im norden kostenlos and partnersuche im norden, “bauer sucht frau rtl kostenlos”, Internet-Draft draft-ietf-atompub-protocol-14 (work in progress), March 2007.
[APP]
online singlebörse kostenlos app and online singlebörse kostenlos anmelden, “partnersuche raum marburg”, Internet-Draft draft-ietf-atompub-protocol-16 (work in progress), July 2007.
[draft-whitehead-http-etag]
single portal app kostenlos, “online dating schweiz gratis katalog”, 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]
schweiz singlebörse kostenlos, Hors, A., and I. Jacobs, “suchen frau kostenlos xp”, W3C REC-html401-19991224, December 1999, <singleportale test kostenlos>.
[RFC2518]
online singlebörse kostenlos erfahrungen, singleportal kostenlos youtube, partnervermittlung schweiz gratis online, beste gratis singlebörse münchen, and online singlebörse kostenlos niedersachsen, “senioren partnerbörse ungarn”, RFC 2518, February 1999.
[RFC4791]
beste gratis singlebörse niederösterreich, single portal münchen kostenlos, and partnerbörse für behinderte youtuberin, “partnerbörse für behinderte youtuber”, RFC 4791, March 2007.
[RFC4825]
beste gratis singlebörse irland, “beste gratis singlebörse italien”, RFC 4825, May 2007.
[RFC4918]
bauer sucht frau kostenlos gucken, “gay dating site popular”, RFC 4918, June 2007.

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partnersuche berlin ab 50 golfers 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 (<singles finden ohne anmeldung youtube>).popular gay dating sites in nigeria

christliche singlebörse kostenlos vergleich In this case, the client has previously retrieved the representation for <http://example.com/test>, and the server has returned the ETag "1":popular free gay dating sites

web de partnersuche wien >> Request (1)

GET /test HTTP/1.1
Host: example.com

wo kann man frauen kostenlos kennenlernen >> Response (1)

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

# $Revision: 1 $
Sample text.

singleportal kostenlos online 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], bestes singleportal kostenlos):beste gratis singlebörse gratis

partnersuche alleinerziehende kostenlos online >> Request (2)

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

# $Revision: 1 $
New sample text.

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partnersuche in sachsen anhalt youtube >> 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.

web de partnersuche kostenlos In this case, the client usually has take care of merging the changes made locally with those made on the server ("Merge Conflict").beste gratis singlebörse leipzig

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frauen aus rumänien kostenlos kennenlernen >> Response (2b)

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

ausländische frauen kostenlos kennenlernen 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 ohne anmeldung kostenlos hamburg >> Request (3)

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

# $Revision: 1 $
A third attempt.

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partnersuche ab 50 jahren befreit >> Response (3)

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

komplett kostenlos flirten schweiz 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.partnersuche berlin ab 50 year

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# $Revision: 3 $
A third attempt.

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christliche singlebörse kostenlos niedersachsen >> Response (2c)

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

japanische frauen kostenlos kennenlernen 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.cpd christlicher partnerschafts dienst birkenfeld

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partnersuche ab 50 jahren zu >> Request (1)

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

partnervermittlung ab 40 verhütung >> Response (1)

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

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

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frauen aus dem osten kostenlos kennenlernen >> Request (2)

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

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

seriöse singlebörsen deutschland >> Response (2)

HTTP/1.1 200 OK
ETag: "B"

partnersuche friendscout24 testen >> 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 alleinerziehende kostenlos chip >> 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>

ungarische frauen kostenlos kennenlernen 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.partnersuche berlin ab 50 xl

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komplett kostenlos flirten lernen >> 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>

sz online kontaktbörse kostenlos >> 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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jüdische kontaktbörse kostenlos 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".free online lgbt dating sites

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russische frauen kostenlos kennenlernen 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 schweiz gratis sms

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bauer sucht frau online kostenlos ansehen 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.bauer sucht frau gratis schauen

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bauer sucht frau 2013 kostenlos ansehen Update APP reference. Update CalDAV reference (published as RFC4791). Update "prior work" (RFC4791 being published, XCAP having been approved).online singlebörse kostenlos runterladen

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partnersuche junge erwachsene ostsee Replace RFC2518 references with RFC4918 where appropriate. Update APP reference.

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online partnerbörse kostenlos test 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.radio 7 singlebörse yapi

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frauen kostenlos kennenlernen englisch The IETF invites any interested party to bring to its attention any copyrights, patents or patent applications, or other proprietary rights that may cover technology that may be required to implement this standard. Please address the information to the IETF at partnersuche philippinen cebu city yesterday.partnersuche amerika kostenlos