HTTP Working GroupI. Grigorik
Internet-DraftGoogle
Intended status: Standards TrackNovember 24, 2015
Expires: May 27, 2016

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draft-ietf-httpbis-client-hints-latest

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partnervermittlung russische frauen in deutschland eingeführt An increasing diversity of Web-connected devices and software capabilities has created a need to deliver optimized content for each device.best software for online voice chat

partnersuche mit niveau kostenlos xp This specification defines a set of HTTP request header fields, colloquially known as Client Hints, to address this. They are intended to be used as input to proactive content negotiation; just as the Accept header allows clients to indicate what formats they prefer, Client Hints allow clients to indicate a list of device and agent specific preferences.online game voice chat software

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partnervermittlung russische frauen in deutschland kennenlernen Internet-Drafts are working documents of the Internet Engineering Task Force (IETF). Note that other groups may also distribute working documents as Internet-Drafts. The list of current Internet-Drafts is at best fb chat app apk.partnervermittlung thailand wetter

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partnervermittlung agentur berlin restkarten There are thousands of different devices accessing the web, each with different device capabilities and preference information. These device capabilities include hardware and software characteristics, as well as dynamic user and client preferences.yahoo chat client osx

partnervermittlung agentur berlin reinickendorf One way to infer some of these capabilities is through User-Agent (UA) detection against an established database of client signatures. However, this technique requires acquiring such a database, integrating it into the serving path, and keeping it up to date. However, even once this infrastructure is deployed, UA sniffing has numerous limitations:welche partnerbörse ist die beste youtuberin

partnervermittlung agentur berlin werbung A popular alternative strategy is to use HTTP cookies to communicate some information about the client. However, this approach is also not cache friendly, bound by same origin policy, and imposes additional client-side latency by requiring JavaScript execution to create and manage HTTP cookies.yahoo chat room no registration

motto bei partnersuche wien This document defines a set of new request header fields that allow the client to perform proactive content negotiation [RFC7231] by indicating a list of device and agent specific preferences, through a mechanism similar to the Accept header which is used to indicate preferred response formats.descargar facebook chat para blackberry curve 8520

partnersuche kostenlos und ohne registrierung flirten Client Hints does not supersede or replace the User-Agent header field. Existing device detection mechanisms can continue to use both mechanisms if necessary. By advertising its capabilities within a request header field, Client Hints allows for cache friendly and proactive content negotiation.descargar chat facebook para blackberry curve 8520 gratis

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www partnersuche neu de nos This document uses the Augmented Backus-Naur Form (ABNF) notation of [RFC5234] with the list rule extension defined in [RFC7230], Appendix B. It includes by reference the DIGIT rule from [RFC5234]; the OWS, field-name and quoted-string rules from [RFC7230]; and the parameter rule from [RFC7231].chat gratis schweiz youtube

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partnervermittlung agentur berlin brandenburg A Client Hint request header field is a HTTP header field that is used by HTTP clients to indicate configuration data that can be used by the server to select an appropriate response. Each one conveys a list of client preferences that the server can use to adapt and optimize the response.yahoo chat room without registration

partnervermittlung agentur berlin bewerbung This document defines a selection of Client Hint request header fields, and can be referenced by other specifications wishing to use the same syntax and processing model.profiltexte partnersuche beispiele

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motto bei partnersuche kostenlos Clients control which Client Hint headers and their respective header fields are communicated, based on their default settings, user configuration and/or preferences. The user may be given the choice to enable, disable, or override specific hints.kostenlos chat in der schweiz

www partnersuche neu de cravate The client and server, or an intermediate proxy, may use an opt-in mechanism to negotiate which fields should be reported to allow for efficient content adaption.partnersuche kostenlos ab 40 zoll

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ihr motto bei der partnersuche Servers MAY respond with an optimized response based on one or more received hints from the client. When doing so, and if the resource is cacheable, the server MUST also emit a Vary response header field ([RFC7234]), and optionally Key ([I-D.ietf-httpbis-key]), to indicate which hints were used and whether the selected response is appropriate for a later request.yahoo chat rooms mac os x

learning english through chat Further, depending on the used hint, the server MAY also need to emit additional response header fields to confirm the property of the response, such that the client can adjust its processing. For example, this specification defines “Content-DPR” response header field that MUST be returned by the server when the “DPR” hint is used to select the response.www partnersuche 40 gold de herbalife

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www partnersuche neu de münchen Servers can advertise support for Client Hints using the Accept-CH header or an equivalent HTML meta element with http-equiv attribute.www partnersuche 40 gold de xbox

  Accept-CH = #token

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  Accept-CH: DPR, Width, Viewport-Width, Downlink

motto bei der partnersuche When a client receives Accept-CH, it SHOULD append the Client Hint headers that match the advertised field-values. For example, based on Accept-CH example above, the client would append DPR, Width, Viewport-Width, and Downlink headers to all subsequent requests.yahoo chat rooms apple

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beste partnervermittlung kostenlos chip When selecting an optimized response based on one or more Client Hints, and if the resource is cacheable, the server MUST also emit a Vary response header field ([RFC7234]) to indicate which hints were used and whether the selected response is appropriate for a later request.partnersuche profiltext tips

  Vary: DPR

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  Vary: DPR, Width, Downlink

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partnervermittlung agentur berlin mitte Client Hints MAY be combined with Key ([I-D.ietf-httpbis-key]) to enable fine-grained control of the cache key for improved cache efficiency. For example, the server MAY return the following set of instructions:cai dat yahoo chat cho macbook

  Key: DPR;partition=1.5:2.5:4.0

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  Key: Width;div=320

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  Key: Downlink;partition=0.5:1.0:3.0:5.0:10

fb chat app apk Above example indicates that the cache key should be based on the (Mbps) value of the Downlink header with six segments: less than 0.5, 0.5 to less than 1.0, 1.0 to less than 3.0, 3.0 to less than 5.0, 5.0 to less than 10; 10 or higher.yahoo chat mac problems

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partnervermittlung agentur berlin neukölln The “DPR” header field is a number that, in requests, indicates the client’s current Device Pixel Ratio (DPR), which is the ratio of physical pixels over CSS px of the layout viewport on the device.astrologische partnersuche yoga

  DPR = 1*DIGIT [ "." 1*DIGIT ]

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beste partnervermittlung kostenlos youtube The “Content-DPR” header field is a number that indicates the ratio between physical pixels over CSS px of the selected image response.www partnersuche 40 gold de erfahrung

  Content-DPR = 1*DIGIT [ "." 1*DIGIT ]

partnervermittlung afrikanerin daten DPR ratio affects the calculation of intrinsic size of image resources on the client - i.e. typically, the client automatically scales the natural size of the image by the DPR ratio to derive its display dimensions. As a result, the server must explicitly indicate the DPR of the selected image response whenever the DPR hint is used, and the client must use the DPR value returned by the server to perform its calculations. In case the server returned Content-DPR value contradicts previous client-side DPR indication, the server returned value must take precedence.partnersuche in rostock youtube

kleinanzeigen norderstedt kostenlos Note that DPR confirmation is only required for image responses, and the server does not need to confirm the resource width as this value can be derived from the resource itself once it is decoded by the client.www partnersuche 40 gold de yepes

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partnervermittlung afrikanerin heiraten The “Width” header field is a number that, in requests, indicates the resource width in physical px (i.e. intrinsic size of an image). The provided physical px value is a number rounded to the largest smallest following integer (i.e. ceiling value).www partnersuche 40 gold de unturned

  Width = 1*DIGIT

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kleinanzeigen solingen kostenlos The “Viewport-Width” header field is a number that, in requests, indicates the layout viewport width in CSS px. The provided CSS px value is a number rounded to the largest smallest following integer (i.e. ceiling value).fb chat for samsung wave 525

  Viewport-Width = 1*DIGIT

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kleinanzeigen kostenlos saarland The “Save-Data” header field is a token that, in requests, indicates client’s preference for reduced data usage, due to high transfer costs, slow connection speeds, or other reasons.live chat android

  Save-Data = "on"

kleinanzeigen kostenlos südtirol The token is a signal indicating explicit user opt-in into a reduced data usage mode on the client, and when communicated to origins allows them to deliver alternate content honoring such preference - e.g. smaller image and video resources, alternate markup, and so on.live chat android online

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kleinanzeigen kostenlos schalten For example, given the following request headers:german dating site toronto

  DPR: 2.0
  Width: 320
  Viewport-Width: 320

kleinanzeigen script kostenlos The server knows that the device pixel ratio is 2.0, that the intended display width of requested resource is 160 CSS px (320 physical pixels at 2x resolution), and that the viewport width is 320 CSS px.facebook chat messenger for nokia c1 01

kleinanzeigen international kostenlos If the server uses above hints to perform resource selection for an image asset, it must confirm its selection via the Content-DPR response header to allow the client to calculate the appropriate intrinsic size of the image response. The server does not need to confirm resource width, only the ratio between physical pixels and CSS px of the selected image resource:astrologische partnersuche vergleich

  Content-DPR: 1.0

kleinanzeigen kostenlos immobilien The Content-DPR response header indicates to the client that the server has selected resource with DPR ratio of 1.0. The client may use this information to perform additional processing on the resource - for example, calculate the appropriate intrinsic size of the image resource such that it is displayed at the correct resolution.partnersuche katholisch modern

kleinanzeigen kostenlos in österreich Alternatively, the server could select an alternate resource based on the maximum downlink speed advertised in the request headers:partnersuche bei edarling vergleich

  Downlink: 0.384

kleinanzeigen kostenlos internet The server knows that the client’s maximum downlink speed is 0.384Mbps (GPRS EDGE), and it may use this information to select an optimized resource - for example, an alternate image asset, stylesheet, HTML document, media stream, and so on.partnersuche bei edarling impressum

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kleinanzeigen kostenlos ingolstadt Client Hints defined in this specification do not expose any new information about the user’s environment beyond what is already available to, and may be communicated by, the application at runtime via JavaScript - e.g. viewport and image display width, device pixel ratio, and so on.german dating site.com

kleinanzeigen kostenlos in würzburg However, implementors should consider the privacy implications of various methods to enable delivery of Client Hints - see “Sending Client Hints” section. For example, sending Client Hints on all requests may make information about the user’s environment available to origins that otherwise did not have access to this data (e.g. origins hosting non-script resources), which may or not be the desired outcome. The implementors may want to provide mechanisms to control such behavior via explicit opt-in, or other mechanisms. Similarly, the implementors should consider how and whether delivery of Client Hints is affected when the user is in “incognito” or similar privacy mode.free online counselling chat for relationships

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partnervermittlung russische frauen in deutschland studieren Normative References

[I-D.ietf-httpbis-key]
Fielding, R. and m. mnot, “partnervermittlung russische frauen in deutschland statistik”, Internet-Draft draft-ietf-httpbis-key-00 (work in progress), October 2015.
[RFC2119]
Bradner, S., “partnersuche mit niveau kostenlos online”, BCP 14, RFC 2119, facebook chat messenger apk, March 1997, <partnersuche katholisch evangelisch>.
[RFC5234]
Crocker, D., Ed. and P. Overell, “partnersuche mit niveau kostenlos runterladen”, STD 68, RFC 5234, partnersuche bei edarling löschen, January 2008, <partnersuche bei edarling tarif>.
[RFC7230]
Fielding, R., Ed. and J. Reschke, Ed., “partnersuche im internet ohne anmeldung online”, RFC 7230, single kennenlernen kostenlos chip, June 2014, <single kennenlernen kostenlos xp>.
[RFC7231]
Fielding, R., Ed. and J. Reschke, Ed., “partnervermittlung russische frauen in deutschland finden”, RFC 7231, partnersuche kostenlos und ohne registrierung umgehen, June 2014, <partnervermittlung in augsburg>.
[RFC7234]
Fielding, R., Ed., Nottingham, M., Ed., and J. Reschke, Ed., “single kennenlernen kostenlos runterladen”, RFC 7234, find your top 6 chatters fb app, June 2014, <my top 6 chatters fb app>.

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