Edit comment LC-2090 for Mobile Web Best Practices Working Group

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Comment LC-2090

Comment Shortname:

Commenter: Luca Passani <passani@eunet.no>

Message-id:

Section of the document concerned:

[Free text description]Document as a wholeContent Transformation Guidelines 1.0 Abstract Status of this Document Table of Contents Appendices 1 Introduction (Non-Normative) 1.1 Purpose 1.2 Audience 1.3 Scope 1.4 Summary of Requirements 2 Terminology (Normative) 2.1 Types of Proxy "A transparent proxy is a proxy that does not modify the req... A non-transparent proxy is a proxy that modifies the request... 2.2 Types of Transformation Restructuring content is a process whereby the original layo... Recoding content is a process whereby the layout of the cont... Optimizing content includes removing redundant white space,... 3 Conformance (Normative) 3.1 Classes of Product 3.2 Normative and Informative Parts 3.3 Normative Language for Conformance Requirements 3.4 Content Deployment Conformance 3.5 Transformation Deployment Conformance 4 Behavior of Components (Normative) 4.1 Proxy Forwarding of Request 4.1.1 Applicable HTTP Methods 4.1.2 no-transform directive in Request 4.1.3 Treatment of Requesters that are not Web browsers 4.1.4 Serving Cached Responses 4.1.5 Alteration of HTTP Header Values In this section, the concept of "Web site" is used (rather t... 4.1.5.1 Content Tasting 4.1.5.2 Avoiding "Request Unacceptable" Responses 4.1.5.3 User Selection of Restructured Experience 4.1.5.4 Sequence of Requests 4.1.5.5 Original Headers 4.1.6 Additional HTTP Headers 4.1.6.1 Proxy Treatment of Via Header 4.2 Server Response to Proxy 4.2.1 Use of HTTP 406 Status 4.2.2 Server Origination of Cache-Control: no-transform Including a Cache-Control: no-transform directive can disrup... 4.2.3 Varying Representations 4.2.3.1 Use of Vary HTTP Header 4.2.3.2 Indication of Intended Presentation Media Type of Representation 4.3 Proxy Forwarding of Response to User Agent 4.3.1 Receipt of Cache-Control: no-transform 4.3.2 Receipt of Warning: 214 Transformation Applied 4.3.3 Server Rejection of HTTP Request 4.3.4 Receipt of Vary HTTP Header 4.3.5 Link to "handheld" Representation 4.3.6 Proxy Decision to Transform 4.3.6.1 Alteration of Response 4.3.6.2 HTTPS Link Re-writing 5 Testing (Normative) A References B Example Transformation Interactions (Non-Normative) B.1 Basic Content Tasting by Proxy B.2 Optimization based on Previous Server Interaction B.3 Optimization based on Previous Server Interaction, Server has Changed its Operation B.4 Server Response Indicating that this Representation is Intended for the Target Device B.5 Server Response Indicating that another Representation is Intended for the Target Device C Applicability to Transforming Solutions which are Out of Scope (Non-Normative) D Scope for Future Work (Non-Normative) D.1 POWDER D.2 link HTTP Header D.3 Sources of Device Information D.4 Inter Proxy Communication D.5 Amendment to and Refinement of HTTP E Administrative Arrangements (Non-Normative) F Acknowledgments (Non-Normative)
or

Refinement of the section concerned:

Status:

open proposal pending resolved_yes resolved_no resolved_partial other assigned to Nobody

Type: substantive editorial typo question general comment undefined

Resolution status:

Response drafted Resolution implemented Reply sent to commenter

Response status:

No response from Commenter yet Commenter approved disposition Commenter objected to disposition
Commenter's response (URI):

Comment:

Hi, I think that CTG should mention the fact that, in case of
transcoding, no extra content should be injected without the consent of
the original content owner. The idea is to avoid that W3C
protocols/guidelines implicitly endorse the attempt by those who
manage the transcoder to monetize on the effort/investment of other
people. Of course, there is also a point that injecting extra content
will invariably affect usability negatively and as such should be avoided.

I suggest the following addition:

"4.3.6.3 Injection of external content
In its effort to optimise the user experience of non-mobile optimised
sites, a proxy *should not* inject extra content into the transcoded
pages, where the term 'extra content' refers to text, links, banners
and other multimedia content which is not available on the original
untranscoded page. Addition of links aimed at implementing pagination
and navigational shortcuts is admissible.

Note: For clarity, it is emphasised that W3C does not endorse injection
of third-party content into a transcoded page without the explicit
consent of the content owner"

Can this comment be added to the tracking system?

Thank you

Luca Passani

Related issues: (space separated ids)

WG Notes: See: http://www.w3.org/2008/09/30-bpwg-minutes.html#item01 Also: http://www.w3.org/2008/09/30-bpwg-minutes.html#item05 and: http://www.w3.org/2008/10/20-bpwg-minutes.html#item29 Final resolutions: - The manner in which transformation is carried out, when it is permitted, including any additional navigational or other material that is included, aside from where explicitly stated (insecure links etc.) will be noted in an "out of scope section" in the document. And resolve no to LC-2090 and LC-2091 - Mention the out of scope nature of the details of restructuring under 4.3.6 somewhere (cf insertion of headers, footers etc.) - Ref LC-2090 and LC-2000, resolve no, other than to note that adding extra content is forbidden where no-transform is present and content providers should use this if they want to be sure their content is not added to

Resolution: The goals of this specification is to provide guidance to Content Transformation proxies and Content Providers as to how inter-work when delivering Web content. In other words, the guidelines are focused on defining means for the various actors of the delivery chain to communicate their intent and expectations. The details of how a Content Transformation proxy performs restructuring operations is out of scope of this specification. The notion of user experience is by essence vague, and one design may be regarded as providing a better user experience by some and a lesser one by someone else. The Working Group notes that alteration and thus injection of extra content is forbidden in responses served with a Cache-Control: no-transform. Content Providers who do not want their content to be altered in any way should use this directive.

(Please make sure the resolution is adapted for public consumption)