Edit comment LC-2003 for Mobile Web Best Practices Working Group

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Comment LC-2003

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)
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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:

Also, I see that CTG does not mention "whitelists". I think it should, since many transcoders manage that. The rule (consistently with the concept that transcoders must err on the side of not transcoding) should be that whitelists can only specify which potentially mobile sites can be forced to be trascoded (and not the other way around as happens to be common today, thus potentially forcing mobile developers to ask operators in different countries to whitelist their service, which is of course unacceptable).

Related issues: (space separated ids)

WG Notes: Was: ACTION-833 See: http://www.w3.org/2008/09/23-bpwg-minutes.html#item06 and: http://www.w3.org/2008/10/20-bpwg-minutes.html#item04 Final resolution: - Make a note about the reasons for not referring to lists, of whatever hue, because the preumption about the internal operation of proxies is not in scope, as far as we are concenred these are "black boxes"

Resolution: We have had considerable discussion about "allow" and "disallow" lists and came to the conclusion that it was preferable to discuss a proxy's behavior rather than its (presumed) internal method of operation. Instead we refer to a notion that includes allow and disallow lists under 4.1.5 and 4.2.6. This approach allows us to specify that servers have a way of overcoming mis-configuration without recourse to administrative contact with any operator of a proxy and without specifying the exact configuration mechanism, which is usually not open to public inspection or evaluation. See updated sections 4.1.5: http://www.w3.org/TR/2009/WD-ct-guidelines-20091006/Overview.html#sec-altering-header-values ... and 4.2.6: http://www.w3.org/TR/2009/WD-ct-guidelines-20091006/Overview.html#sec-receipt-of-vary-header

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