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5) Section 4.1.5. Statement to be added: "The request MUST NOT be altered Whenever the URI of the request indicates that the resource being accessed is able to provide mobile-optimized content, e.g. the domain is *.mobi, wap.*, m.*, mobile.*, pda.*, imode.*, iphone.*, or the leading portion of the path is /m/ or /mobile/." Rationale: The guidelines make the assumption that all requests may first undergo a transformation before possibly falling back on a transformationless mode of operation. This is unwarranted, and does not correspond to the way many deployed proxies operate. Obviously, it is rather pointless to go all the way to send a request to the server and wait for its response in order to detect whether the resources accessed are for mobile use, when it is already possible to do this by inspecting the request of the client. The addition to the guidelines covers this situation, and corresponds to the state of the art in transformation proxies. It is also consistent with the heuristic serving to determine whether a response is already mobile-optimized. Following this new guideline improves the performance of the entire content delivery chain without loss of functionality, and is congruent with the stated objective of the guidelines of not disturbing mobile-optimized content.