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../../protocols/http.rst:440
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The HTTP cookies introduced by Netscape_ are key for large e-commerce websites. However, they have also raised many discussions concerning their `potential misuses <http://www.nytimes.com/2001/09/04/technology/04COOK.html>`_. Consider `ad.com`, a company that delivers lots of advertisements on web sites. A web site that wishes to include `ad.com`'s advertisements next to its content will add links to `ad.com` inside its HTML pages. If `ad.com` is used by many web sites, `ad.com` could be able to track the interests of all the users that visit its client websites and use this information to provide targeted advertisements. Privacy advocates have even `sued <http://epic.org/privacy/internet/cookies/>`_ online advertisement companies to force them to comply with the privacy regulations. More recent related technologies also raise `privacy concerns <http://www.eff.org/deeplinks/2009/09/new-cookie-technologies-harder-see-and-remove-wide>`_.
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Footnotes
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../../protocols/http.rst:444
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An example of a non-retrievable URI is `urn:isbn:0-380-81593-1` which is an unique identifier for a book, through the urn scheme (see :rfc:`3187`). Of course, any URI can be made retrievable via a dedicated server or a new protocol but this one has no explicit protocol. Same thing for the scheme tag (see :rfc:`4151`), often used in Web syndication (see :rfc:`4287` about the Atom syndication format). Even when the scheme is retrievable (for instance with `http`), it is often used only as an identifier, not as a way to get a resource. See http://norman.walsh.name/2006/07/25/namesAndAddresses for a good explanation.
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../../protocols/http.rst:447
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The list of standard URI schemes is maintained by IANA_ at http://www.iana.org/assignments/uri-schemes.html
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Favorite icons are small icons that are used to represent web servers in the toolbar of Internet browsers. Microsoft added this feature in their browsers without taking into account the W3C standards. See http://www.w3.org/2005/10/howto-favicon for a discussion on how to cleanly support such favorite icons.
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