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The docs [login required] state that your web application cd_ambient_conf.xml should contain the following cartridges when setting up Session Preview:

<Cartridge File="cd_webservice_preview_cartridge.xml"/>
<Cartridge File="footprint_cartridge_conf.xml"/>

Firstly, is that a typo with the first cartridge? We are using session_cartridge_conf.xml and it works fine. UPDATE: I see that session_cartridge_conf.xml is for SmartTarget, so ignore this.

Secondly, what do these cartridges actually do? I can't find it described anywhere in the docs. I had assumed that the footprint cartridge overrides values in the ADF from Footprints sent by XPM, however we do not have this configured, yet Footprints seem to work just fine.

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The preview cartridge (cd_preview_ambient.jar) manages your sessions -- ensuring that you have a valid token that hasn't expired, creating a new sessions as necessary, etc.

The footprint cartridge just adds some standard claims about the session. I think this one is mostly there for backwards-compatibility and to provide some claims out-of-the-box for the Footprint functionality in Experience Manager. In case you are wondering, it's part of the cd_preview_web.jar file; there is no footprint_cartridge.jar file anymore.

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  • OK - that makes more sense. What bit of all this actually overrides ADF claims with the values from the footprint then?
    – Will Price
    Jan 20, 2015 at 11:10
  • The PreviewClaimStore does the actual overwriting of claim values based on the footprint cookie(s) sent in the request.
    – Peter Kjaer
    Jan 21, 2015 at 13:21

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