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Requirements It MUST be possible for a UAC to detect when a request has been retargeted. A domain that changes the target of a request MUST be capable of informing the UAC of the new target(s). The mechanism MUST allow simple intradomain retargeting in cases where persistent TLS connections are used as a NAT traversal mechanism. It must be possible for a domain that changes the target of a request to inform the UAC of the new target(s) prior to contacting any of the new target(s). There MUST furthermore be a way for intermediaries to determine when UACs require prior information about new targets. It MUST be possible to preserve the privacy of targets and potential targets of requests. It MUST be possible to preserve the ordering of a target set desired by the domain that changes the target of a request. |