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3.1.5.1.3 Receiving a wsignin1.0 Request That Specifies a ttpindex Other Than 0

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When the IP/STS receives a wsignin1.0 request that specifies a ttpindex parameter value other than 0, the following conditions MUST be evaluated in order:

  1. The ttpindex value does not conform to message syntax rules (for example, if it is not a number, as specified in section 2.2.2.1.1).

  2. The corresponding pending result is not available.

  3. The value of ttpindex is greater than or equal to the length in characters of the pending result.

If the message meets any of the conditions, the IP/STS MUST reject the message and return an HTTP 500 response. Otherwise, the IP/STS MUST respond as specified in section 3.1.5.1.4.