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3.4.2.5.5 Sending 200 OK response (Action: Allow clients with static URL)

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This section follows the behavior described in product behavior note <171>.

If the server determines that it can support the version specified in the User-Agent header, it SHOULD allow processing of the REGISTER request and respond with a 200 OK response if the processing succeeds. If the action configured for the version of the UAC is to allow and respond with a static location to download a newer client, the server SHOULD include a Warning header, as specified in [RFC3261] section 7.3.1. The value of the Warning header MUST be constructed as follows:

  • Warn-code is set to the value 313.

  • Warn-agent is set to the value "lcs.microsoft.com".

  • Warn-text is set to the static location information that is configured for this version of the UAC. Typically, the client prompts the user to go to this location to download a newer version of the client. This information is an HTTP or HTTPS URI where the client version can be downloaded.

The following is an example of this Warning header.

 Warning: 313 lcs.microsoft.com http://fabrikam.com