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3.4.2.5.3 Sending 403 Forbidden response (Action: Block client with prompt)

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If the server (2) determines that it does not support the version specified in the User-Agent header, and if the action that is configured for the client is to prompt, such as when there is no location configured to download newer clients, the server (2) SHOULD respond with a 403 Forbidden error. In this case, the server (2) 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 310.
Warn-agent is set to the value "lcs.microsoft.com".
Warn-text is set to the quoted string "You are currently not using the recommended version of the client".

The following is an example of a Warning header:

Warning: 310 lcs.microsoft.com "You are currently not using the recommended version of the client"

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