如果没有可用航班，则客户端与服务之间的交互必须停止。
If flights are not available, then the client-service interaction must stop.
Accept： Accept请求标头字段可用来指定客户端可以接受的特定媒体类型响应。
Accept: the accept request-header field can be used to specify certain media types responses that are acceptable to the client.
在此身份验证信息交换过程中生成的会话密钥可用于客户端/服务器与 KDC 之间的所有未来通信。
The session keys generated during this authentication exchange can be used for all the future correspondences among client/server and KDC.
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