Verify that the subscription header format is correct for this handler implementation.

检验订阅消息头的格式是否适合于这种处理程序实现。

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The routing handler extracts the token and routes the message based on the membership level it represents. The following header format is used.

路由处理器摘取出这个令牌符号，并且会根据它代表的成员资格级别来路由这个消息。

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They can also examine the version identifier and determine if they understand the header format. If they do not understand the format they can either.

它们还能检查版本标识符并确定它们是否了解消息头的格式。

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