In case the user's choice of news type was invalid, the model would return an error code, rather than the headlines.

在用户选择的新闻类型无效的情况下，模型将返回一个错误代码，而不是返回标题。

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An invalid media type should return an HTTP response code of 406.

无效媒体类型应返回一个HTTP响应代码406。

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Be sure to incorporate some type of error-handling strategy to handle the chance of client code passing in an invalid index value.

确保结合某一类型的错误处理策略，以处理万一客户端代码传入无效索引值的情况。

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Be sure to incorporate some type of error-handling strategy to handle the chance of client code passing in an invalid index value.

确保结合某一类型的错误处理策略，以处理万一客户端代码传入无效索引值的情况。

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