Verify the extraction rule results.
验证该提取规则的结果。
RequiredGets or sets a value that indicates whether the extraction rule should fail if the value to be extracted is not found in the response.
获取或设置一个值，该值表示具有要提取值的特性的名称。
The validation and extraction rule walkthrough and the data binding walkthrough can be completed in any order after the first two walkthroughs.
在前两个演练之后，可以按照任意顺序完成验证和提取规则演练以及数据绑定演练。
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