Note: It is necessary to have a default value for the variable, in order to preview the results of the filter operation.
注意:该变量需要有一个默认值,以便预览过滤操作的结果。
Note that normally you will configure SIF as the first filter in the filter chain.
注意:通常将SIF配置为过滤器链中第一个过滤器。
Note that the filter is case sensitive.
请注意过滤器是区分大小写的。
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