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scawlspider为什么不能传参META?

用scawlspider写了个爬虫,爬一个列表页A和一个详情页B。
在A ITEM对像中REQUEST META传参CALLBACK给B
B接受A,RESPONSE META,但怎么试都报错:keyError
折腾了一天,用回scawl爬虫,同样代码,顺利可以传参META。
这是为什么呢?


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