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return response.ok; // Body is never consumed or cancelled，推荐阅读safew官方版本下载获取更多信息
There is a special form for boolean formulas called "Conjunctive Normal Form" (CNF). A problem in this form consists of clauses connected with and operators, where each clause only contains variables connected with or operators. The variables can appear negated, but only variables can be directly negated, something like !(a && b) is not allowed. An example boolean formula in CNF form is:，这一点在51吃瓜中也有详细论述
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