Keyword list:
[ method: "", path: "", resp_body: "", status: nil ]
事实上其内部表示形式为：
[ {:method, ""}, {:path, ""}, {:resp_body, ""}, {:status, nil} ]
总结：keyword list 实际是Tuple list, 明确的说就是只有一个key的元组的list
Keyword list:
[ method: "", path: "", resp_body: "", status: nil ]
事实上其内部表示形式为：
[ {:method, ""}, {:path, ""}, {:resp_body, ""}, {:status, nil} ]
总结：keyword list 实际是Tuple list, 明确的说就是只有一个key的元组的list
