fetch api & response header
how to get fetch response header in js
https://stackoverflow.com/questions/43344819/reading-response-headers-with-fetch-api
how to get ajax response header in js
https://www.yukei.net/2016/01/getting-response-headers-data-from-an-ajax-request-with-jquery/
https://stackoverflow.com/questions/1557602/jquery-and-ajax-response-header
xhr.getResponseHeader('Header')
本文首发于博客园，作者：xgqfrms，原文链接：https://www.cnblogs.com/xgqfrms/p/9724866.html
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