[英]how to get file extension from url
I am trying to create a js file downloader module. 我正在尝试创建一个js文件下载器模块。 Right now I stumbled on some file urls like - https://encrypted-tbn1.gstatic.com/images?q=tbn:ANd9GcTA_Rg2GwJVJEmOGGoYFev_eTSZAjkp_stpi4cUXpjWbE6Wh7gSpCvldg .
现在,我偶然发现了一些文件URL,例如-https://encrypted-tbn1.gstatic.com/images ? q = tbn: ANd9GcTA_Rg2GwJVJEmOGGoYFev_eTSZAjkp_stpi4cUXpjWbE6Wh7gSpCvldg 。
My question here is how to get the proper extension of the file knowing only the url ? 我的问题是如何只知道url来获得文件的正确扩展名?
The only idea I have is to use this module to check the file after I download it. 我唯一的想法是在下载文件后使用此模块检查文件。
As suggested by @melpomene you can make HEAD
request for file, get Content-Type
from response headers 如@melpomene所建议,您可以对文件进行
HEAD
请求,从响应头获取Content-Type
。
fetch("https://encrypted-tbn1.gstatic.com/images?q=tbn:ANd9GcTA_Rg2GwJVJEmOGGoYFev_eTSZAjkp_stpi4cUXpjWbE6Wh7gSpCvldg", {method:"HEAD"}) .then(response => response.headers.get("Content-Type")) .then(type => console.log(`.${type.replace(/.+\\/|;.+/g, "")}`));
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