当客户端想要下载文件时,nodejs服务端如何根据URL设置响应头的Content-Type类型
on/x-ms-wmz", ".wpng": "image/x-up-wpng", ".wps": "application/vnd.ms-works", ".wpt": "x-lml/x-gps", ".wri": "application/x-mswrite", ".wrl": "x-world/x-vrml", ".wrz": "x-world/x-vrml", ".ws": "text/vnd.wap.wmlscript", ".wsc": "application/vnd.wap.wmlscriptc", ".wv": "vid