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
rt", ".vrw": "x-world/x-vream", ".vts": "workbook/formulaone", ".wav": "audio/x-wav", ".wax": "audio/x-ms-wax", ".wbmp": "image/vnd.wap.wbmp", ".wcm": "application/vnd.ms-works", ".wdb": "application/vnd.ms-works", ".web": "application/vnd.xara", ".wi": "image/wavelet",