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
ation/x-troff-ms", ".msg": "application/vnd.ms-outlook", ".mts": "application/metastream", ".mtx": "application/metastream", ".mtz": "application/metastream", ".mvb": "application/x-msmediaview", ".mzv": "application/metastream", ".nar": "application/zip", ".nbmp": "image/nb