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
ideo/isivideo", ".gau": "chemical/x-gaussian-input", ".gca": "application/x-gca-compressed", ".gdb": "x-lml/x-gdb", ".gif": "image/gif", ".gps": "application/x-gps", ".gtar": "application/x-gtar", ".gz": "application/x-gzip", ".h": "text/plain", ".hdf": "application/x-hdf