Content-Type对照表

    ["application/x-dosexec"] = "exe",
    ["application/msword"] = "doc",
    ["application/x-dmg"] = "dmg",
    ["application/x-gzip"] = "gz",
    ["application/x-rar"] = "rar",
    ["application/x-tar"] = "tar",
    ["application/x-xar"] = "pkg",
    ["application/x-rpm"] = "rpm",
    ["application/x-stuffit"] = "sif",
    ["application/x-archive"] = "",
    ["application/x-arc"] = "arc",
    ["application/x-eet"] = "eet",
    ["application/x-zoo"] = "zoo",
    ["application/x-lz4"] = "lz4",
    ["application/x-lrzip"] = "lrz",
    ["application/x-lzh"] = "lzh",
    ["application/warc"] = "warc",
    ["application/x-7z-compressed"] ="7z",
    ["application/x-xz"] = "xz",
    ["application/x-lha"] = "lha",
    ["application/x-arj"] = "arj",
    ["application/x-cpio"] = "cpio",
    ["application/x-compress"] = "",
    ["application/x-lzma"] = "",
    ["application/zip"] = "zip",
    ["application/vnd.ms-cab-compressed"] = "cab",
    ["application/pdf"] = "pdf",
    ["application/vnd.openxmlformats-officedocument.wordprocessingml.document"] = "docx",
    ["application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"] = "xlsx",
    ["application/vnd.openxmlformats-officedocument.presentationml.presentation"] ="pptx",
    ["application/font-woff"] = "woff",
    ["application/x-font-ttf"] = "ttf",
    ["application/vnd.ms-fontobject"] = "eot",
    ["application/x-font-sfn"] = "",
    ["application/vnd.ms-opentype"] = "otf",
    ["application/x-mif"] = "mif",
    ["application/vnd.font-fontforge-sfd"] = "sfd",
    ["audio/mpeg"] = "mp3",
    ["audo/m4a"] = "mp4",
    ["image/tiff"] = "tiff",
    ["image/gif"] = "gif",
    ["image/jpeg"] = "jpg",
    ["image/x-ms-bmp"] = "bmp",
    ["image/x-icon"] = "ico",
    ["image/x-cursor"] = "cur",
    ["image/vnd.adobe.photoshop"] = "pnd",
    ["image/png"] = "png",
    ["text/html"] = "html",
    ["text/plain"] = "txt",
    ["text/json"] = "json",
    ["text/rtf"] = "rtf",
    ["application/xml"] = "xml",
    ["text/rss"] = "rss",
    ["application/java-archive"] = "jar",
    ["application/x-java-applet"] = "jar",
    ["application/x-shockwave-flash"] = "swf",
    ["application/pkcs7-signature"] = "p7",
    ["application/x-pem"] = "pem",
    ["application/x-java-jnlp-file"] = "jnlp",
    ["application/vnd.tcpdump.pcap"] = "pcap",
    ["text/x-shellscript"] = "sh",
    ["text/x-perl"] = "pl",
    ["text/x-ruby"] = "rb",
    ["text/x-python"] = "py",
    ["text/x-awk"] = "awk",
    ["text/x-lua"] ="lua",
    ["application/javascript"] = "js",
    ["text/x-php"] = "php",
    ["application/x-executable"] = "",
    ["application/x-coredump"] = "core",
    ["video/x-flv"] = "flv",
    ["video/x-fli"] = "fli",
    ["video/x-flc"] = "flc",
    ["video/mj2"] = "mj2",
    ["video/x-mng"] = "mng",
    ["video/x-jng"] = "jng",
    ["video/mpeg"] = "mpg",
    ["video/mpv"] = "mpv",
    ["video/h264"] = "264",
    ["video/webm"] = "webm",
    ["video/matroska"] = "mkv",
    ["vidoe/x-sgi-movie"] = "sgi",
    ["video/quicktime"] = "qt",
    ["video/mp4"] = "mp4",
    ["video/3gpp"] = "3gp",