--- /dev/null
+package oss
+
+import (
+ "mime"
+ "path"
+ "strings"
+)
+
+var extToMimeType = map[string]string{
+ ".xlsx": "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
+ ".xltx": "application/vnd.openxmlformats-officedocument.spreadsheetml.template",
+ ".potx": "application/vnd.openxmlformats-officedocument.presentationml.template",
+ ".ppsx": "application/vnd.openxmlformats-officedocument.presentationml.slideshow",
+ ".pptx": "application/vnd.openxmlformats-officedocument.presentationml.presentation",
+ ".sldx": "application/vnd.openxmlformats-officedocument.presentationml.slide",
+ ".docx": "application/vnd.openxmlformats-officedocument.wordprocessingml.document",
+ ".dotx": "application/vnd.openxmlformats-officedocument.wordprocessingml.template",
+ ".xlam": "application/vnd.ms-excel.addin.macroEnabled.12",
+ ".xlsb": "application/vnd.ms-excel.sheet.binary.macroEnabled.12",
+ ".apk": "application/vnd.android.package-archive",
+ ".hqx": "application/mac-binhex40",
+ ".cpt": "application/mac-compactpro",
+ ".doc": "application/msword",
+ ".ogg": "application/ogg",
+ ".pdf": "application/pdf",
+ ".rtf": "text/rtf",
+ ".mif": "application/vnd.mif",
+ ".xls": "application/vnd.ms-excel",
+ ".ppt": "application/vnd.ms-powerpoint",
+ ".odc": "application/vnd.oasis.opendocument.chart",
+ ".odb": "application/vnd.oasis.opendocument.database",
+ ".odf": "application/vnd.oasis.opendocument.formula",
+ ".odg": "application/vnd.oasis.opendocument.graphics",
+ ".otg": "application/vnd.oasis.opendocument.graphics-template",
+ ".odi": "application/vnd.oasis.opendocument.image",
+ ".odp": "application/vnd.oasis.opendocument.presentation",
+ ".otp": "application/vnd.oasis.opendocument.presentation-template",
+ ".ods": "application/vnd.oasis.opendocument.spreadsheet",
+ ".ots": "application/vnd.oasis.opendocument.spreadsheet-template",
+ ".odt": "application/vnd.oasis.opendocument.text",
+ ".odm": "application/vnd.oasis.opendocument.text-master",
+ ".ott": "application/vnd.oasis.opendocument.text-template",
+ ".oth": "application/vnd.oasis.opendocument.text-web",
+ ".sxw": "application/vnd.sun.xml.writer",
+ ".stw": "application/vnd.sun.xml.writer.template",
+ ".sxc": "application/vnd.sun.xml.calc",
+ ".stc": "application/vnd.sun.xml.calc.template",
+ ".sxd": "application/vnd.sun.xml.draw",
+ ".std": "application/vnd.sun.xml.draw.template",
+ ".sxi": "application/vnd.sun.xml.impress",
+ ".sti": "application/vnd.sun.xml.impress.template",
+ ".sxg": "application/vnd.sun.xml.writer.global",
+ ".sxm": "application/vnd.sun.xml.math",
+ ".sis": "application/vnd.symbian.install",
+ ".wbxml": "application/vnd.wap.wbxml",
+ ".wmlc": "application/vnd.wap.wmlc",
+ ".wmlsc": "application/vnd.wap.wmlscriptc",
+ ".bcpio": "application/x-bcpio",
+ ".torrent": "application/x-bittorrent",
+ ".bz2": "application/x-bzip2",
+ ".vcd": "application/x-cdlink",
+ ".pgn": "application/x-chess-pgn",
+ ".cpio": "application/x-cpio",
+ ".csh": "application/x-csh",
+ ".dvi": "application/x-dvi",
+ ".spl": "application/x-futuresplash",
+ ".gtar": "application/x-gtar",
+ ".hdf": "application/x-hdf",
+ ".jar": "application/x-java-archive",
+ ".jnlp": "application/x-java-jnlp-file",
+ ".js": "application/x-javascript",
+ ".ksp": "application/x-kspread",
+ ".chrt": "application/x-kchart",
+ ".kil": "application/x-killustrator",
+ ".latex": "application/x-latex",
+ ".rpm": "application/x-rpm",
+ ".sh": "application/x-sh",
+ ".shar": "application/x-shar",
+ ".swf": "application/x-shockwave-flash",
+ ".sit": "application/x-stuffit",
+ ".sv4cpio": "application/x-sv4cpio",
+ ".sv4crc": "application/x-sv4crc",
+ ".tar": "application/x-tar",
+ ".tcl": "application/x-tcl",
+ ".tex": "application/x-tex",
+ ".man": "application/x-troff-man",
+ ".me": "application/x-troff-me",
+ ".ms": "application/x-troff-ms",
+ ".ustar": "application/x-ustar",
+ ".src": "application/x-wais-source",
+ ".zip": "application/zip",
+ ".m3u": "audio/x-mpegurl",
+ ".ra": "audio/x-pn-realaudio",
+ ".wav": "audio/x-wav",
+ ".wma": "audio/x-ms-wma",
+ ".wax": "audio/x-ms-wax",
+ ".pdb": "chemical/x-pdb",
+ ".xyz": "chemical/x-xyz",
+ ".bmp": "image/bmp",
+ ".gif": "image/gif",
+ ".ief": "image/ief",
+ ".png": "image/png",
+ ".wbmp": "image/vnd.wap.wbmp",
+ ".ras": "image/x-cmu-raster",
+ ".pnm": "image/x-portable-anymap",
+ ".pbm": "image/x-portable-bitmap",
+ ".pgm": "image/x-portable-graymap",
+ ".ppm": "image/x-portable-pixmap",
+ ".rgb": "image/x-rgb",
+ ".xbm": "image/x-xbitmap",
+ ".xpm": "image/x-xpixmap",
+ ".xwd": "image/x-xwindowdump",
+ ".css": "text/css",
+ ".rtx": "text/richtext",
+ ".tsv": "text/tab-separated-values",
+ ".jad": "text/vnd.sun.j2me.app-descriptor",
+ ".wml": "text/vnd.wap.wml",
+ ".wmls": "text/vnd.wap.wmlscript",
+ ".etx": "text/x-setext",
+ ".mxu": "video/vnd.mpegurl",
+ ".flv": "video/x-flv",
+ ".wm": "video/x-ms-wm",
+ ".wmv": "video/x-ms-wmv",
+ ".wmx": "video/x-ms-wmx",
+ ".wvx": "video/x-ms-wvx",
+ ".avi": "video/x-msvideo",
+ ".movie": "video/x-sgi-movie",
+ ".ice": "x-conference/x-cooltalk",
+ ".3gp": "video/3gpp",
+ ".ai": "application/postscript",
+ ".aif": "audio/x-aiff",
+ ".aifc": "audio/x-aiff",
+ ".aiff": "audio/x-aiff",
+ ".asc": "text/plain",
+ ".atom": "application/atom+xml",
+ ".au": "audio/basic",
+ ".bin": "application/octet-stream",
+ ".cdf": "application/x-netcdf",
+ ".cgm": "image/cgm",
+ ".class": "application/octet-stream",
+ ".dcr": "application/x-director",
+ ".dif": "video/x-dv",
+ ".dir": "application/x-director",
+ ".djv": "image/vnd.djvu",
+ ".djvu": "image/vnd.djvu",
+ ".dll": "application/octet-stream",
+ ".dmg": "application/octet-stream",
+ ".dms": "application/octet-stream",
+ ".dtd": "application/xml-dtd",
+ ".dv": "video/x-dv",
+ ".dxr": "application/x-director",
+ ".eps": "application/postscript",
+ ".exe": "application/octet-stream",
+ ".ez": "application/andrew-inset",
+ ".gram": "application/srgs",
+ ".grxml": "application/srgs+xml",
+ ".gz": "application/x-gzip",
+ ".htm": "text/html",
+ ".html": "text/html",
+ ".ico": "image/x-icon",
+ ".ics": "text/calendar",
+ ".ifb": "text/calendar",
+ ".iges": "model/iges",
+ ".igs": "model/iges",
+ ".jp2": "image/jp2",
+ ".jpe": "image/jpeg",
+ ".jpeg": "image/jpeg",
+ ".jpg": "image/jpeg",
+ ".kar": "audio/midi",
+ ".lha": "application/octet-stream",
+ ".lzh": "application/octet-stream",
+ ".m4a": "audio/mp4a-latm",
+ ".m4p": "audio/mp4a-latm",
+ ".m4u": "video/vnd.mpegurl",
+ ".m4v": "video/x-m4v",
+ ".mac": "image/x-macpaint",
+ ".mathml": "application/mathml+xml",
+ ".mesh": "model/mesh",
+ ".mid": "audio/midi",
+ ".midi": "audio/midi",
+ ".mov": "video/quicktime",
+ ".mp2": "audio/mpeg",
+ ".mp3": "audio/mpeg",
+ ".mp4": "video/mp4",
+ ".mpe": "video/mpeg",
+ ".mpeg": "video/mpeg",
+ ".mpg": "video/mpeg",
+ ".mpga": "audio/mpeg",
+ ".msh": "model/mesh",
+ ".nc": "application/x-netcdf",
+ ".oda": "application/oda",
+ ".ogv": "video/ogv",
+ ".pct": "image/pict",
+ ".pic": "image/pict",
+ ".pict": "image/pict",
+ ".pnt": "image/x-macpaint",
+ ".pntg": "image/x-macpaint",
+ ".ps": "application/postscript",
+ ".qt": "video/quicktime",
+ ".qti": "image/x-quicktime",
+ ".qtif": "image/x-quicktime",
+ ".ram": "audio/x-pn-realaudio",
+ ".rdf": "application/rdf+xml",
+ ".rm": "application/vnd.rn-realmedia",
+ ".roff": "application/x-troff",
+ ".sgm": "text/sgml",
+ ".sgml": "text/sgml",
+ ".silo": "model/mesh",
+ ".skd": "application/x-koan",
+ ".skm": "application/x-koan",
+ ".skp": "application/x-koan",
+ ".skt": "application/x-koan",
+ ".smi": "application/smil",
+ ".smil": "application/smil",
+ ".snd": "audio/basic",
+ ".so": "application/octet-stream",
+ ".svg": "image/svg+xml",
+ ".t": "application/x-troff",
+ ".texi": "application/x-texinfo",
+ ".texinfo": "application/x-texinfo",
+ ".tif": "image/tiff",
+ ".tiff": "image/tiff",
+ ".tr": "application/x-troff",
+ ".txt": "text/plain",
+ ".vrml": "model/vrml",
+ ".vxml": "application/voicexml+xml",
+ ".webm": "video/webm",
+ ".wrl": "model/vrml",
+ ".xht": "application/xhtml+xml",
+ ".xhtml": "application/xhtml+xml",
+ ".xml": "application/xml",
+ ".xsl": "application/xml",
+ ".xslt": "application/xslt+xml",
+ ".xul": "application/vnd.mozilla.xul+xml",
+ ".webp": "image/webp",
+ ".323": "text/h323",
+ ".aab": "application/x-authoware-bin",
+ ".aam": "application/x-authoware-map",
+ ".aas": "application/x-authoware-seg",
+ ".acx": "application/internet-property-stream",
+ ".als": "audio/X-Alpha5",
+ ".amc": "application/x-mpeg",
+ ".ani": "application/octet-stream",
+ ".asd": "application/astound",
+ ".asf": "video/x-ms-asf",
+ ".asn": "application/astound",
+ ".asp": "application/x-asap",
+ ".asr": "video/x-ms-asf",
+ ".asx": "video/x-ms-asf",
+ ".avb": "application/octet-stream",
+ ".awb": "audio/amr-wb",
+ ".axs": "application/olescript",
+ ".bas": "text/plain",
+ ".bin ": "application/octet-stream",
+ ".bld": "application/bld",
+ ".bld2": "application/bld2",
+ ".bpk": "application/octet-stream",
+ ".c": "text/plain",
+ ".cal": "image/x-cals",
+ ".cat": "application/vnd.ms-pkiseccat",
+ ".ccn": "application/x-cnc",
+ ".cco": "application/x-cocoa",
+ ".cer": "application/x-x509-ca-cert",
+ ".cgi": "magnus-internal/cgi",
+ ".chat": "application/x-chat",
+ ".clp": "application/x-msclip",
+ ".cmx": "image/x-cmx",
+ ".co": "application/x-cult3d-object",
+ ".cod": "image/cis-cod",
+ ".conf": "text/plain",
+ ".cpp": "text/plain",
+ ".crd": "application/x-mscardfile",
+ ".crl": "application/pkix-crl",
+ ".crt": "application/x-x509-ca-cert",
+ ".csm": "chemical/x-csml",
+ ".csml": "chemical/x-csml",
+ ".cur": "application/octet-stream",
+ ".dcm": "x-lml/x-evm",
+ ".dcx": "image/x-dcx",
+ ".der": "application/x-x509-ca-cert",
+ ".dhtml": "text/html",
+ ".dot": "application/msword",
+ ".dwf": "drawing/x-dwf",
+ ".dwg": "application/x-autocad",
+ ".dxf": "application/x-autocad",
+ ".ebk": "application/x-expandedbook",
+ ".emb": "chemical/x-embl-dl-nucleotide",
+ ".embl": "chemical/x-embl-dl-nucleotide",
+ ".epub": "application/epub+zip",
+ ".eri": "image/x-eri",
+ ".es": "audio/echospeech",
+ ".esl": "audio/echospeech",
+ ".etc": "application/x-earthtime",
+ ".evm": "x-lml/x-evm",
+ ".evy": "application/envoy",
+ ".fh4": "image/x-freehand",
+ ".fh5": "image/x-freehand",
+ ".fhc": "image/x-freehand",
+ ".fif": "application/fractals",
+ ".flr": "x-world/x-vrml",
+ ".fm": "application/x-maker",
+ ".fpx": "image/x-fpx",
+ ".fvi": "video/isivideo",
+ ".gau": "chemical/x-gaussian-input",
+ ".gca": "application/x-gca-compressed",
+ ".gdb": "x-lml/x-gdb",
+ ".gps": "application/x-gps",
+ ".h": "text/plain",
+ ".hdm": "text/x-hdml",
+ ".hdml": "text/x-hdml",
+ ".hlp": "application/winhlp",
+ ".hta": "application/hta",
+ ".htc": "text/x-component",
+ ".hts": "text/html",
+ ".htt": "text/webviewhtml",
+ ".ifm": "image/gif",
+ ".ifs": "image/ifs",
+ ".iii": "application/x-iphone",
+ ".imy": "audio/melody",
+ ".ins": "application/x-internet-signup",
+ ".ips": "application/x-ipscript",
+ ".ipx": "application/x-ipix",
+ ".isp": "application/x-internet-signup",
+ ".it": "audio/x-mod",
+ ".itz": "audio/x-mod",
+ ".ivr": "i-world/i-vrml",
+ ".j2k": "image/j2k",
+ ".jam": "application/x-jam",
+ ".java": "text/plain",
+ ".jfif": "image/pipeg",
+ ".jpz": "image/jpeg",
+ ".jwc": "application/jwc",
+ ".kjx": "application/x-kjx",
+ ".lak": "x-lml/x-lak",
+ ".lcc": "application/fastman",
+ ".lcl": "application/x-digitalloca",
+ ".lcr": "application/x-digitalloca",
+ ".lgh": "application/lgh",
+ ".lml": "x-lml/x-lml",
+ ".lmlpack": "x-lml/x-lmlpack",
+ ".log": "text/plain",
+ ".lsf": "video/x-la-asf",
+ ".lsx": "video/x-la-asf",
+ ".m13": "application/x-msmediaview",
+ ".m14": "application/x-msmediaview",
+ ".m15": "audio/x-mod",
+ ".m3url": "audio/x-mpegurl",
+ ".m4b": "audio/mp4a-latm",
+ ".ma1": "audio/ma1",
+ ".ma2": "audio/ma2",
+ ".ma3": "audio/ma3",
+ ".ma5": "audio/ma5",
+ ".map": "magnus-internal/imagemap",
+ ".mbd": "application/mbedlet",
+ ".mct": "application/x-mascot",
+ ".mdb": "application/x-msaccess",
+ ".mdz": "audio/x-mod",
+ ".mel": "text/x-vmel",
+ ".mht": "message/rfc822",
+ ".mhtml": "message/rfc822",
+ ".mi": "application/x-mif",
+ ".mil": "image/x-cals",
+ ".mio": "audio/x-mio",
+ ".mmf": "application/x-skt-lbs",
+ ".mng": "video/x-mng",
+ ".mny": "application/x-msmoney",
+ ".moc": "application/x-mocha",
+ ".mocha": "application/x-mocha",
+ ".mod": "audio/x-mod",
+ ".mof": "application/x-yumekara",
+ ".mol": "chemical/x-mdl-molfile",
+ ".mop": "chemical/x-mopac-input",
+ ".mpa": "video/mpeg",
+ ".mpc": "application/vnd.mpohun.certificate",
+ ".mpg4": "video/mp4",
+ ".mpn": "application/vnd.mophun.application",
+ ".mpp": "application/vnd.ms-project",
+ ".mps": "application/x-mapserver",
+ ".mpv2": "video/mpeg",
+ ".mrl": "text/x-mrml",
+ ".mrm": "application/x-mrm",
+ ".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/nbmp",
+ ".ndb": "x-lml/x-ndb",
+ ".ndwn": "application/ndwn",
+ ".nif": "application/x-nif",
+ ".nmz": "application/x-scream",
+ ".nokia-op-logo": "image/vnd.nok-oplogo-color",
+ ".npx": "application/x-netfpx",
+ ".nsnd": "audio/nsnd",
+ ".nva": "application/x-neva1",
+ ".nws": "message/rfc822",
+ ".oom": "application/x-AtlasMate-Plugin",
+ ".p10": "application/pkcs10",
+ ".p12": "application/x-pkcs12",
+ ".p7b": "application/x-pkcs7-certificates",
+ ".p7c": "application/x-pkcs7-mime",
+ ".p7m": "application/x-pkcs7-mime",
+ ".p7r": "application/x-pkcs7-certreqresp",
+ ".p7s": "application/x-pkcs7-signature",
+ ".pac": "audio/x-pac",
+ ".pae": "audio/x-epac",
+ ".pan": "application/x-pan",
+ ".pcx": "image/x-pcx",
+ ".pda": "image/x-pda",
+ ".pfr": "application/font-tdpfr",
+ ".pfx": "application/x-pkcs12",
+ ".pko": "application/ynd.ms-pkipko",
+ ".pm": "application/x-perl",
+ ".pma": "application/x-perfmon",
+ ".pmc": "application/x-perfmon",
+ ".pmd": "application/x-pmd",
+ ".pml": "application/x-perfmon",
+ ".pmr": "application/x-perfmon",
+ ".pmw": "application/x-perfmon",
+ ".pnz": "image/png",
+ ".pot,": "application/vnd.ms-powerpoint",
+ ".pps": "application/vnd.ms-powerpoint",
+ ".pqf": "application/x-cprplayer",
+ ".pqi": "application/cprplayer",
+ ".prc": "application/x-prc",
+ ".prf": "application/pics-rules",
+ ".prop": "text/plain",
+ ".proxy": "application/x-ns-proxy-autoconfig",
+ ".ptlk": "application/listenup",
+ ".pub": "application/x-mspublisher",
+ ".pvx": "video/x-pv-pvx",
+ ".qcp": "audio/vnd.qcelp",
+ ".r3t": "text/vnd.rn-realtext3d",
+ ".rar": "application/octet-stream",
+ ".rc": "text/plain",
+ ".rf": "image/vnd.rn-realflash",
+ ".rlf": "application/x-richlink",
+ ".rmf": "audio/x-rmf",
+ ".rmi": "audio/mid",
+ ".rmm": "audio/x-pn-realaudio",
+ ".rmvb": "audio/x-pn-realaudio",
+ ".rnx": "application/vnd.rn-realplayer",
+ ".rp": "image/vnd.rn-realpix",
+ ".rt": "text/vnd.rn-realtext",
+ ".rte": "x-lml/x-gps",
+ ".rtg": "application/metastream",
+ ".rv": "video/vnd.rn-realvideo",
+ ".rwc": "application/x-rogerwilco",
+ ".s3m": "audio/x-mod",
+ ".s3z": "audio/x-mod",
+ ".sca": "application/x-supercard",
+ ".scd": "application/x-msschedule",
+ ".sct": "text/scriptlet",
+ ".sdf": "application/e-score",
+ ".sea": "application/x-stuffit",
+ ".setpay": "application/set-payment-initiation",
+ ".setreg": "application/set-registration-initiation",
+ ".shtml": "text/html",
+ ".shtm": "text/html",
+ ".shw": "application/presentations",
+ ".si6": "image/si6",
+ ".si7": "image/vnd.stiwap.sis",
+ ".si9": "image/vnd.lgtwap.sis",
+ ".slc": "application/x-salsa",
+ ".smd": "audio/x-smd",
+ ".smp": "application/studiom",
+ ".smz": "audio/x-smd",
+ ".spc": "application/x-pkcs7-certificates",
+ ".spr": "application/x-sprite",
+ ".sprite": "application/x-sprite",
+ ".sdp": "application/sdp",
+ ".spt": "application/x-spt",
+ ".sst": "application/vnd.ms-pkicertstore",
+ ".stk": "application/hyperstudio",
+ ".stl": "application/vnd.ms-pkistl",
+ ".stm": "text/html",
+ ".svf": "image/vnd",
+ ".svh": "image/svh",
+ ".svr": "x-world/x-svr",
+ ".swfl": "application/x-shockwave-flash",
+ ".tad": "application/octet-stream",
+ ".talk": "text/x-speech",
+ ".taz": "application/x-tar",
+ ".tbp": "application/x-timbuktu",
+ ".tbt": "application/x-timbuktu",
+ ".tgz": "application/x-compressed",
+ ".thm": "application/vnd.eri.thm",
+ ".tki": "application/x-tkined",
+ ".tkined": "application/x-tkined",
+ ".toc": "application/toc",
+ ".toy": "image/toy",
+ ".trk": "x-lml/x-gps",
+ ".trm": "application/x-msterminal",
+ ".tsi": "audio/tsplayer",
+ ".tsp": "application/dsptype",
+ ".ttf": "application/octet-stream",
+ ".ttz": "application/t-time",
+ ".uls": "text/iuls",
+ ".ult": "audio/x-mod",
+ ".uu": "application/x-uuencode",
+ ".uue": "application/x-uuencode",
+ ".vcf": "text/x-vcard",
+ ".vdo": "video/vdo",
+ ".vib": "audio/vib",
+ ".viv": "video/vivo",
+ ".vivo": "video/vivo",
+ ".vmd": "application/vocaltec-media-desc",
+ ".vmf": "application/vocaltec-media-file",
+ ".vmi": "application/x-dreamcast-vms-info",
+ ".vms": "application/x-dreamcast-vms",
+ ".vox": "audio/voxware",
+ ".vqe": "audio/x-twinvq-plugin",
+ ".vqf": "audio/x-twinvq",
+ ".vql": "audio/x-twinvq",
+ ".vre": "x-world/x-vream",
+ ".vrt": "x-world/x-vrt",
+ ".vrw": "x-world/x-vream",
+ ".vts": "workbook/formulaone",
+ ".wcm": "application/vnd.ms-works",
+ ".wdb": "application/vnd.ms-works",
+ ".web": "application/vnd.xara",
+ ".wi": "image/wavelet",
+ ".wis": "application/x-InstallShield",
+ ".wks": "application/vnd.ms-works",
+ ".wmd": "application/x-ms-wmd",
+ ".wmf": "application/x-msmetafile",
+ ".wmlscript": "text/vnd.wap.wmlscript",
+ ".wmz": "application/x-ms-wmz",
+ ".wpng": "image/x-up-wpng",
+ ".wps": "application/vnd.ms-works",
+ ".wpt": "x-lml/x-gps",
+ ".wri": "application/x-mswrite",
+ ".wrz": "x-world/x-vrml",
+ ".ws": "text/vnd.wap.wmlscript",
+ ".wsc": "application/vnd.wap.wmlscriptc",
+ ".wv": "video/wavelet",
+ ".wxl": "application/x-wxl",
+ ".x-gzip": "application/x-gzip",
+ ".xaf": "x-world/x-vrml",
+ ".xar": "application/vnd.xara",
+ ".xdm": "application/x-xdma",
+ ".xdma": "application/x-xdma",
+ ".xdw": "application/vnd.fujixerox.docuworks",
+ ".xhtm": "application/xhtml+xml",
+ ".xla": "application/vnd.ms-excel",
+ ".xlc": "application/vnd.ms-excel",
+ ".xll": "application/x-excel",
+ ".xlm": "application/vnd.ms-excel",
+ ".xlt": "application/vnd.ms-excel",
+ ".xlw": "application/vnd.ms-excel",
+ ".xm": "audio/x-mod",
+ ".xmz": "audio/x-mod",
+ ".xof": "x-world/x-vrml",
+ ".xpi": "application/x-xpinstall",
+ ".xsit": "text/xml",
+ ".yz1": "application/x-yz1",
+ ".z": "application/x-compress",
+ ".zac": "application/x-zaurus-zac",
+ ".json": "application/json",
+}
+
+// TypeByExtension returns the MIME type associated with the file extension ext.
+// gets the file's MIME type for HTTP header Content-Type
+func TypeByExtension(filePath string) string {
+ typ := mime.TypeByExtension(path.Ext(filePath))
+ if typ == "" {
+ typ = extToMimeType[strings.ToLower(path.Ext(filePath))]
+ }
+ return typ
+}
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