HTTPの実装では、ファイルの拡張子ごとにブラウザが受け取ったときのアクションが決まっています。
この機能をMIMEタイプといい、MIMEタイプの設定されていないファイルを受け取った場合には、
ブラウザは何をすべきかが分からずファイルのダウンロードを始めます。
以下が対応しているMIMEタイプの一覧です。
| 拡張子 | MIME タイプ |
|---|---|
| .ez | application/andrew-inset |
| .atom | application/atom+xml |
| .atomcat | application/atomcat+xml |
| .atomsvc | application/atomsvc+xml |
| .ccxml | application/ccxml+xml |
| .davmount | application/davmount+xml |
| .ecma | application/ecmascript |
| .pfr | application/font-tdpfr |
| .stk | application/hyperstudio |
| .js | application/javascript |
| .json | application/json |
| .hqx | application/mac-binhex40 |
| .cpt | application/mac-compactpro |
| .mrc | application/marc |
| .ma .nb .mb | application/mathematica |
| .mathml | application/mathml+xml |
| .mbox | application/mbox |
| .mscml | application/mediaservercontrol+xml |
| .mp4s | application/mp4 |
| .doc .dot | application/msword |
| .mxf | application/mxf |
| .bin .dms .lha .lzh .class .so .iso .dmg .dist .distz .pkg .bpk .dump .elc | application/octet-stream |
| .oda | application/oda |
| .ogg | application/ogg |
| application/pdf | |
| .pgp | application/pgp-encrypted |
| .asc .sig | application/pgp-signature |
| .prf | application/pics-rules |
| .p10 | application/pkcs10 |
| .p7m .p7c | application/pkcs7-mime |
| .p7s | application/pkcs7-signature |
| .cer | application/pkix-cert |
| .crl | application/pkix-crl |
| .pkipath | application/pkix-pkipath |
| .pki | application/pkixcmp |
| .pls | application/pls+xml |
| .ai .eps .ps | application/postscript |
| .cww | application/prs.cww |
| .rdf | application/rdf+xml |
| .rif | application/reginfo+xml |
| .rnc | application/relax-ng-compact-syntax |
| .rl | application/resource-lists+xml |
| .rs | application/rls-services+xml |
| .rsd | application/rsd+xml |
| .rss | application/rss+xml |
| .rtf | application/rtf |
| .sbml | application/sbml+xml |
| .scq | application/scvp-cv-request |
| .scs | application/scvp-cv-response |
| .spq | application/scvp-vp-request |
| .spp | application/scvp-vp-response |
| .sdp | application/sdp |
| .setpay | application/set-payment-initiation |
| .setreg | application/set-registration-initiation |
| .shf | application/shf+xml |
| .smi .smil | application/smil+xml |
| .rq | application/sparql-query |
| .srx | application/sparql-results+xml |
| .gram | application/srgs |
| .grxml | application/srgs+xml |
| .ssml | application/ssml+xml |
| .plb | application/vnd.3gpp.pic-bw-large |
| .psb | application/vnd.3gpp.pic-bw-small |
| .pvb | application/vnd.3gpp.pic-bw-var |
| .tcap | application/vnd.3gpp2.tcap |
| .pwn | application/vnd.3m.post-it-notes |
| .aso | application/vnd.accpac.simply.aso |
| .imp | application/vnd.accpac.simply.imp |
| .acu | application/vnd.acucobol |
| .atc .acutc | application/vnd.acucorp |
| .xdp | application/vnd.adobe.xdp+xml |
| .xfdf | application/vnd.adobe.xfdf |
| .ami | application/vnd.amiga.ami |
| .cii | application/vnd.anser-web-certificate-issue-initiation |
| .fti | application/vnd.anser-web-funds-transfer-initiation |
| .atx | application/vnd.antix.game-component |
| .mpkg | application/vnd.apple.installer+xml |
| .aep | application/vnd.audiograph |
| .mpm | application/vnd.blueice.multipass |
| .bmi | application/vnd.bmi |
| .rep | application/vnd.businessobjects |
| .cdxml | application/vnd.chemdraw+xml |
| .mmd | application/vnd.chipnuts.karaoke-mmd |
| .cdy | application/vnd.cinderella |
| .cla | application/vnd.claymore |
| .c4g .c4d .c4f .c4p .c4u | application/vnd.clonk.c4group |
| .csp .cst | application/vnd.commonspace |
| .cdbcmsg | application/vnd.contact.cmsg |
| .cmc | application/vnd.cosmocaller |
| .clkx | application/vnd.crick.clicker |
| .clkk | application/vnd.crick.clicker.keyboard |
| .clkp | application/vnd.crick.clicker.palette |
| .clkt | application/vnd.crick.clicker.template |
| .clkw | application/vnd.crick.clicker.wordbank |
| .wbs | application/vnd.criticaltools.wbs+xml |
| .pml | application/vnd.ctc-posml |
| .ppd | application/vnd.cups-ppd |
| .curl | application/vnd.curl |
| .rdz | application/vnd.data-vision.rdz |
| .fe_launch | application/vnd.denovo.fcselayout-link |
| .dna | application/vnd.dna |
| .mlp | application/vnd.dolby.mlp |
| .dpg | application/vnd.dpgraph |
| .dfac | application/vnd.dreamfactory |
| .mag | application/vnd.ecowin.chart |
| .nml | application/vnd.enliven |
| .esf | application/vnd.epson.esf |
| .msf | application/vnd.epson.msf |
| .qam | application/vnd.epson.quickanime |
| .slt | application/vnd.epson.salt |
| .ssf | application/vnd.epson.ssf |
| .es3 .et3 | application/vnd.eszigno3+xml |
| .ez2 | application/vnd.ezpix-album |
| .ez3 | application/vnd.ezpix-package |
| .fdf | application/vnd.fdf |
| .gph | application/vnd.flographit |
| .ftc | application/vnd.fluxtime.clip |
| .fm .frame .maker | application/vnd.framemaker |
| .fnc | application/vnd.frogans.fnc |
| .ltf | application/vnd.frogans.ltf |
| .fsc | application/vnd.fsc.weblaunch |
| .oas | application/vnd.fujitsu.oasys |
| .oa2 | application/vnd.fujitsu.oasys2 |
| .oa3 | application/vnd.fujitsu.oasys3 |
| .fg5 | application/vnd.fujitsu.oasysgp |
| .bh2 | application/vnd.fujitsu.oasysprs |
| .ddd | application/vnd.fujixerox.ddd |
| .xdw | application/vnd.fujixerox.docuworks |
| .xbd | application/vnd.fujixerox.docuworks.binder |
| .fzs | application/vnd.fuzzysheet |
| .txd | application/vnd.genomatix.tuxedo |
| .kml | application/vnd.google-earth.kml+xml |
| .kmz | application/vnd.google-earth.kmz |
| .gqf .gqs | application/vnd.grafeq |
| .gac | application/vnd.groove-account |
| .ghf | application/vnd.groove-help |
| .gim | application/vnd.groove-identity-message |
| .grv | application/vnd.groove-injector |
| .gtm | application/vnd.groove-tool-message |
| .tpl | application/vnd.groove-tool-template |
| .vcg | application/vnd.groove-vcard |
| .zmm | application/vnd.handheld-entertainment+xml |
| .hbci | application/vnd.hbci |
| .les | application/vnd.hhe.lesson-player |
| .hpgl | application/vnd.hp-hpgl |
| .hpid | application/vnd.hp-hpid |
| .hps | application/vnd.hp-hps |
| .jlt | application/vnd.hp-jlyt |
| .pcl | application/vnd.hp-pcl |
| .pclxl | application/vnd.hp-pclxl |
| .x3d | application/vnd.hzn-3d-crossword |
| .mpy | application/vnd.ibm.minipay |
| .afp .listafp .list3820 | application/vnd.ibm.modcap |
| .irm | application/vnd.ibm.rights-management |
| .sc | application/vnd.ibm.secure-container |
| .igl | application/vnd.igloader |
| .ivp | application/vnd.immervision-ivp |
| .ivu | application/vnd.immervision-ivu |
| .xpw .xpx | application/vnd.intercon.formnet |
| .qbo | application/vnd.intu.qbo |
| .qfx | application/vnd.intu.qfx |
| .rcprofile | application/vnd.ipunplugged.rcprofile |
| .irp | application/vnd.irepository.package+xml |
| .xpr | application/vnd.is-xpr |
| .jam | application/vnd.jam |
| .rms | application/vnd.jcp.javame.midlet-rms |
| .jisp | application/vnd.jisp |
| .joda | application/vnd.joost.joda-archive |
| .ktz .ktr | application/vnd.kahootz |
| .karbon | application/vnd.kde.karbon |
| .chrt | application/vnd.kde.kchart |
| .kfo | application/vnd.kde.kformula |
| .flw | application/vnd.kde.kivio |
| .kon | application/vnd.kde.kontour |
| .kpr .kpt | application/vnd.kde.kpresenter |
| .ksp | application/vnd.kde.kspread |
| .kwd .kwt | application/vnd.kde.kword |
| .htke | application/vnd.kenameaapp |
| .kia | application/vnd.kidspiration |
| .kne .knp | application/vnd.kinar |
| .skp .skd .skt .skm | application/vnd.koan |
| .lbd | application/vnd.llamagraphics.life-balance.desktop |
| .lbe | application/vnd.llamagraphics.life-balance.exchange+xml |
| .123 | application/vnd.lotus-1-2-3 |
| .apr | application/vnd.lotus-approach |
| .pre | application/vnd.lotus-freelance |
| .nsf | application/vnd.lotus-notes |
| .org | application/vnd.lotus-organizer |
| .scm | application/vnd.lotus-screencam |
| .lwp | application/vnd.lotus-wordpro |
| .portpkg | application/vnd.macports.portpkg |
| .mcd | application/vnd.mcd |
| .mc1 | application/vnd.medcalcdata |
| .cdkey | application/vnd.mediastation.cdkey |
| .mwf | application/vnd.mfer |
| .mfm | application/vnd.mfmp |
| .flo | application/vnd.micrografx.flo |
| .igx | application/vnd.micrografx.igx |
| .mif | application/vnd.mif |
| .daf | application/vnd.mobius.daf |
| .dis | application/vnd.mobius.dis |
| .mbk | application/vnd.mobius.mbk |
| .mqy | application/vnd.mobius.mqy |
| .msl | application/vnd.mobius.msl |
| .plc | application/vnd.mobius.plc |
| .txf | application/vnd.mobius.txf |
| .mpn | application/vnd.mophun.application |
| .mpc | application/vnd.mophun.certificate |
| .cil | application/vnd.ms-artgalry |
| .asf | application/vnd.ms-asf |
| .cab | application/vnd.ms-cab-compressed |
| .xls .xlm .xla .xlc .xlt .xlw | application/vnd.ms-excel |
| .eot | application/vnd.ms-fontobject |
| .chm | application/vnd.ms-htmlhelp |
| .ims | application/vnd.ms-ims |
| .lrm | application/vnd.ms-lrm |
| .ppt .pps .pot | application/vnd.ms-powerpoint |
| .mpp .mpt | application/vnd.ms-project |
| .wps .wks .wcm .wdb | application/vnd.ms-works |
| .wpl | application/vnd.ms-wpl |
| .xps | application/vnd.ms-xpsdocument |
| .mseq | application/vnd.mseq |
| .mus | application/vnd.musician |
| .msty | application/vnd.muvee.style |
| .nlu | application/vnd.neurolanguage.nlu |
| .nnd | application/vnd.noblenet-directory |
| .nns | application/vnd.noblenet-sealer |
| .nnw | application/vnd.noblenet-web |
| .ngdat | application/vnd.nokia.n-gage.data |
| .n-gage | application/vnd.nokia.n-gage.symbian.install |
| .rpst | application/vnd.nokia.radio-preset |
| .rpss | application/vnd.nokia.radio-presets |
| .edm | application/vnd.novadigm.edm |
| .edx | application/vnd.novadigm.edx |
| .ext | application/vnd.novadigm.ext |
| .odc | application/vnd.oasis.opendocument.chart |
| .otc | application/vnd.oasis.opendocument.chart-template |
| .odf | application/vnd.oasis.opendocument.formula |
| .otf | application/vnd.oasis.opendocument.formula-template |
| .odg | application/vnd.oasis.opendocument.graphics |
| .otg | application/vnd.oasis.opendocument.graphics-template |
| .odi | application/vnd.oasis.opendocument.image |
| .oti | application/vnd.oasis.opendocument.image-template |
| .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 |
| .otm | application/vnd.oasis.opendocument.text-master |
| .ott | application/vnd.oasis.opendocument.text-template |
| .oth | application/vnd.oasis.opendocument.text-web |
| .xo | application/vnd.olpc-sugar |
| .dd2 | application/vnd.oma.dd2+xml |
| .oxt | application/vnd.openofficeorg.extension |
| .dp | application/vnd.osgi.dp |
| .prc .pdb .pqa .oprc | application/vnd.palm |
| .str | application/vnd.pg.format |
| .ei6 | application/vnd.pg.osasli |
| .efif | application/vnd.picsel |
| .plf | application/vnd.pocketlearn |
| .pbd | application/vnd.powerbuilder6 |
| .box | application/vnd.previewsystems.box |
| .mgz | application/vnd.proteus.magazine |
| .qps | application/vnd.publishare-delta-tree |
| .ptid | application/vnd.pvi.ptid1 |
| .qxd .qxt .qwd .qwt .qxl .qxb | application/vnd.quark.quarkxpress |
| .mxl | application/vnd.recordare.musicxml |
| .rm | application/vnd.rn-realmedia |
| .see | application/vnd.seemail |
| .sema | application/vnd.sema |
| .semd | application/vnd.semd |
| .semf | application/vnd.semf |
| .ifm | application/vnd.shana.informed.formdata |
| .itp | application/vnd.shana.informed.formtemplate |
| .iif | application/vnd.shana.informed.interchange |
| .ipk | application/vnd.shana.informed.package |
| .twd .twds | application/vnd.simtech-mindmapper |
| .mmf | application/vnd.smaf |
| .sdkm .sdkd | application/vnd.solent.sdkm+xml |
| .dxp | application/vnd.spotfire.dxp |
| .sfs | application/vnd.spotfire.sfs |
| .sus .susp | application/vnd.sus-calendar |
| .svd | application/vnd.svd |
| .xsm | application/vnd.syncml+xml |
| .bdm | application/vnd.syncml.dm+wbxml |
| .xdm | application/vnd.syncml.dm+xml |
| .tao | application/vnd.tao.intent-module-archive |
| .tmo | application/vnd.tmobile-livetv |
| .tpt | application/vnd.trid.tpt |
| .mxs | application/vnd.triscape.mxs |
| .tra | application/vnd.trueapp |
| .ufd .ufdl | application/vnd.ufdl |
| .utz | application/vnd.uiq.theme |
| .umj | application/vnd.umajin |
| .unityweb | application/vnd.unity |
| .uoml | application/vnd.uoml+xml |
| .vcx | application/vnd.vcx |
| .vsd .vst .vss .vsw | application/vnd.visio |
| .vis | application/vnd.visionary |
| .vsf | application/vnd.vsf |
| .wbxml | application/vnd.wap.wbxml |
| .wmlc | application/vnd.wap.wmlc |
| .wmlsc | application/vnd.wap.wmlscriptc |
| .wtb | application/vnd.webturbo |
| .wpd | application/vnd.wordperfect |
| .wqd | application/vnd.wqd |
| .stf | application/vnd.wt.stf |
| .xar | application/vnd.xara |
| .xfdl | application/vnd.xfdl |
| .hvd | application/vnd.yamaha.hv-dic |
| .hvs | application/vnd.yamaha.hv-script |
| .hvp | application/vnd.yamaha.hv-voice |
| .saf | application/vnd.yamaha.smaf-audio |
| .spf | application/vnd.yamaha.smaf-phrase |
| .cmp | application/vnd.yellowriver-custom-menu |
| .zaz | application/vnd.zzazz.deck+xml |
| .vxml | application/voicexml+xml |
| .hlp | application/winhlp |
| .wsdl | application/wsdl+xml |
| .wspolicy | application/wspolicy+xml |
| .ace | application/x-ace-compressed |
| .bcpio | application/x-bcpio |
| .torrent | application/x-bittorrent |
| .bz | application/x-bzip |
| .bz2 .boz | application/x-bzip2 |
| .vcd | application/x-cdlink |
| .chat | application/x-chat |
| .pgn | application/x-chess-pgn |
| .Z | application/x-compress |
| .cpio | application/x-cpio |
| .csh | application/x-csh |
| .dcr .dir .dxr .fgd | application/x-director |
| .dvi | application/x-dvi |
| .spl | application/x-futuresplash |
| .gtar | application/x-gtar |
| .gz .tgz | application/x-gzip |
| .hdf | application/x-hdf |
| .latex | application/x-latex |
| .wmd | application/x-ms-wmd |
| .wmz | application/x-ms-wmz |
| .mdb | application/x-msaccess |
| .obd | application/x-msbinder |
| .crd | application/x-mscardfile |
| .clp | application/x-msclip |
| .exe .dll .com .bat .msi | application/x-msdownload |
| .mvb .m13 .m14 | application/x-msmediaview |
| .wmf | application/x-msmetafile |
| .mny | application/x-msmoney |
| .pub | application/x-mspublisher |
| .scd | application/x-msschedule |
| .trm | application/x-msterminal |
| .wri | application/x-mswrite |
| .nc .cdf | application/x-netcdf |
| .p12 .pfx | application/x-pkcs12 |
| .p7b .spc | application/x-pkcs7-certificates |
| .p7r | application/x-pkcs7-certreqresp |
| .rar | application/x-rar-compressed |
| .sh | application/x-sh |
| .shar | application/x-shar |
| .swf | application/x-shockwave-flash |
| .sit | application/x-stuffit |
| .sitx | application/x-stuffitx |
| .sv4cpio | application/x-sv4cpio |
| .sv4crc | application/x-sv4crc |
| .tar | application/x-tar |
| .tcl | application/x-tcl |
| .tex | application/x-tex |
| .texinfo .texi | application/x-texinfo |
| .ustar | application/x-ustar |
| .src | application/x-wais-source |
| .der .crt | application/x-x509-ca-cert |
| .xenc | application/xenc+xml |
| .xhtml .xht | application/xhtml+xml |
| .xml .xsl | application/xml |
| .dtd | application/xml-dtd |
| .xop | application/xop+xml |
| .xslt | application/xslt+xml |
| .xspf | application/xspf+xml |
| .mxml .xhvml .xvml .xvm | application/xv+xml |
| .zip | application/zip |
| .au .snd | audio/basic |
| .mid .midi .kar .rmi | audio/midi |
| .mp4a | audio/mp4 |
| .mpga .mp2 .mp2a .mp3 .m2a .m3a | audio/mpeg |
| .eol | audio/vnd.digital-winds |
| .lvp | audio/vnd.lucent.voice |
| .ecelp4800 | audio/vnd.nuera.ecelp4800 |
| .ecelp7470 | audio/vnd.nuera.ecelp7470 |
| .ecelp9600 | audio/vnd.nuera.ecelp9600 |
| .wav | audio/wav |
| .aif .aiff .aifc | audio/x-aiff |
| .m3u | audio/x-mpegurl |
| .wax | audio/x-ms-wax |
| .wma | audio/x-ms-wma |
| .ram .ra | audio/x-pn-realaudio |
| .rmp | audio/x-pn-realaudio-plugin |
| .wav | audio/x-wav |
| .cdx | chemical/x-cdx |
| .cif | chemical/x-cif |
| .cmdf | chemical/x-cmdf |
| .cml | chemical/x-cml |
| .csml | chemical/x-csml |
| .pdb | chemical/x-pdb |
| .xyz | chemical/x-xyz |
| .bmp | image/bmp |
| .cgm | image/cgm |
| .g3 | image/g3fax |
| .gif | image/gif |
| .ief | image/ief |
| .jpeg .jpg .jpe | image/jpeg |
| .png | image/png |
| .btif | image/prs.btif |
| .svg .svgz | image/svg+xml |
| .tiff .tif | image/tiff |
| .psd | image/vnd.adobe.photoshop |
| .djvu djv | image/vnd.djvu |
| .dwg | image/vnd.dwg |
| .dxf | image/vnd.dxf |
| .fbs | image/vnd.fastbidsheet |
| .fpx | image/vnd.fpx |
| .fst | image/vnd.fst |
| .mmr | image/vnd.fujixerox.edmics-mmr |
| .rlc | image/vnd.fujixerox.edmics-rlc |
| .mdi | image/vnd.ms-modi |
| .npx | image/vnd.net-fpx |
| .wbmp | image/vnd.wap.wbmp |
| .xif | image/vnd.xiff |
| .ras | image/x-cmu-raster |
| .cmx | image/x-cmx |
| .ico | image/x-icon |
| .pcx | image/x-pcx |
| .pic .pct | image/x-pict |
| .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 |
| .eml .mime | message/rfc822 |
| .igs .iges | model/iges |
| .msh .mesh .silo | model/mesh |
| .dwf | model/vnd.dwf |
| .gdl | model/vnd.gdl |
| .gtw | model/vnd.gtw |
| .mts | model/vnd.mts |
| .vtu | model/vnd.vtu |
| .wrl .vrml | model/vrml |
| .ics .ifb | text/calendar |
| .css | text/css |
| .csv | text/csv |
| .html .htm | text/html |
| .txt .text .conf .def .list .log .in | text/plain |
| .dsc | text/prs.lines.tag |
| .rtx | text/richtext |
| .sgml .sgm | text/sgml |
| .tsv | text/tab-separated-values |
| .t .tr .roff .man .me .ms | text/troff |
| .uri .uris .urls | text/uri-list |
| .fly | text/vnd.fly |
| .flx | text/vnd.fmi.flexstor |
| .3dml | text/vnd.in3d.3dml |
| .spot | text/vnd.in3d.spot |
| .jad | text/vnd.sun.j2me.app-descriptor |
| .wml | text/vnd.wap.wml |
| .wmls | text/vnd.wap.wmlscript |
| .s .asm | text/x-asm |
| .c .cc .cxx .cpp .h .hh .dic | text/x-c |
| .f .for .f77 .f90 | text/x-fortran |
| .p .pas | text/x-pascal |
| .java | text/x-java-source |
| .etx | text/x-setext |
| .uu | text/x-uuencode |
| .vcs | text/x-vcalendar |
| .vcf | text/x-vcard |
| .3gp | video/3gpp |
| .3g2 | video/3gpp2 |
| .h261 | video/h261 |
| .h263 | video/h263 |
| .h264 | video/h264 |
| .jpg | video/jpeg |
| .jpm .jpgm | video/jpm |
| .mj2 .mjp2 | video/mj2 |
| .mp4 .mp4v .mpg4 | video/mp4 |
| .mpeg .mpg .mpe .m1v .m2v | video/mpeg |
| .qt .mov | video/quicktime |
| .fvt | video/vnd.fvt |
| .mxu .m4u | video/vnd.mpegurl |
| .viv | video/vnd.vivo |
| .fli | video/x-fli |
| .asf .asx | video/x-ms-asf |
| .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 |