Content-Type specifies a standard Multipurpose Internet Mail Extensions (MIME) type that describes the format of received or sent data. A browser determines how to open the data based on the value of the header. In general, this header is used to specify how to open files customized by clients or media files.

By default, Object Storage Service (OSS) automatically identifies the type of an object. For example, if the type of an uploaded object is JPG, OSS automatically identifies the object as an image object. You can modify the type of an object by using the OSS console, ossbrowser, ossutil, or OSS SDKs for various programming languages such as Java SDK, Python SDK, PHP SDK, and Go SDK. For more information, see Configure object metadata, Use ossbrowser, and set-meta.

The following table describes the common values of Content-Type.

File extension Content-Type(Mime-Type) File extension Content-Type(Mime-Type)
(binary stream or unknown file type) application/octet-stream .tif image/tiff
0.001 application/x-001 0.301 application/x-301
0.323 text/h323 0.906 application/x-906
0.907 drawing/907 .a11 application/x-a11
.acp audio/x-mei-aac .ai application/postscript
.aif audio/aiff .aifc audio/aiff
.aiff audio/aiff .anv application/x-anv
.apk application/ .asa text/asa
.asf video/x-ms-asf .asp text/asp
.asx video/x-ms-asf .au audio/basic
.avi video/avi .awf application/vnd.adobe.workflow
.biz text/xml .bmp application/x-bmp
.bot application/x-bot .c4t application/x-c4t
.c90 application/x-c90 .cal application/x-cals
.cat application/ .cdf application/x-netcdf
.cdr application/x-cdr .cel application/x-cel
.cer application/x-x509-ca-cert .cg4 application/x-g4
.cgm application/x-cgm .cit application/x-cit
.class java/ .cml text/xml
.cmp application/x-cmp .cmx application/x-cmx
.cot application/x-cot .crl application/pkix-crl
.crt application/x-x509-ca-cert .csi application/x-csi
.css text/css .cut application/x-cut
.dbf application/x-dbf .dbm application/x-dbm
.dbx application/x-dbx .dcd text/xml
.dcx application/x-dcx .der application/x-x509-ca-cert
.dgn application/x-dgn .dib application/x-dib
.dll application/x-msdownload .doc application/msword
.docx application/vnd.openxmlformats-officedocument.wordprocessingml.document .dot application/msword
.dotx application/vnd.openxmlformats-officedocument.wordprocessingml.template .drw application/x-drw
.dtd text/xml .dwf Model/vnd.dwf
.dwf application/x-dwf .dwg application/x-dwg
.dxb application/x-dxb .dxf application/x-dxf
.edn application/vnd.adobe.edn .emf application/x-emf
.eml message/rfc822 .ent text/xml
.epi application/x-epi .eps application/x-ps
.eps application/postscript .etd application/x-ebx
.exe application/x-msdownload .fax image/fax
.fdf application/vnd.fdf .fif application/fractals
.fo text/xml .frm application/x-frm
.g4 application/x-g4 .gbr application/x-gbr
. application/x- .gif image/gif
.gl2 application/x-gl2 .gp4 application/x-gp4
.hgl application/x-hgl .hmr application/x-hmr
.hpg application/x-hpgl .hpl application/x-hpl
.hqx application/mac-binhex40 .hrf application/x-hrf
.hta application/hta .htc text/x-component
.htm text/html .html text/html
.htt text/webviewhtml .htx text/html
.icb application/x-icb .ico image/x-icon
.ico application/x-ico .iff application/x-iff
.ig4 application/x-g4 .igs application/x-igs
.iii application/x-iphone .img application/x-img
.ins application/x-internet-signup .ipa application/vnd.iphone
.isp application/x-internet-signup .IVF video/x-ivf
.java java/* .jfif image/jpeg
.jpe image/jpeg .jpe application/x-jpe
.jpeg image/jpeg .jpg image/jpeg
.jpg application/x-jpg .js application/x-javascript
.jsp text/html .la1 audio/x-liquid-file
.lar application/x-laplayer-reg .latex application/x-latex
.lavs audio/x-liquid-secure .lbm application/x-lbm
.lmsff audio/x-la-lms .ls application/x-javascript
.ltr application/x-ltr .m1v video/x-mpeg
.m2v video/x-mpeg .m3u audio/mpegurl
.m4e video/mpeg4 .mac application/x-mac
.man application/x-troff-man .math text/xml
.mdb application/msaccess .mdb application/x-mdb
.mfp application/x-shockwave-flash .mht message/rfc822
.mhtml message/rfc822 .mi application/x-mi
.mid audio/mid .midi audio/mid
.mil application/x-mil .mml text/xml
.mnd audio/x-musicnet-download .mns audio/x-musicnet-stream
.mocha application/x-javascript .movie video/x-sgi-movie
.mp1 audio/mp1 .mp2 audio/mp2
.mp2v video/mpeg .mp3 audio/mp3
.mp4 video/mp4 .mpa video/x-mpg
.mpd application/ .mpe video/x-mpeg
.mpeg video/mpg .mpg video/mpg
.mpga audio/rn-mpeg .mpp application/
.mps video/x-mpeg .mpt application/
.mpv video/mpg .mpv2 video/mpeg
.mpw application/ .mpx application/
.mtx text/xml .mxp application/x-mmxp
.net image/pnetvue .nrf application/x-nrf
.nws message/rfc822 .odc text/x-ms-odc
.out application/x-out .p10 application/pkcs10
.p12 application/x-pkcs12 .p7b application/x-pkcs7-certificates
.p7c application/pkcs7-mime .p7m application/pkcs7-mime
.p7r application/x-pkcs7-certreqresp .p7s application/pkcs7-signature
.pc5 application/x-pc5 .pci application/x-pci
.pcl application/x-pcl .pcx application/x-pcx
.pdf application/pdf .pdb chemical/x-pdb
.pdx application/vnd.adobe.pdx .pfx application/x-pkcs12
.pgl application/x-pgl .pic application/x-pic
.pko application/ .pl application/x-perl
.plg text/html .pls audio/scpls
.plt application/x-plt .png image/png
.png application/x-png .pot application/
.potx application/vnd.openxmlformats-officedocument.presentationml.template .ppa application/
.ppm application/x-ppm .pps application/
.ppsx application/vnd.openxmlformats-officedocument.presentationml.slideshow .ppt application/
.ppt application/x-ppt . pptx application/vnd.openxmlformats-officedocument.presentationml.presentation
.pr application/x-pr .prf application/pics-rules
.prn application/x-prn .prt application/x-prt
.ps application/x-ps .ps application/postscript
.ptn application/x-ptn .pwz application/
.r3t text/vnd.rn-realtext3d .ra audio/vnd.rn-realaudio
.ram audio/x-pn-realaudio .ras application/x-ras
.rat application/rat-file .rdf text/xml
.rec application/vnd.rn-recording .red application/x-red
.rgb application/x-rgb .rjs application/vnd.rn-realsystem-rjs
.rjt application/vnd.rn-realsystem-rjt .rlc application/x-rlc
.rle application/x-rle .rm application/vnd.rn-realmedia
.rmf application/vnd.adobe.rmf .rmi audio/mid
.rmj application/vnd.rn-realsystem-rmj .rmm audio/x-pn-realaudio
.rmp application/vnd.rn-rn_music_package .rms application/vnd.rn-realmedia-secure
.rmvb application/vnd.rn-realmedia-vbr .rmx application/vnd.rn-realsystem-rmx
.rnx application/vnd.rn-realplayer .rp image/vnd.rn-realpix
.rpm audio/x-pn-realaudio-plugin .rsml application/vnd.rn-rsml
.rt text/vnd.rn-realtext .rtf application/msword
.rtf application/x-rtf .rv video/vnd.rn-realvideo
.sam application/x-sam .sat application/x-sat
.sdp application/sdp .sdw application/x-sdw
.sis application/vnd.symbian.install .sisx application/vnd.symbian.install
.sit application/x-stuffit .slb application/x-slb
.sld application/x-sld .sldx application/vnd.openxmlformats-officedocument.presentationml.slide
.slk drawing/x-slk .smi application/smil
.smil application/smil .smk application/x-smk
.snd audio/basic .sol text/plain
.sor text/plain .spc application/x-pkcs7-certificates
.spl application/futuresplash .spp text/xml
.ssm application/streamingmedia .sst application/
.stl application/ .stm text/html
.sty application/x-sty .svg image/svg+xml
.swf application/x-shockwave-flash .tdf application/x-tdf
.tg4 application/x-tg4 .tga application/x-tga
.tif image/tiff .tif application/x-tif
.tiff image/tiff .tld text/xml
.top drawing/x-top .torrent application/x-bittorrent
.tsd text/xml .txt text/plain
.uin application/x-icq .uls text/iuls
.vcf text/x-vcard .vda application/x-vda
.vdx application/vnd.visio .vml text/xml
.vpg application/x-vpeg005 .vsd application/vnd.visio
.vsd application/x-vsd .vss application/vnd.visio
.vst application/vnd.visio .vst application/x-vst
.vsw application/vnd.visio .vsx application/vnd.visio
.vtx application/vnd.visio .vxml text/xml
.wav audio/wav .wax audio/x-ms-wax
.wb1 application/x-wb1 .wb2 application/x-wb2
.wb3 application/x-wb3 .wbmp image/vnd.wap.wbmp
.wiz application/msword .wk3 application/x-wk3
.wk4 application/x-wk4 .wkq application/x-wkq
.wks application/x-wks .wm video/x-ms-wm
.wma audio/x-ms-wma .wmd application/x-ms-wmd
.wmf application/x-wmf .wml text/vnd.wap.wml
.wmv video/x-ms-wmv .wmx video/x-ms-wmx
.wmz application/x-ms-wmz .wp6 application/x-wp6
.wpd application/x-wpd .wpg application/x-wpg
.wpl application/ .wq1 application/x-wq1
.wr1 application/x-wr1 .wri application/x-wri
.wrk application/x-wrk .ws application/x-ws
.ws2 application/x-ws .wsc text/scriptlet
.wsdl text/xml .wvx video/x-ms-wvx
.xap application/x-silverlight-app .x_b application/x-x_b
.xdp application/vnd.adobe.xdp .xdr text/xml
.xfd application/vnd.adobe.xfd .xfdf application/vnd.adobe.xfdf
.xhtml text/html .xls application/
.xls application/x-xls .xlsx application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
.xltx application/vnd.openxmlformats-officedocument.spreadsheetml.template .xlw application/x-xlw
.xml text/xml .xpl audio/scpls
.xq text/xml .xql text/xml
.xquery text/xml .xsd text/xml
.xsl text/xml .xslt text/xml
.xwd application/x-xwd .x_t application/x-x_t
.yaml text/vnd.yaml .yml text/vnd.yml
.webp image/webp N/A N/A