The Content-Type header specifies a standard Multipurpose Internet Mail Extensions (MIME) type that describes the type of received or sent data. A browser determines how to open the data based on the value of the header. In most cases, this header is used to specify how to open user-defined files and media files.
If you do not specify the Content-Type header in a request to upload an object, Object Storage Service (OSS) SDKs identify the object type based on the extension of the object name and automatically set the Content-Type header to the type.
What is Content-Type?
The Content-Type header is used to specify the content type of the object. The browser determines the format and encoding type that are used to read the object based on the content type of the object. If this header is not specified, the value is generated based on the extension of the object name. If the object name does not contain an extension, the default value application/octet-stream is used as the content type of the object.
Specify the Content-Type header
You can specify the Content-Type header by using the OSS console, ossbrowser, OSS SDKs, ossutil, or OSS API. For more information, see Manage object metadata.
You can specify the Content-Type header only for a single object at a time. You cannot specify the Content-Type header for multiple objects at a time based on object name prefixes or extensions.
Common values of the Content-Type header
The following table describes the common values of the Content-Type header.
Object name extension | Content-Type (Mime-type) | Object name extension | Content-Type (Mime-type) |
(binary stream or unknown object type) | application/octet-stream | .tif | image/tiff |
.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/vnd.android.package-archive |
.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/vnd.ms-pki.seccat |
.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 |
.csv | text/csv | .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 | .mov | video/quicktime |
.movie | video/x-sgi-movie | mp1 | audio/mp1 |
.mp2 | audio/mp2 | .mp2v | video/mpeg |
.mp3 | audio/mpeg | .mp4 | video/mp4 |
.mpa | video/x-mpg | .mpd | application/vnd.ms-project |
.mpe | video/x-mpeg | .mpeg | video/mpg |
.mpg | video/mpg | .mpga | audio/rn-mpeg |
.mpp | application/vnd.ms-project | .mps | video/x-mpeg |
.mpt | application/vnd.ms-project | .mpv | video/mpg |
.mpv2 | video/mpeg | .mpw | application/vnd.ms-project |
.mpx | application/vnd.ms-project | .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 | 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/vnd.ms-pki.pko |
.pl | application/x-perl | .plg | text/html |
.pls | audio/scpls | .plt | application/x-plt |
.png | image/png | .png | application/x-png |
.pot | application/vnd.ms-powerpoint | .potx | application/vnd.openxmlformats-officedocument.presentationml.template |
.ppa | application/vnd.ms-powerpoint | .ppm | application/x-ppm |
.pps | application/vnd.ms-powerpoint | .ppsx | application/vnd.openxmlformats-officedocument.presentationml.slideshow |
.ppt | application/vnd.ms-powerpoint | .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/vnd.ms-powerpoint | .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/vnd.ms-pki.certstore | .stl | application/vnd.ms-pki.stl |
.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/vnd.ms-wpl |
.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/vnd.ms-excel | .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 |
.tar | application/x-tar | .zip | application/zip |