Content-Type（MIME）用于标识发送或接收数据的类型，浏览器根据该参数来决定数据的打开方式。Content-Type多用于指定一些客户端自定义的文件，以及一些媒体文件的打开方式。
如果您在上传Object时未指定Content-Type，SDK会根据指定Object名称的后缀名来判定文件类型并自动填充Content-Type。
什么是Content-Type
Content-Type用于指定Object的文件类型。文件类型决定浏览器将以什么形式、什么编码读取文件。如果没有指定文件类型，则根据文件的扩展名生成。如果文件没有扩展名，则使用文件类型的默认值application/octet-stream。
设置Content-Type
您可以使用OSS控制台、图形化管理工具ossbrowser、阿里云SDK、命令行工具ossutil以及REST API设置Content-Type。具体步骤，请参见管理文件元数据。
仅支持对单个Object设置Content-Type，不支持根据Object前缀或者后缀批量设置Content-Type。
常见的Content-Type
常见的Content-Type（MIME）列表如下：
文件扩展名 | Content-Type(Mime-Type) | 文件扩展名 | Content-Type(Mime-Type) |
（二进制流，未知的文件类型） | 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 |