如何理解Content-Type（MIME）(Node.js SDK)
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。内容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，则文件类型的默认值application/octet-stream。
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/mp3 |
.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 |
