HTTP content-type

Content-Type（内容类型），一般是指网页中存在的 Content-Type，用于定义网络文件的类型和网页的编码，决定浏览器将以什么形式、什么编码读取这个文件，这就是经常看到一些 PHP 网页点击的结果却是下载一个文件或一张图片的原因。

Content-Type 标头告诉客户端实际返回的内容的内容类型。

语法格式：

Content-Type: text/html; charset=utf-8
Content-Type: multipart/form-data; boundary=something

常见的媒体格式类型如下：

text/html ： HTML格式

text/plain ：纯文本格式

text/xml ： XML格式

image/gif ：gif图片格式

image/jpeg ：jpg图片格式

image/png：png图片格式

以application开头的媒体格式类型：

application/xhtml+xml ：XHTML格式

application/xml： XML数据格式

application/atom+xml ：Atom XML聚合格式

application/json： JSON数据格式

application/pdf：pdf格式

application/msword ： Word文档格式

application/octet-stream ：二进制流数据（如常见的文件下载）

application/x-www-form-urlencoded ： <form encType=””>中默认的encType，form表单数据被编码为key/value格式发送到服务器（表单默认的提交数据的格式）

另外一种常见的媒体格式是上传文件之时使用的：

multipart/form-data ：需要在表单中进行文件上传时，就需要使用该格式

HTTP content-type 对照表

文件扩展名 Content-Type(Mime-Type) 文件扩展名 Content-Type(Mime-Type) .*（二进制流，不知道下载文件类型） application/octet-stream image/tiff application/x-001 application/x-301 text/h323 application/x-906 drawing/907 application/x-a11 audio/x-mei-aac application/postscript audio/aiff .aifc audio/aiff .aiff audio/aiff application/x-anv text/asa video/x-ms-asf text/asp video/x-ms-asf audio/basic video/avi application/vnd.adobe.workflow text/xml application/x-bmp application/x-bot application/x-c4t application/x-c90 application/x-cals application/vnd.ms-pki.seccat application/x-netcdf application/x-cdr application/x-cel application/x-x509-ca-cert application/x-g4 application/x-cgm application/x-cit .class java/* text/xml application/x-cmp application/x-cmx application/x-cot application/pkix-crl application/x-x509-ca-cert application/x-csi text/css application/x-cut application/x-dbf application/x-dbm application/x-dbx text/xml application/x-dcx application/x-x509-ca-cert application/x-dgn application/x-dib application/x-msdownload application/msword application/msword application/x-drw text/xml Model/vnd.dwf application/x-dwf application/x-dwg application/x-dxb application/x-dxf application/vnd.adobe.edn application/x-emf message/rfc822 text/xml application/x-epi application/x-ps application/postscript application/x-ebx application/x-msdownload image/fax application/vnd.fdf application/fractals text/xml application/x-frm application/x-g4 application/x-gbr application/x- image/gif application/x-gl2 application/x-gp4 application/x-hgl application/x-hmr application/x-hpgl application/x-hpl application/mac-binhex40 application/x-hrf application/hta text/x-component text/html .html text/html text/webviewhtml text/html application/x-icb image/x-icon application/x-ico application/x-iff application/x-g4 application/x-igs application/x-iphone application/x-img application/x-internet-signup application/x-internet-signup video/x-ivf .java java/* .jfif image/jpeg image/jpeg application/x-jpe .jpeg image/jpeg image/jpeg application/x-jpg application/x-javascript text/html audio/x-liquid-file application/x-laplayer-reg .latex application/x-latex .lavs audio/x-liquid-secure application/x-lbm .lmsff audio/x-la-lms application/x-javascript application/x-ltr video/x-mpeg video/x-mpeg audio/mpegurl video/mpeg4 application/x-mac application/x-troff-man .math text/xml application/msaccess application/x-mdb application/x-shockwave-flash message/rfc822 .mhtml message/rfc822 application/x-mi audio/mid .midi audio/mid application/x-mil text/xml audio/x-musicnet-download audio/x-musicnet-stream .mocha application/x-javascript .movie video/x-sgi-movie audio/mp1 audio/mp2 .mp2v video/mpeg audio/mp3 video/mpeg4 video/x-mpg application/vnd.ms-project video/x-mpeg .mpeg video/mpg video/mpg .mpga audio/rn-mpeg application/vnd.ms-project video/x-mpeg application/vnd.ms-project video/mpg .mpv2 video/mpeg application/vnd.ms-project application/vnd.ms-project text/xml application/x-mmxp image/pnetvue application/x-nrf message/rfc822 text/x-ms-odc application/x-out application/pkcs10 application/x-pkcs12 application/x-pkcs7-certificates application/pkcs7-mime application/pkcs7-mime application/x-pkcs7-certreqresp application/pkcs7-signature application/x-pc5 application/x-pci application/x-pcl application/x-pcx application/pdf application/pdf application/vnd.adobe.pdx application/x-pkcs12 application/x-pgl application/x-pic application/vnd.ms-pki.pko application/x-perl text/html audio/scpls application/x-plt image/png application/x-png application/vnd.ms-powerpoint application/vnd.ms-powerpoint application/x-ppm application/vnd.ms-powerpoint application/vnd.ms-powerpoint application/x-ppt application/x-pr application/pics-rules application/x-prn application/x-prt application/x-ps application/postscript application/x-ptn application/vnd.ms-powerpoint text/vnd.rn-realtext3d audio/vnd.rn-realaudio audio/x-pn-realaudio application/x-ras application/rat-file text/xml application/vnd.rn-recording application/x-red application/x-rgb application/vnd.rn-realsystem-rjs application/vnd.rn-realsystem-rjt application/x-rlc application/x-rle application/vnd.rn-realmedia application/vnd.adobe.rmf audio/mid application/vnd.rn-realsystem-rmj audio/x-pn-realaudio application/vnd.rn-rn_music_package application/vnd.rn-realmedia-secure .rmvb application/vnd.rn-realmedia-vbr application/vnd.rn-realsystem-rmx application/vnd.rn-realplayer image/vnd.rn-realpix audio/x-pn-realaudio-plugin .rsml application/vnd.rn-rsml text/vnd.rn-realtext application/msword application/x-rtf video/vnd.rn-realvideo application/x-sam application/x-sat application/sdp application/x-sdw application/x-stuffit application/x-slb application/x-sld drawing/x-slk application/smil .smil application/smil application/x-smk audio/basic text/plain text/plain application/x-pkcs7-certificates application/futuresplash text/xml application/streamingmedia application/vnd.ms-pki.certstore application/vnd.ms-pki.stl text/html application/x-sty text/xml application/x-shockwave-flash application/x-tdf application/x-tg4 application/x-tga image/tiff application/x-tif .tiff image/tiff text/xml drawing/x-top .torrent application/x-bittorrent text/xml text/plain application/x-icq text/iuls text/x-vcard application/x-vda application/vnd.visio text/xml application/x-vpeg005 application/vnd.visio application/x-vsd application/vnd.visio application/vnd.visio application/x-vst application/vnd.visio application/vnd.visio application/vnd.visio .vxml text/xml audio/wav audio/x-ms-wax application/x-wb1 application/x-wb2 application/x-wb3 .wbmp image/vnd.wap.wbmp application/msword application/x-wk3 application/x-wk4 application/x-wkq application/x-wks video/x-ms-wm audio/x-ms-wma application/x-ms-wmd application/x-wmf text/vnd.wap.wml video/x-ms-wmv video/x-ms-wmx application/x-ms-wmz application/x-wp6 application/x-wpd application/x-wpg application/vnd.ms-wpl application/x-wq1 application/x-wr1 application/x-wri application/x-wrk application/x-ws application/x-ws text/scriptlet .wsdl text/xml video/x-ms-wvx application/vnd.adobe.xdp text/xml application/vnd.adobe.xfd .xfdf application/vnd.adobe.xfdf .xhtml text/html application/vnd.ms-excel application/x-xls application/x-xlw text/xml audio/scpls text/xml text/xml .xquery text/xml text/xml text/xml .xslt text/xml application/x-xwd application/x-x_b application/vnd.symbian.install .sisx application/vnd.symbian.install application/x-x_t application/vnd.iphone application/vnd.android.package-archive application/x-silverlight-app