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-8Content-Type: multipart/form-data; boundary=something实例：

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.tifimage/tiff.001application/x-001.301application/x-301.323text/h323.906application/x-906.907drawing/907.a11application/x-a11.acpaudio/x-mei-aac.aiapplication/postscript.aifaudio/aiff.aifcaudio/aiff.aiffaudio/aiff.anvapplication/x-anv.asatext/asa.asfvideo/x-ms-asf.asptext/asp.asxvideo/x-ms-asf.auaudio/basic.avivideo/avi.awfapplication/vnd.adobe.workflow.biztext/xml.bmpapplication/x-bmp.botapplication/x-bot.c4tapplication/x-c4t.c90application/x-c90.calapplication/x-cals.catapplication/vnd.ms-pki.seccat.cdfapplication/x-netcdf.cdrapplication/x-cdr.celapplication/x-cel.cerapplication/x-x509-ca-cert.cg4application/x-g4.cgmapplication/x-cgm.citapplication/x-cit.classjava/*.cmltext/xml.cmpapplication/x-cmp.cmxapplication/x-cmx.cotapplication/x-cot.crlapplication/pkix-crl.crtapplication/x-x509-ca-cert.csiapplication/x-csi.csstext/css.cutapplication/x-cut.dbfapplication/x-dbf.dbmapplication/x-dbm.dbxapplication/x-dbx.dcdtext/xml.dcxapplication/x-dcx.derapplication/x-x509-ca-cert.dgnapplication/x-dgn.dibapplication/x-dib.dllapplication/x-msdownload.docapplication/msword.dotapplication/msword.drwapplication/x-drw.dtdtext/xml.dwfModel/vnd.dwf.dwfapplication/x-dwf.dwgapplication/x-dwg.dxbapplication/x-dxb.dxfapplication/x-dxf.ednapplication/vnd.adobe.edn.emfapplication/x-emf.emlmessage/rfc822.enttext/xml.epiapplication/x-epi.epsapplication/x-ps.epsapplication/postscript.etdapplication/x-ebx.exeapplication/x-msdownload.faximage/fax.fdfapplication/vnd.fdf.fifapplication/fractals.fotext/xml.frmapplication/x-frm.g4application/x-g4.gbrapplication/x-gbr.application/x-.gifimage/gif.gl2application/x-gl2.gp4application/x-gp4.hglapplication/x-hgl.hmrapplication/x-hmr.hpgapplication/x-hpgl.hplapplication/x-hpl.hqxapplication/mac-binhex40.hrfapplication/x-hrf.htaapplication/hta.htctext/x-component.htmtext/html.htmltext/html.htttext/webviewhtml.htxtext/html.icbapplication/x-icb.icoimage/x-icon.icoapplication/x-ico.iffapplication/x-iff.ig4application/x-g4.igsapplication/x-igs.iiiapplication/x-iphone.imgapplication/x-img.insapplication/x-internet-signup.ispapplication/x-internet-signup.IVFvideo/x-ivf.javajava/*.jfifimage/jpeg.jpeimage/jpeg.jpeapplication/x-jpe.jpegimage/jpeg.jpgimage/jpeg.jpgapplication/x-jpg.jsapplication/x-javascript.jsptext/html.la1audio/x-liquid-file.larapplication/x-laplayer-reg.latexapplication/x-latex.lavsaudio/x-liquid-secure.lbmapplication/x-lbm.lmsffaudio/x-la-lms.lsapplication/x-javascript.ltrapplication/x-ltr.m1vvideo/x-mpeg.m2vvideo/x-mpeg.m3uaudio/mpegurl.m4evideo/mpeg4.macapplication/x-mac.manapplication/x-troff-man.mathtext/xml.mdbapplication/msaccess.mdbapplication/x-mdb.mfpapplication/x-shockwave-flash.mhtmessage/rfc822.mhtmlmessage/rfc822.miapplication/x-mi.midaudio/mid.midiaudio/mid.milapplication/x-mil.mmltext/xml.mndaudio/x-musicnet-download.mnsaudio/x-musicnet-stream.mochaapplication/x-javascript.movievideo/x-sgi-movie.mp1audio/mp1.mp2audio/mp2.mp2vvideo/mpeg.mp3audio/mp3.mp4video/mpeg4.mpavideo/x-mpg.mpdapplication/vnd.ms-project.mpevideo/x-mpeg.mpegvideo/mpg.mpgvideo/mpg.mpgaaudio/rn-mpeg.mppapplication/vnd.ms-project.mpsvideo/x-mpeg.mptapplication/vnd.ms-project.mpvvideo/mpg.mpv2video/mpeg.mpwapplication/vnd.ms-project.mpxapplication/vnd.ms-project.mtxtext/xml.mxpapplication/x-mmxp.netimage/pnetvue.nrfapplication/x-nrf.nwsmessage/rfc822.odctext/x-ms-odc.outapplication/x-out.p10application/pkcs10.p12application/x-pkcs12.p7bapplication/x-pkcs7-certificates.p7capplication/pkcs7-mime.p7mapplication/pkcs7-mime.p7rapplication/x-pkcs7-certreqresp.p7sapplication/pkcs7-signature.pc5application/x-pc5.pciapplication/x-pci.pclapplication/x-pcl.pcxapplication/x-pcx.pdfapplication/pdf.pdfapplication/pdf.pdxapplication/vnd.adobe.pdx.pfxapplication/x-pkcs12.pglapplication/x-pgl.picapplication/x-pic.pkoapplication/vnd.ms-pki.pko.plapplication/x-perl.plgtext/html.plsaudio/scpls.pltapplication/x-plt.pngimage/png.pngapplication/x-png.potapplication/vnd.ms-powerpoint.ppaapplication/vnd.ms-powerpoint.ppmapplication/x-ppm.ppsapplication/vnd.ms-powerpoint.pptapplication/vnd.ms-powerpoint.pptapplication/x-ppt.prapplication/x-pr.prfapplication/pics-rules.prnapplication/x-prn.prtapplication/x-prt.psapplication/x-ps.psapplication/postscript.ptnapplication/x-ptn.pwzapplication/vnd.ms-powerpoint.r3ttext/vnd.rn-realtext3d.raaudio/vnd.rn-realaudio.ramaudio/x-pn-realaudio.rasapplication/x-ras.ratapplication/rat-file.rdftext/xml.recapplication/vnd.rn-recording.redapplication/x-red.rgbapplication/x-rgb.rjsapplication/vnd.rn-realsystem-rjs.rjtapplication/vnd.rn-realsystem-rjt.rlcapplication/x-rlc.rleapplication/x-rle.rmapplication/vnd.rn-realmedia.rmfapplication/vnd.adobe.rmf.rmiaudio/mid.rmjapplication/vnd.rn-realsystem-rmj.rmmaudio/x-pn-realaudio.rmpapplication/vnd.rn-rn_music_package.rmsapplication/vnd.rn-realmedia-secure.rmvbapplication/vnd.rn-realmedia-vbr.rmxapplication/vnd.rn-realsystem-rmx.rnxapplication/vnd.rn-realplayer.rpimage/vnd.rn-realpix.rpmaudio/x-pn-realaudio-plugin.rsml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