常用HTTP Content-type头信息及文件类型对照
ai application/postscript aif audio/x-aiff aifc audio/x-aiff aiff audio/x-aiff asc text/plain au audio/basic avi video/x-msvideo bcpio application/x-bcpio bin application/octet-stream bmp image/bmp cdf application/x-netcdf class application/octet-stream cpio application/x-cpio cpt application/mac-compactpro csh application/x-csh css text/css dcr application/x-director dir application/x-director djv image/vnd.djvu djvu image/vnd.djvu dll application/octet-stream dms application/octet-stream doc application/msword dvi application/x-dvi dxr application/x-director eps application/postscript etx text/x-setext exe application/octet-stream ez application/andrew-inset gif image/gif gtar application/x-gtar hdf application/x-hdf hqx application/mac-binhex40 htm text/html html text/html ice x-conference/x-cooltalk ief image/ief iges model/iges igs model/iges jpe image/jpeg jpeg image/jpeg jpg image/jpeg js application/x-javascript kar audio/midi latex application/x-latex lha application/octet-stream lzh application/octet-stream m3u audio/x-mpegurl man application/x-troff-man me application/x-troff-me mesh model/mesh mid audio/midi midi audio/midi mif application/vnd.mif mov video/quicktime movie video/x-sgi-movie mp2 audio/mpeg mp3 audio/mpeg mpe video/mpeg mpeg video/mpeg mpg video/mpeg mpga audio/mpeg ms application/x-troff-ms msh model/mesh mxu video/vnd.mpegurl nc application/x-netcdf oda application/oda pbm image/x-portable-bitmap pdb chemical/x-pdb pdf application/pdf pgm image/x-portable-graymap pgn application/x-chess-pgn png image/png pnm image/x-portable-anymap ppm image/x-portable-pixmap ppt application/vnd.ms-powerpoint ps application/postscript qt video/quicktime ra audio/x-realaudio ram audio/x-pn-realaudio ras image/x-cmu-raster rgb image/x-rgb rm audio/x-pn-realaudio roff application/x-troff rpm audio/x-pn-realaudio-plugin rtf text/rtf rtx text/richtext sgm text/sgml sgml text/sgml sh application/x-sh shar application/x-shar silo model/mesh sit application/x-stuffit skd application/x-koan skm application/x-koan skp application/x-koan skt application/x-koan smi application/smil smil application/smil snd audio/basic so application/octet-stream spl application/x-futuresplash src application/x-wais-source sv4cpio application/x-sv4cpio sv4crc application/x-sv4crc swf application/x-shockwave-flash t application/x-troff tar application/x-tar tcl application/x-tcl tex application/x-tex texi application/x-texinfo texinfo application/x-texinfo tif image/tiff tiff image/tiff tr application/x-troff tsv text/tab-separated-values txt text/plain ustar application/x-ustar vcd application/x-cdlink vrml model/vrml wav audio/x-wav wbmp image/vnd.wap.wbmp wbxml application/vnd.wap.wbxml wml text/vnd.wap.wml wmlc application/vnd.wap.wmlc wmls text/vnd.wap.wmlscript wmlsc application/vnd.wap.wmlscriptc wrl model/vrml xbm image/x-xbitmap xht application/xhtml+xml xhtml application/xhtml+xml xls application/vnd.ms-excel xml text/xml xpm image/x-xpixmap xsl text/xml xwd image/x-xwindowdump xyz chemical/x-xyz zip application/zip
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