HTTP Protocol

...

Ports

HTTP is a text-based communication protocol that is used to communicate between Web browsers and Web servers, using port 80.

Secure HTTP (HTTPS) uses port 443.

Examples of HTTP Requests and Responses

An example of a simple Request would be:

GET /default.aspx HTTP/1.1
Host: www.xact-solutions.com

An example of a Request with parameters would be:

GET /Orders.aspx?UserId=A101&type=wool HTTP/1.1
Host: www.xact-solutions.com

An example of Postback Request would be:

POST /Orders.aspx HTTP/1.1
Host: www.xact-solutions.com

UserId=A101&type=wool

Whereas an example of a simple Response would be:

HTTP/1.1 200 OK
Server: Microsoft-IIS/6.0
Content-Type: text/html
Content-Length: 34
<html><body>Hi There!</body><html>

The first line states the Response code, the second line the content/type (expressed in mime), etc.

HTTP Verbs

HEAD: Retrieves the meta information for a resource. This information is typically identical to the meta information sent in response to a GET request, but the HEAD verb never returns the actual resource. The meta information is cacheable.
POST: Used to create a new, dynamically named resource. Data retrieved using this verb is typically not cached.
PUT: Allows a client to directly create a resource at the indicated URL on the server. The server takes the body of the request, creates the file specified in the URL, and copies the received data to the newly created file. If the file exists and is not locked, the content of the file will be overwritten.
DELETE: Used to delete a resource at the Web server. Requires write permissions on the directory.
TRACE: Used for testing or diagnostics; allows the client to see what is being received at the other end of the request chain. Responses to this method are never cached.
CONNECT: Reserved for use with a proxy that can dynamically switch to being a tunnel, such as Secure Socket Layer (SSL) protocol.
DEBUG: Is not defined in the HTTP/1.1 specification, but is used to start
ASP.NET debugging. Informs Visual Studio 2005 of the process that the debugger will attach to.

Status Codes

1xx Informational
- 100 Continue.
- 101: Switching Protocols.
2xx Success
- 200 OK
- 201 Created
- 202 Accepted
- 203 Non-Authoritative Information (*1.1)
- 204 No Content
- 205 Reset Content
- 206 Partial Content
  - Notice that a file has been partially downloaded. This is used by tools like wget to enable resuming of interrupted downloads, or split a download into multiple simultaneous streams.
3xx Redirection
- 300 Multiple Choices
  - Indicates multiple options for the resource that the client may follow. It, for instance, could be used to present different format options for video, list files with different extentions.
- 301 Moved Permenently
  - This and all future requests should be directed to the given URI.
- 302 Found
  - This is the most popular redirect code, but also an example of industrial practice contradicting the standard. HTTP/1.0 specification (RFC 1945) required the client to perform a temporary redirect (the original describing phrase was "Moved Temporarily"), but popular browsers implemented it as a 303 See Other.
    Therefore, HTTP/1.1 added status codes 303 and 307 to disambiguate between the two behaviours. However, the majority of Web applications and frameworks still use the 302 status code as if it were the 303.
- 303 See Other (since HTTP/1.1)
  - The response to the request can be found under another URI using a GET method.
- 304 Not Modified
  - Indicates the resource has not been modified since last requested. Typically, the HTTP client provides a header like the If-Modified-Since header to provide a time against which to compare. Utilizing this saves bandwidth and reprocessing on both the server and client.
- 305 Use Proxy (since HTTP/1.1)
  - Many HTTP clients don't correctly handle responses with this status code, primarily for security reasons.
- ~~306 Switch Proxy~~: No longer used.
- 307 Temporary Redirect (since HTTP/1.1)
  - In this occasion, the request should be repeated with another URI, but future requests can still use the original URI. In contrast to 303, the request method should not be changed when reissuing the original request. For instance, a POST request must be repeated using another POST request.
4xx Client Error
- 400 Bad Request
  - The request contains bad syntax or cannot be fulfilled
- 401 Unauthorized
  - Similar to 403 Forbidden, but specifically for use when authentication is possible but has failed or not yet been provided.
- 402 Payment Required
  - The original intention was that this code might be used as part of some form of digital cash scheme, but that has not happened, and this code has never been used.
- 403 Forbidden
  - The request was a legal request, but the server is refusing to respond to it.
    Unlike a 401 Unauthorized response, authenticating will make no difference.
- 404 Not Found
  - The requested resource could not be found but may be available again in the future.
    Subsequent requests by the client are permissible.
- 405 Method Not Allowed
  - A request was made of a resource using a request method not supported by that resource; for example, using GET on a form which requires data to be presented via POST, or using PUT on a read-only resource.
- 406 Not Acceptable
- 407 Proxy Authentication Required
- 408 Request Timeout
  - Client failed to continue the reque
- 409 Conflict
- 410 Gone
  - Indicates that the resource requested is no longer available and will not be available again.
    This should be used when a resource has been intentionally removed; however, in practice, a 404 Not Found is often issued instead.
    Upon receiving a 410 status code, the client should not request the resource again in the future. Clients such as search engines should remove the resource from their indexes to prevent repeated requests.
- 411 Length Required
- 412 Precondition Failed
- 413 Request Entity Too Large
- 414 Request-URI Too Long
- 415 Unsupported Media Type
- 416 Requested Range Not Satisfiable
  - The client has asked for a portion of the file, but the server cannot supply that portion (for example, if the client asked for a part of the file that lies beyond the end of the file).
- 417 Expectation Failed
5xx Server Error
- 500 Internal Server Error
- 501 Not Implemented
- 502 Bad Gateway
- 503 Service Unavailable
- 504 Gateway Timeout
- 505 HTTP Version Not Supported

Common Common Types (MIME)

Extension	Mime
.3dm	x-world/x-3dmf
.3dmf	x-world/x-3dmf
.a	application/octet-stream
.aab	application/x-authorware-bin
.aam	application/x-authorware-map
.aas	application/x-authorware-seg
.abc	text/vnd.abc
.acgi	text/html
.afl	video/animaflex
.ai	application/postscript
.aif	audio/aiff
.aif	audio/x-aiff
.aifc	audio/aiff
.aifc	audio/x-aiff
.aiff	audio/aiff
.aiff	audio/x-aiff
.aim	application/x-aim
.aip	text/x-audiosoft-intra
.ani	application/x-navi-animation
.aos	application/x-nokia-9000-communicator-add-on-software
.aps	application/mime
.arc	application/octet-stream
.arj	application/arj
.arj	application/octet-stream
.art	image/x-jg
.asf	video/x-ms-asf
.asm	text/x-asm
.asp	text/asp
.asx	application/x-mplayer2
.asx	video/x-ms-asf
.asx	video/x-ms-asf-plugin
.au	audio/basic
.au	audio/x-au
.avi	application/x-troff-msvideo
.avi	video/avi
.avi	video/msvideo
.avi	video/x-msvideo
.avs	video/avs-video
.bcpio	application/x-bcpio
.bin	application/mac-binary
.bin	application/macbinary
.bin	application/octet-stream
.bin	application/x-binary
.bin	application/x-macbinary
.bm	image/bmp
.bmp	image/bmp
.bmp	image/x-windows-bmp
.boo	application/book
.book	application/book
.boz	application/x-bzip2
.bsh	application/x-bsh
.bz	application/x-bzip
.bz2	application/x-bzip2
.c	text/plain
.c	text/x-c
.c++	text/plain
.cat	application/vnd.ms-pki.seccat
.cc	text/plain
.cc	text/x-c
.ccad	application/clariscad
.cco	application/x-cocoa
.cdf	application/cdf
.cdf	application/x-cdf
.cdf	application/x-netcdf
.cer	application/pkix-cert
.cer	application/x-x509-ca-cert
.cha	application/x-chat
.chat	application/x-chat
.class	application/java
.class	application/java-byte-code
.class	application/x-java-class
.com	application/octet-stream
.com	text/plain
.conf	text/plain
.cpio	application/x-cpio
.cpp	text/x-c
.cpt	application/mac-compactpro
.cpt	application/x-compactpro
.cpt	application/x-cpt
.crl	application/pkcs-crl
.crl	application/pkix-crl
.crt	application/pkix-cert
.crt	application/x-x509-ca-cert
.crt	application/x-x509-user-cert
.csh	application/x-csh
.csh	text/x-script.csh
.css	application/x-pointplus
.css	text/css
.cxx	text/plain
.dcr	application/x-director
.deepv	application/x-deepv
.def	text/plain
.der	application/x-x509-ca-cert
.dif	video/x-dv
.dir	application/x-director
.dl	video/dl
.dl	video/x-dl
.doc	application/msword
.dot	application/msword
.dp	application/commonground
.drw	application/drafting
.dump	application/octet-stream
.dv	video/x-dv
.dvi	application/x-dvi
.dwf	drawing/x-dwf (old)
.dwf	model/vnd.dwf
.dwg	application/acad
.dwg	image/vnd.dwg
.dwg	image/x-dwg
.dxf	application/dxf
.dxf	image/vnd.dwg
.dxf	image/x-dwg
.dxr	application/x-director
.el	text/x-script.elisp
.elc	application/x-bytecode.elisp (Compiled ELisp)
.elc	application/x-elc
.env	application/x-envoy
.eps	application/postscript
.es	application/x-esrehber
.etx	text/x-setext
.evy	application/envoy
.evy	application/x-envoy
.exe	application/octet-stream
.f	text/plain
.f	text/x-fortran
.f77	text/x-fortran
.f90	text/plain
.f90	text/x-fortran
.fdf	application/vnd.fdf
.fif	application/fractals
.fif	image/fif
.fli	video/fli
.fli	video/x-fli
.flo	image/florian
.flx	text/vnd.fmi.flexstor
.fmf	video/x-atomic3d-feature
.for	text/plain
.for	text/x-fortran
.fpx	image/vnd.fpx
.fpx	image/vnd.net-fpx
.frl	application/freeloader
.funk	audio/make
.g	text/plain
.g3	image/g3fax
.gif	image/gif
.gl	video/gl
.gl	video/x-gl
.gsd	audio/x-gsm
.gsm	audio/x-gsm
.gsp	application/x-gsp
.gss	application/x-gss
.gtar	application/x-gtar
.gz	application/x-compressed
.gz	application/x-gzip
.gzip	application/x-gzip
.gzip	multipart/x-gzip
.h	text/plain
.h	text/x-h
.hdf	application/x-hdf
.help	application/x-helpfile
.hgl	application/vnd.hp-HPGL
.hh	text/plain
.hh	text/x-h
.hlb	text/x-script
.hlp	application/hlp
.hlp	application/x-helpfile
.hlp	application/x-winhelp
.hpg	application/vnd.hp-HPGL
.hpgl	application/vnd.hp-HPGL
.hqx	application/binhex
.hqx	application/binhex4
.hqx	application/mac-binhex
.hqx	application/mac-binhex40
.hqx	application/x-binhex40
.hqx	application/x-mac-binhex40
.hta	application/hta
.htc	text/x-component
.htm	text/html
.html	text/html
.htmls	text/html
.htt	text/webviewhtml
.htx	text/html
.ice	x-conference/x-cooltalk
.ico	image/x-icon
.idc	text/plain
.ief	image/ief
.iefs	image/ief
.iges	application/iges
.iges	model/iges
.igs	application/iges
.igs	model/iges
.ima	application/x-ima
.imap	application/x-httpd-imap
.inf	application/inf
.ins	application/x-internett-signup
.ip	application/x-ip2
.isu	video/x-isvideo
.it	audio/it
.iv	application/x-inventor
.ivr	i-world/i-vrml
.ivy	application/x-livescreen
.jam	audio/x-jam
.jav	text/plain
.jav	text/x-java-source
.java	text/plain
.java	text/x-java-source
.jcm	application/x-java-commerce
.jfif	image/jpeg
.jfif	image/pjpeg
.jfif-tbnl	image/jpeg
.jpe	image/jpeg
.jpe	image/pjpeg
.jpeg	image/jpeg
.jpeg	image/pjpeg
.jpg	image/jpeg
.jpg	image/pjpeg
.jps	image/x-jps
.js	application/x-javascript
.jut	image/jutvision
.kar	audio/midi
.kar	music/x-karaoke
.ksh	application/x-ksh
.ksh	text/x-script.ksh
.la	audio/nspaudio
.la	audio/x-nspaudio
.lam	audio/x-liveaudio
.latex	application/x-latex
.lha	application/lha
.lha	application/octet-stream
.lha	application/x-lha
.lhx	application/octet-stream
.list	text/plain
.lma	audio/nspaudio
.lma	audio/x-nspaudio
.log	text/plain
.lsp	application/x-lisp
.lsp	text/x-script.lisp
.lst	text/plain
.lsx	text/x-la-asf
.ltx	application/x-latex
.lzh	application/octet-stream
.lzh	application/x-lzh
.lzx	application/lzx
.lzx	application/octet-stream
.lzx	application/x-lzx
.m	text/plain
.m	text/x-m
.m1v	video/mpeg
.m2a	audio/mpeg
.m2v	video/mpeg
.m3u	audio/x-mpequrl
.man	application/x-troff-man
.map	application/x-navimap
.mar	text/plain
.mbd	application/mbedlet
.mc$	application/x-magic-cap-package-1.0
.mcd	application/mcad
.mcd	application/x-mathcad
.mcf	image/vasa
.mcf	text/mcf
.mcp	application/netmc
.me	application/x-troff-me
.mht	message/rfc822
.mhtml	message/rfc822
.mid	application/x-midi
.mid	audio/midi
.mid	audio/x-mid
.mid	audio/x-midi
.mid	music/crescendo
.mid	x-music/x-midi
.midi	application/x-midi
.midi	audio/midi
.midi	audio/x-mid
.midi	audio/x-midi
.midi	music/crescendo
.midi	x-music/x-midi
.mif	application/x-frame
.mif	application/x-mif
.mime	message/rfc822
.mime	www/mime
.mjf	audio/x-vnd.AudioExplosion.MjuiceMediaFile
.mjpg	video/x-motion-jpeg
.mm	application/base64
.mm	application/x-meme
.mme	application/base64
.mod	audio/mod
.mod	audio/x-mod
.moov	video/quicktime
.mov	video/quicktime
.movie	video/x-sgi-movie
.mp2	audio/mpeg
.mp2	audio/x-mpeg
.mp2	video/mpeg
.mp2	video/x-mpeg
.mp2	video/x-mpeq2a
.mp3	audio/mpeg3
.mp3	audio/x-mpeg-3
.mp3	video/mpeg
.mp3	video/x-mpeg
.mpa	audio/mpeg
.mpa	video/mpeg
.mpc	application/x-project
.mpe	video/mpeg
.mpeg	video/mpeg
.mpg	audio/mpeg
.mpg	video/mpeg
.mpga	audio/mpeg
.mpp	application/vnd.ms-project
.mpt	application/x-project
.mpv	application/x-project
.mpx	application/x-project
.mrc	application/marc
.ms	application/x-troff-ms
.mv	video/x-sgi-movie
.my	audio/make
.mzz	application/x-vnd.AudioExplosion.mzz
.nap	image/naplps
.naplps	image/naplps
.nc	application/x-netcdf
.ncm	application/vnd.nokia.configuration-message
.nif	image/x-niff
.niff	image/x-niff
.nix	application/x-mix-transfer
.nsc	application/x-conference
.nvd	application/x-navidoc
.o	application/octet-stream
.oda	application/oda
.omc	application/x-omc
.omcd	application/x-omcdatamaker
.omcr	application/x-omcregerator
.p	text/x-pascal
.p10	application/pkcs10
.p10	application/x-pkcs10
.p12	application/pkcs-12
.p12	application/x-pkcs12
.p7a	application/x-pkcs7-signature
.p7c	application/pkcs7-mime
.p7c	application/x-pkcs7-mime
.p7m	application/pkcs7-mime
.p7m	application/x-pkcs7-mime
.p7r	application/x-pkcs7-certreqresp
.p7s	application/pkcs7-signature
.part	application/pro_eng
.pas	text/pascal
.pbm	image/x-portable-bitmap
.pcl	application/vnd.hp-PCL
.pcl	application/x-pcl
.pct	image/x-pict
.pcx	image/x-pcx
.pdb	chemical/x-pdb
.pdf	application/pdf
.pfunk	audio/make
.pfunk	audio/make.my.funk
.pgm	image/x-portable-graymap
.pgm	image/x-portable-greymap
.pic	image/pict
.pict	image/pict
.pkg	application/x-newton-compatible-pkg
.pko	application/vnd.ms-pki.pko
.pl	text/plain
.pl	text/x-script.perl
.plx	application/x-PiXCLscript
.pm	image/x-xpixmap
.pm	text/x-script.perl-module
.pm4	application/x-pagemaker
.pm5	application/x-pagemaker
.png	image/png
.pnm	application/x-portable-anymap
.pnm	image/x-portable-anymap
.pot	application/mspowerpoint
.pot	application/vnd.ms-powerpoint
.pov	model/x-pov
.ppa	application/vnd.ms-powerpoint
.ppm	image/x-portable-pixmap
.pps	application/mspowerpoint
.pps	application/vnd.ms-powerpoint
.ppt	application/mspowerpoint
.ppt	application/powerpoint
.ppt	application/vnd.ms-powerpoint
.ppt	application/x-mspowerpoint
.ppz	application/mspowerpoint
.pre	application/x-freelance
.prt	application/pro_eng
.ps	application/postscript
.psd	application/octet-stream
.pvu	paleovu/x-pv
.pwz	application/vnd.ms-powerpoint
.py	text/x-script.phyton
.pyc	applicaiton/x-bytecode.python
.qcp	audio/vnd.qcelp
.qd3	x-world/x-3dmf
.qd3d	x-world/x-3dmf
.qif	image/x-quicktime
.qt	video/quicktime
.qtc	video/x-qtc
.qti	image/x-quicktime
.qtif	image/x-quicktime
.ra	audio/x-pn-realaudio
.ra	audio/x-pn-realaudio-plugin
.ra	audio/x-realaudio
.ram	audio/x-pn-realaudio
.ras	application/x-cmu-raster
.ras	image/cmu-raster
.ras	image/x-cmu-raster
.rast	image/cmu-raster
.rexx	text/x-script.rexx
.rf	image/vnd.rn-realflash
.rgb	image/x-rgb
.rm	application/vnd.rn-realmedia
.rm	audio/x-pn-realaudio
.rmi	audio/mid
.rmm	audio/x-pn-realaudio
.rmp	audio/x-pn-realaudio
.rmp	audio/x-pn-realaudio-plugin
.rng	application/ringing-tones
.rng	application/vnd.nokia.ringing-tone
.rnx	application/vnd.rn-realplayer
.roff	application/x-troff
.rp	image/vnd.rn-realpix
.rpm	audio/x-pn-realaudio-plugin
.rt	text/richtext
.rt	text/vnd.rn-realtext
.rtf	application/rtf
.rtf	application/x-rtf
.rtf	text/richtext
.rtx	application/rtf
.rtx	text/richtext
.rv	video/vnd.rn-realvideo
.s	text/x-asm
.s3m	audio/s3m
.saveme	application/octet-stream
.sbk	application/x-tbook
.scm	application/x-lotusscreencam
.scm	text/x-script.guile
.scm	text/x-script.scheme
.scm	video/x-scm
.sdml	text/plain
.sdp	application/sdp
.sdp	application/x-sdp
.sdr	application/sounder
.sea	application/sea
.sea	application/x-sea
.set	application/set
.sgm	text/sgml
.sgm	text/x-sgml
.sgml	text/sgml
.sgml	text/x-sgml
.sh	application/x-bsh
.sh	application/x-sh
.sh	application/x-shar
.sh	text/x-script.sh
.shar	application/x-bsh
.shar	application/x-shar
.shtml	text/html
.shtml	text/x-server-parsed-html
.sid	audio/x-psid
.sit	application/x-sit
.sit	application/x-stuffit
.skd	application/x-koan
.skm	application/x-koan
.skp	application/x-koan
.skt	application/x-koan
.sl	application/x-seelogo
.smi	application/smil
.smil	application/smil
.snd	audio/basic
.snd	audio/x-adpcm
.sol	application/solids
.spc	application/x-pkcs7-certificates
.spc	text/x-speech
.spl	application/futuresplash
.spr	application/x-sprite
.sprite	application/x-sprite
.src	application/x-wais-source
.ssi	text/x-server-parsed-html
.ssm	application/streamingmedia
.sst	application/vnd.ms-pki.certstore
.step	application/step
.stl	application/sla
.stl	application/vnd.ms-pki.stl
.stl	application/x-navistyle
.stp	application/step
.sv4cpio	application/x-sv4cpio
.sv4crc	application/x-sv4crc
.svf	image/vnd.dwg
.svf	image/x-dwg
.svr	application/x-world
.svr	x-world/x-svr
.swf	application/x-shockwave-flash
.t	application/x-troff
.talk	text/x-speech
.tar	application/x-tar
.tbk	application/toolbook
.tbk	application/x-tbook
.tcl	application/x-tcl
.tcl	text/x-script.tcl
.tcsh	text/x-script.tcsh
.tex	application/x-tex
.texi	application/x-texinfo
.texinfo	application/x-texinfo
.text	application/plain
.text	text/plain
.tgz	application/gnutar
.tgz	application/x-compressed
.tif	image/tiff
.tif	image/x-tiff
.tiff	image/tiff
.tiff	image/x-tiff
.tr	application/x-troff
.tsi	audio/tsp-audio
.tsp	application/dsptype
.tsp	audio/tsplayer
.tsv	text/tab-separated-values
.turbot	image/florian
.txt	text/plain
.uil	text/x-uil
.uni	text/uri-list
.unis	text/uri-list
.unv	application/i-deas
.uri	text/uri-list
.uris	text/uri-list
.ustar	application/x-ustar
.ustar	multipart/x-ustar
.uu	application/octet-stream
.uu	text/x-uuencode
.uue	text/x-uuencode
.vcd	application/x-cdlink
.vcs	text/x-vCalendar
.vda	application/vda
.vdo	video/vdo
.vew	application/groupwise
.viv	video/vivo
.viv	video/vnd.vivo
.vivo	video/vivo
.vivo	video/vnd.vivo
.vmd	application/vocaltec-media-desc
.vmf	application/vocaltec-media-file
.voc	audio/voc
.voc	audio/x-voc
.vos	video/vosaic
.vox	audio/voxware
.vqe	audio/x-twinvq-plugin
.vqf	audio/x-twinvq
.vql	audio/x-twinvq-plugin
.vrml	application/x-vrml
.vrml	model/vrml
.vrml	x-world/x-vrml
.vrt	x-world/x-vrt
.vsd	application/x-visio
.vst	application/x-visio
.vsw	application/x-visio
.w60	application/wordperfect6.0
.w61	application/wordperfect6.1
.w6w	application/msword
.wav	audio/wav
.wav	audio/x-wav
.wb1	application/x-qpro
.wbmp	image/vnd.wap.wbmp
.web	application/vnd.xara
.wiz	application/msword
.wk1	application/x-123
.wmf	windows/metafile
.wml	text/vnd.wap.wml
.wmlc	application/vnd.wap.wmlc
.wmls	text/vnd.wap.wmlscript
.wmlsc	application/vnd.wap.wmlscriptc
.word	application/msword
.wp	application/wordperfect
.wp5	application/wordperfect
.wp5	application/wordperfect6.0
.wp6	application/wordperfect
.wpd	application/wordperfect
.wpd	application/x-wpwin
.wq1	application/x-lotus
.wri	application/mswrite
.wri	application/x-wri
.wrl	application/x-world
.wrl	model/vrml
.wrl	x-world/x-vrml
.wrz	model/vrml
.wrz	x-world/x-vrml
.wsc	text/scriplet
.wsrc	application/x-wais-source
.wtk	application/x-wintalk
.xbm	image/x-xbitmap
.xbm	image/x-xbm
.xbm	image/xbm
.xdr	video/x-amt-demorun
.xgz	xgl/drawing
.xif	image/vnd.xiff
.xl	application/excel
.xla	application/excel
.xla	application/x-excel
.xla	application/x-msexcel
.xlb	application/excel
.xlb	application/vnd.ms-excel
.xlb	application/x-excel
.xlc	application/excel
.xlc	application/vnd.ms-excel
.xlc	application/x-excel
.xld	application/excel
.xld	application/x-excel
.xlk	application/excel
.xlk	application/x-excel
.xll	application/excel
.xll	application/vnd.ms-excel
.xll	application/x-excel
.xlm	application/excel
.xlm	application/vnd.ms-excel
.xlm	application/x-excel
.xls	application/excel
.xls	application/vnd.ms-excel
.xls	application/x-excel
.xls	application/x-msexcel
.xlt	application/excel
.xlt	application/x-excel
.xlv	application/excel
.xlv	application/x-excel
.xlw	application/excel
.xlw	application/vnd.ms-excel
.xlw	application/x-excel
.xlw	application/x-msexcel
.xm	audio/xm
.xml	application/xml
.xml	text/xml
.xmz	xgl/movie
.xpix	application/x-vnd.ls-xpix
.xpm	image/x-xpixmap
.xpm	image/xpm
.x-png	image/png
.xsr	video/x-amt-showrun
.xwd	image/x-xwd
.xwd	image/x-xwindowdump
.xyz	chemical/x-pdb
.z	application/x-compress
.z	application/x-compressed
.zip	application/x-compressed
.zip	application/x-zip-compressed
.zip	application/zip
.zip	multipart/x-zip
.zoo	application/octet-stream
.zsh	text/x-script.zsh