Common HTTP contenttype settings for Ajax applications

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In Ajax development, we often encounter the following situations:

1. The server must return a piece of plain text to the client.
2. The server must return an HTML code to the client.
3. The server must return an XML code to the client.
4. The server must return a piece of JavaScript code to the client.
5. The server must return a JSON string to the client.

 

For each return type, the standard practice is to specify the contenttype of response on the server.
(Of course, there is no problem in most cases, especially when "non-xml" is returned)

Code
Plain text: text/plain
HTML code: text/html
XML code: text/XML
The above three cases are not controversial, but you should pay attention to the other two cases.
Javascript contenttype should be written in the most standard format: Application/JavaScript.
The commonly used text/JavaScript has been defined as obsolete by RFC.
However, application/JavaScript is not recommended for the moment.
Because many old Browsers Do not support application/JavaScript
All browsers support text/JavaScript.
Select the latter for the moment between the standard and extensive compatibility.

JSON contenttype is commonly written in the following ways: text/JSON & text/JavaScript.
However, this text/JSON does not exist at all, and text/JavaScript may be ambiguous when processed by the client.
For JSON contenttype, the standard syntax defined in RFC is: Application/JSON.

There is no doubt that we should select the standard format of application/JSON

 

Finally, a list of contenttypes is provided:

Common:

Text/plain <br/> text/html <br/> text/XML <br/> test/JavaScript <br/> application/JSON <br/> image/GIF <br /> image/JPEG <br/>

List:

". * "=" Application/octet-stream "<br/> ". 001 "=" application/x-001 "<br/> ". 301 "=" application/x-301 "<br/> ". 323 "=" text/h323 "<br/> ". 906 "=" application/x-906 "<br/> ". 907 "=" Drawing/907 "<br/> ". a11 "=" application/x-a11 "<br/> ". ACP "=" audio/X-Mei-AAC "<br/> ". AI "=" application/postscript "<br/> ". AIF "=" audio/AIFF "<br/> ". aifc "=" audio/AIFF "<br/> ". AIFF "=" audio/AIFF "<br/> ". anv "=" application/X-anv "<br/> ". asa "=" text/asa "<br/> ". ASF "=" Video/X-MS-ASF "<br/> ". ASP "=" text/asp "<br/> ". ASX "=" Video/X-MS-ASF "<br/> ". au "=" audio/basic "<br/> ". avi "=" Video/Avi "<br/> ". AWF "=" application/vnd. adobe. workflow "<br/> ". biz "=" text/XML "<br/> ". BMP "=" application/X-BMP "<br/> ". bot "=" application/X-bot "<br/> ". c4t "=" application/x-c4t "<br/> ". c90 "=" application/x-c90 "<br/> ". cal "=" application/X-cals "<br/> ". cat "=" application/vnd. ms-pki.seccat "<br/> ". CDF "=" application/X-netcdf "<br/> ". CDR "=" application/X-CDR "<br/> ". cel "=" application/X-Cel "<br/> ". CER "=" application/x-x509-ca-cert "<br/> ". cg4 "=" application/x-g4 "<br/> ". CGM "=" application/X-CGM "<br/> ". CIT "=" application/X-CIT "<br/> ". class "=" Java/* "<br/> ". CRF "=" text/XML "<br/> ". CMP "=" application/X-CMP "<br/> ". cmx "=" application/X-cmx "<br/> ". COT "=" application/X-cot "<br/> ". CRL "=" application/pkix-CRL "<br/> ". CRT "=" application/x-x509-ca-cert "<br/> ". CSI "=" application/X-CSI "<br/> ". CSS "=" text/CSS "<br/> ". cut "=" application/X-cut "<br/> ". DBF "=" application/X-DBF "<br/> ". DBM "=" application/X-dBm "<br/> ". dbx "=" application/X-dbx "<br/> ". DCD "=" text/XML "<br/> ". dcx "=" application/X-dcx "<br/> ". der "=" application/x-x509-ca-cert "<br/> ". dgn "=" application/X-dgn "<br/> ". diB "=" application/X-dib "<br/> ". DLL "=" application/X-msdownload "<br/> ". doc "=" application/MSWord "<br/> ". dot "=" application/MSWord "<br/> ". drw "=" application/X-drw "<br/> ". DTD "=" text/XML "<br/> ". dwF "=" model/vnd. dwF "<br/> ". dwF "=" application/X-DwF "<br/> ". DWG "=" application/X-DWG "<br/> ". dxb "=" application/X-dxb "<br/> ". DXF "=" application/X-DXF "<br/> ". edn "=" application/vnd. adobe. edn "<br/> ". EMF "=" application/X-EMF "<br/> ". eml "=" message/rfc822 "<br/> ". ent "=" text/XML "<br/> ". EPI "=" application/X-epi "<br/> ". EPS "=" application/X-Ps "<br/> ". EPS "=" application/postscript "<br/> ". ETD "=" application/X-EBX "<br/> ". EXE "=" application/X-msdownload "<br/> ". fax "=" image/fax "<br/> ". FDF "=" application/vnd. FDF "<br/> ". fif "=" application/Fractals "<br/> ". FO "=" text/XML "<br/> ". FRM "=" application/X-frm "<br/> ". g4 "=" application/x-g4 "<br/> ". GBR "=" application/X-GBR "<br/> ". GCD "=" application/X-GCD "<br/> ". GIF "=" image/GIF "<br/> ". gl2 "=" application/x-gl2 "<br/> ". gp4 "=" application/x-gp4 "<br/> ". hgl "=" application/X-hgl "<br/> ". hmr "=" application/X-hmr "<br/> ". HPG "=" application/X-HPGL "<br/> ". hpl "=" application/X-hpl "<br/> ". hqx "=" application/mac-binhex40 "<br/> ". HRF "=" application/X-HRF "<br/> ". HTA "=" application/HTA "<br/> ". HTC "=" text/X-component "<br/> ". htm "=" text/html "<br/> ". html "=" text/html "<br/> ". htt "=" text/webviewhtml "<br/> ". htx "=" text/html "<br/> ". ICB "=" application/X-ICB "<br/> ". ICO "=" image/X-icon "<br/> ". ICO "=" application/X-ICO "<br/> ". IFF "=" application/X-Iff "<br/> ". ig4 "=" application/x-g4 "<br/> ". IG "=" application/X-ig "<br/> ". III "=" application/X-iPhone "<br/> ". IMG "=" application/X-IMG "<br/> ". INS "=" application/X-Internet-signup "<br/> ". ISP "=" application/X-Internet-signup "<br/> ". IVF "=" Video/X-IVF "<br/> ". java "=" Java/* "<br/> ". jfif "=" image/JPEG "<br/> ". jpe "=" image/JPEG "<br/> ". jpe "=" application/X-jpe "<br/> ". JPEG "=" image/JPEG "<br/> ". jpg "=" image/JPEG "<br/> ". jpg "=" application/X-jpg "<br/> ". JS "=" application/X-JavaScript "<br/> ". JSP "=" text/html "<br/> ". la1 "=" audio/X-liquid-file "<br/> ". lar "=" application/X-laplayer-Reg "<br/> ". latex "=" application/X-latex "<br/> ". LAVS "=" audio/X-liquid-secure "<br/> ". LBM "=" application/X-LBM "<br/> ". lmsff "=" audio/X-la-LMS "<br/> ". ls "=" application/X-JavaScript "<br/> ". LTr "=" application/X-LTR "<br/> ". m1v "=" Video/X-mPEG "<br/> ". m2v "=" Video/X-mPEG "<br/> ". m3U "=" audio/mpegurl "<br/> ". m4e "=" Video/MPEG4 "<br/> ". mac "=" application/X-Mac "<br/> ". man "=" application/X-troff-man "<br/> ". math "=" text/XML "<br/> ". mdb "=" application/msaccess "<br/> ". mdb "=" application/X-mdb "<br/> ". MFP "=" application/X-Shockwave-flash "<br/> ". MHT "=" message/rfc822 "<br/> ". MHTML "=" message/rfc822 "<br/> ". mi "=" application/X-MI "<br/> ". mid "=" audio/mid "<br/> ". midi "=" audio/mid "<br/> ". mil "=" application/X-mil "<br/> ". MML "=" text/XML "<br/> ". MND "=" audio/X-MusicNet-download "<br/> ". MNS "=" audio/X-MusicNet-stream "<br/> ". mocha "=" application/X-JavaScript "<br/> ". movie "=" Video/X-SGI-movie "<br/> ". MP1 "=" audio/MP1 "<br/> ". MP2 "=" audio/MP2 "<br/> ". mp2v "=" Video/MPEG "<br/> ". MP3 "=" audio/MP3 "<br/> ". MP4 "=" Video/MPEG4 "<br/> ". MPa "=" Video/X-MPG "<br/> ". MPD "=" application/vnd. MS-project "<br/> ". MPE "=" Video/X-mPEG "<br/> ". MPEG "=" Video/MPG "<br/> ". MPG "=" Video/MPG "<br/> ". mpga "=" audio/RN-mPEG "<br/> ". MPP "=" application/vnd. MS-project "<br/> ". MPs "=" Video/X-mPEG "<br/> ". MPT "=" application/vnd. MS-project "<br/> ". MPV "=" Video/MPG "<br/> ". MPV2 "=" Video/MPEG "<br/> ". MPW "=" application/vnd. MS-project "<br/> ". MPX "=" application/vnd. MS-project "<br/> ". (delete). (delete ". mxp "=" application/X-mmxp "<br/> ". net "=" image/pnetvue "<br/> ". NRF "=" application/X-NRF "<br/> ". NWS "=" message/rfc822 "<br/> ". ODC "=" text/X-MS-ODC "<br/> ". out "=" application/X-out "<br/> ". p10 "=" application/pkcs10 "<br/> ". p12 "=" application/x-pkcs12 "<br/> ". p7b "=" application/x-pkcs7-certificates "<br/> ". p7c "=" application/pkcs7-mime "<br/> ". p7m "=" application/pkcs7-mime "<br/> ". p7r "=" application/x-pkcs7-certreqresp "<br/> ". p7s "=" application/pkcs7-signature "<br/> ". pc5 "=" application/x-pc5 "<br/> ". PCI "=" application/X-PCI "<br/> ". PCL "=" application/X-PCL "<br/> ". PCX "=" application/X-PCX "<br/> ". PDF "=" application/pdf "<br/> ". PDF "=" application/pdf "<br/> ". PDX "=" application/vnd. adobe. PDX "<br/> ". pfx "=" application/x-pkcs12 "<br/> ". PGL "=" application/X-PGL "<br/> ". PIC "=" application/X-pic "<br/> ". PKO "=" application/vnd. ms-pki.pko "<br/> ". PL "=" application/X-perl "<br/> ". PLG "=" text/html "<br/> ". pls "=" audio/scpls "<br/> ". PLT "=" application/X-PLT "<br/> ". PNG "=" image/PNG "<br/> ". PNG "=" application/X-PNG "<br/> ". pot "=" application/vnd. MS-PowerPoint "<br/> ". PPA "=" application/vnd. MS-PowerPoint "<br/> ". PPM "=" application/X-ppm "<br/> ". PPS "=" application/vnd. MS-PowerPoint "<br/> ". ppt "=" application/vnd. MS-PowerPoint "<br/> ". ppt "=" application/X-ppt "<br/> ". PR "=" application/X-Pr "<br/> ". PRF "=" application/pics-Rules "<br/> ". PRN "=" application/X-PRN "<br/> ". PRT "=" application/X-PRT "<br/> ". ps "=" application/X-Ps "<br/> ". ps "=" application/postscript "<br/> ". PTN "=" application/X-PTN "<br/> ". pwz "=" application/vnd. MS-PowerPoint "<br/> ". r3t "=" text/vnd. rn-realtext3d "<br/> ". RA "=" audio/vnd. rn-RealAudio "<br/> ". ram "=" audio/X-PN-RealAudio "<br/> ". RAS "=" application/X-ras "<br/> ". rat "=" application/rat-file "<br/> ". RDF "=" text/XML "<br/> ". REC "=" application/vnd. rn-recording "<br/> ". red "=" application/X-red "<br/> ". RGB "=" application/X-RGB "<br/> ". RJS "=" application/vnd. rn-RealSystem-RJS "<br/> ". rjt "=" application/vnd. rn-RealSystem-rjt "<br/> ". RLC "=" application/X-RLC "<br/> ". rle "=" application/X-RLE "<br/> ". RM "=" application/vnd. rn-RealMedia "<br/> ". RMF "=" application/vnd. adobe. RMF "<br/> ". RMI "=" audio/mid "<br/> ". rmj "=" application/vnd. rn-RealSystem-rmj "<br/> ". RMM "=" audio/X-PN-RealAudio "<br/> ". RMP "=" application/vnd. rn-rn_music_package "<br/> ". RMS "=" application/vnd. rn-RealMedia-secure "<br/> ". rmvb "=" application/vnd. rn-RealMedia-VBr "<br/> ". RMX "=" application/vnd. rn-RealSystem-RMX "<br/> ". rnx "=" application/vnd. rn-RealPlayer "<br/> ". RP "=" image/vnd. rn-realpix "<br/> ". rpm "=" audio/X-PN-RealAudio-plugin "<br/> ". rsml "=" application/vnd. rn-rsml "<br/> ". RT "=" text/vnd. rn-RealText "<br/> ". rtf "=" application/MSWord "<br/> ". rtf "=" application/X-rtf "<br/> ". RV "=" Video/vnd. rn-realvideo "<br/> ". sam "=" application/X-Sam "<br/> ". sat "=" application/X-sat "<br/> ". SDP "=" application/SDP "<br/> ". SDW "=" application/X-SDW "<br/> ". sit "=" application/X-stuffit "<br/> ". SLB "=" application/X-SLB "<br/> ". SLD "=" application/X-SLD "<br/> ". SLK "=" Drawing/X-SLK "<br/> ". SMI "=" application/smil "<br/> ". SMIL "=" application/smil "<br/> ". SMK "=" application/X-SMK "<br/> ". SND "=" audio/basic "<br/> ". sol "=" text/plain "<br/> ". sor "=" text/plain "<br/> ". SPC "=" application/x-pkcs7-certificates "<br/> ". SPL "=" application/futuresplash "<br/> ". SPP "=" text/XML "<br/> ". SSM "=" application/streamingmedia "<br/> ". SST "=" application/vnd. ms-pki.certstore "<br/> ". STL "=" application/vnd. ms-pki.stl "<br/> ". stm "=" text/html "<br/> ". sty "=" application/X-Sty "<br/> ". SVG "=" text/XML "<br/> ". SWF "=" application/X-Shockwave-flash "<br/> ". TDF "=" application/X-TDF "<br/> ". TG4 "=" application/x-tg4 "<br/> ". TGA "=" application/X-TGA "<br/> ". TIF "=" image/tiff "<br/> ". TIF "=" application/X-TIF "<br/> ". tiff "=" image/tiff "<br/> ". TLD "=" text/XML "<br/> ". top "=" Drawing/X-top "<br/> ". torrent "=" application/X-BitTorrent "<br/> ". TSD "=" text/XML "<br/> ". TXT "=" text/plain "<br/> ". uin "=" application/X-ICQ "<br/> ". ULS "=" text/iuls "<br/> ". VCF "=" text/X-vCard "<br/> ". VDA "=" application/X-VDA "<br/> ". vdx "=" application/vnd. visio "<br/> ". VML "=" text/XML "<br/> ". VPG "=" application/x-vpeg005 "<br/> ". sealing Method "=" application/vnd. visio "<br/> ". sealing "=" application/X-sealing "<br/> ". VSS "=" application/vnd. visio "<br/> ". VST "=" application/vnd. visio "<br/> ". VST "=" application/X-VST "<br/> ". vsw "=" application/vnd. visio "<br/> ". vsx "=" application/vnd. visio "<br/> ". vtx "=" application/vnd. visio "<br/> ". VXML "=" text/XML "<br/> ". wav "=" audio/WAV "<br/> ". wax "=" audio/X-MS-wax "<br/> ". wb1 "=" application/x-wb1 "<br/> ". wb2 "=" application/x-wb2 "<br/> ". wb3 "=" application/x-wb3 "<br/> ". wbmp "=" image/vnd. WAP. wbmp "<br/> ". wiz "=" application/MSWord "<br/> ". wk3 "=" application/x-wk3 "<br/> ". wk4 "=" application/x-wk4 "<br/> ". wkq "=" application/X-wkq "<br/> ". wks "=" application/X-wks "<br/> ". wm "=" Video/X-MS-WM "<br/> ". WMA "=" audio/X-MS-WMA "<br/> ". WMD "=" application/X-MS-WMD "<br/> ". WMF "=" application/X-WMF "<br/> ". WML "=" text/vnd. WAP. WML "<br/> ". WMV "=" Video/X-MS-WMV "<br/> ". wmx "=" Video/X-MS-wmx "<br/> ". WMZ "=" application/X-MS-WMZ "<br/> ". WP6 "=" application/x-wp6 "<br/> ". WPD "=" application/X-WPD "<br/> ". WPG "=" application/X-WPG "<br/> ". WPL "=" application/vnd. MS-WPL "<br/> ". wq1 "=" application/x-wq1 "<br/> ". wr1 "=" application/x-wr1 "<br/> ". WRI "=" application/X-WRI "<br/> ". wrk "=" application/X-wrk "<br/> ". WS "=" application/X-ws "<br/> ". WS2 "=" application/X-ws "<br/> ". WSC "=" text/scriptlet "<br/> ". WSDL "=" text/XML "<br/> ". WVX "=" Video/X-MS-WVX "<br/> ". XDP "=" application/vnd. adobe. XDP "<br/> ". XDR "=" text/XML "<br/> ". XFD "=" application/vnd. adobe. XFD "<br/> ". XFDF "=" application/vnd. adobe. XFDF "<br/> ". XHTML "=" text/html "<br/> ". xls "=" application/vnd. MS-excel "<br/> ". xls "=" application/X-xls "<br/> ". xlw "=" application/X-xlw "<br/> ". XML "=" text/XML "<br/> ". xpl "=" audio/scpls "<br/> ". XQ "=" text/XML "<br/> ". xql "=" text/XML "<br/> ". XQuery "=" text/XML "<br/> ". XSD "=" text/XML "<br/> ". XSL "=" text/XML "<br/> ". XSLT "=" text/XML "<br/> ". xwd "=" application/X-xwd "<br/> ". x_ B "=" application/x-x_ B "<br/> ". x_t "=" application/x-x_t"