Let’s talk about how to use Node.js to build a static web server

How to useNode.jsto build a static web server? The following article will teach you step by step how to use Node.js to build a static web server. I hope it will be helpful to you!

1. The concept of dynamic and static servers

1.1 The concept of static Web server

We usually call itStatic Web Serveris astatic website. Its main feature is that all content on the server is ready-made and does not require additional processing on the backend. When we send a web page request to the static server, the server only needs to return the correspondinghtmlfile based on our request path (URL).

A static website refers to a website that is entirely composed of HTML (a subset of the Standard Universal Markup Language) code format pages, and all content is included in the web page file. Various visual dynamic effects can also appear on web pages, such as GIF animations, FLASH animations, rolling subtitles, etc. Websites are mainly composed of static pages and codes. Generally, file names are suffixed with htm, html, shtml, etc. ——Baidu Encyclopedia

Corresponding to static websites is our most commondynamic Web server. The biggest feature of this type of server is that all resources are usually not in the format ofhtml# It is stored in the form of ##, but requires back-end query data, and then returns it to the user after composing a web page. The content seen by each user may be different. For example, in the web server built byJava, we can useJSPto splice web pages to form a user-specific page.

(1) Dynamic web pages are based on database technology, which can greatly reduce the workload of website maintenance;

(2) Websites using dynamic web pages technology can achieve more functions , such as user registration, user login, online survey, user management, order management, etc.;

(3) Dynamic web pages are not actually web pages that exist independently on the server. The server only opens the file when the user requests it. Return a complete web page;

(4) "?" in dynamic web pages It is generally impossible for search engines to access all web pages from the database of a website, or due to technical considerations, search spiders do not crawl them Get the content after "?" in the URL. Therefore, websites using dynamic web pages need to do certain technical processing to adapt to the requirements of search engines when promoting search engines.

(5) Because a static website is not connected to a database, a large number of web pages must be created to have the effect of a dynamic website. Many of these web pages can only be fake web pages and cannot realize the functions of a dynamic website at all.

—— Baidu Encyclopedia

1.2 Advantages of Static Web Server

Since the static server does not require a back-end database, the structure is very simple , very suitable for scenarios such as document management and blogging. As far as blogging itself is concerned, I think static websites have the following characteristics:

• Requires low server configuration, and the most basic server can meet the performance needs of most people;

• The response speed is fast, the content is all ready-made

  html, you can get the results by accessing it directly;

• a

  htmlcorresponds to aurl, the content is stable and easy to be retrieved by search engines;

• is simple to create, you only need to prevent the file from being specified after the server is set up. The location is enough;

The above points are all for the static

blog system. If you use a purely static server to create a large-scale other type of website, it may be more expensive. .

1.3 Ways to build quickly

If individuals want to quickly build a static server, they can use

http- based onNode.jsserverpackage, you can complete the server setup in one minute. The steps are as follows:

• Download the

  http-serverpackage, remember to install it globally

npm i http-server -g

• Enter the server folder and start the server

http-server -a 127.0.0.1 -p 9999

The server will be started. The root directory is the directory where the server command is executed. .

Visit

localhost:9999and you can see all the files. The following is the content of my files:

If we click file name, you will get the corresponding file. For example, if we click

*.html, you can get the web page:

This looks like a

FTPServer, do we stop here?

No, a qualified programmer will only be happy if he has his hands full! !

二、 手撸指南

2.1 框架搭建

我们使用基础的Node.js内置模块即可完成搭建，所以不需要安装额外的工具包。

主要的工作是创建一个服务器目录，结构如下：

web_server/ //根目录 |- static/ | |- css/ | | |- style.css //样式 | |- js/ | | |- common.js //js | |- index.js //主页 |- app.js //服务器文件 |- mime.json //扩展名配置

2.2 Ctrl+C/V

• app.js

const http = require('http');const fs = require('fs')const url = require('url')const path = require('path')FileMimes = JSON.parse(fs.readFileSync('./mime.json').toString())http.createServer(function (req, res) { //1.获取地址 let pathname = url.parse(req.url).pathname pathname = pathname == '/' ? '/index.html' : pathname let extname = path.extname(pathname) //2.fs读取文件 if (pathname != '/favicon.ico') { fs.readFile('./static' + pathname, async (err, data) => { if (err) { res.writeHead(404, { 'Content-Type': 'text/html;charset="utf-8"' }) res.end(err.message) return } if (!err) { // 3. 针对不同的文件返回不同的内容头 let mime = FileMimes[extname] res.writeHead(200, { 'Content-Type': mime + ';charset="utf-8"' }) res.end(data) } }) }}).listen(8081);console.log('Server running at http://127.0.0.1:8081/');

• mime.json

{ ".323":"text/h323" , ".3gp":"video/3gpp" , ".aab":"application/x-authoware-bin" , ".aam":"application/x-authoware-map" , ".aas":"application/x-authoware-seg" , ".acx":"application/internet-property-stream" , ".ai":"application/postscript" , ".aif":"audio/x-aiff" , ".aifc":"audio/x-aiff" , ".aiff":"audio/x-aiff" , ".als":"audio/X-Alpha5" , ".amc":"application/x-mpeg" , ...//实在太长，就不贴这里了，文末有完整代码}

2.3 启动服务器

node ./app.js

启动效果如下：

PS E:\Code\Node\demos\03-static_web_server> node .\app.js Server running at http://127.0.0.1:8081/

访问localhost:8081即可得到index.html页面。

2.4 部署服务器（简单过程）

也可以部署到远端的服务器

1. 买服务器

当前流行的服务器提供商包括
- 腾讯云
- 阿里云
- 华为云

不过现在CSDN也来凑热闹了：CSDN云，CSDN好像是基于腾讯云的，价格上都差不多。

2. 买域名（非必须，可以使用IP直接访问）
3. 网站备案
4. 部署
静态网站的部署也非常简单，由于很少出错，而且需要经常启停上传新的博客文件，所以直接复制文件到服务器，然后使用

node ./app.js

就可以了。

三、总结

基于Node.js的静态服务器搭建非常简单，我们可以使用http-server包，也可以基于Node手写代码。

手写代码最核心的内容是mime.json文件，也就是对于不同的文件类型，赋予response不同的返回头。

文章结束

---

下面是mime.json代码（老长了）：

{ ".323":"text/h323" , ".3gp":"video/3gpp" , ".aab":"application/x-authoware-bin" , ".aam":"application/x-authoware-map" , ".aas":"application/x-authoware-seg" , ".acx":"application/internet-property-stream" , ".ai":"application/postscript" , ".aif":"audio/x-aiff" , ".aifc":"audio/x-aiff" , ".aiff":"audio/x-aiff" , ".als":"audio/X-Alpha5" , ".amc":"application/x-mpeg" , ".ani":"application/octet-stream" , ".apk":"application/vnd.android.package-archive" , ".asc":"text/plain" , ".asd":"application/astound" , ".asf":"video/x-ms-asf" , ".asn":"application/astound" , ".asp":"application/x-asap" , ".asr":"video/x-ms-asf" , ".asx":"video/x-ms-asf" , ".au":"audio/basic" , ".avb":"application/octet-stream" , ".avi":"video/x-msvideo" , ".awb":"audio/amr-wb" , ".axs":"application/olescript" , ".bas":"text/plain" , ".bcpio":"application/x-bcpio" , ".bin ":"application/octet-stream" , ".bld":"application/bld" , ".bld2":"application/bld2" , ".bmp":"image/bmp" , ".bpk":"application/octet-stream" , ".bz2":"application/x-bzip2" , ".c":"text/plain" , ".cal":"image/x-cals" , ".cat":"application/vnd.ms-pkiseccat" , ".ccn":"application/x-cnc" , ".cco":"application/x-cocoa" , ".cdf":"application/x-cdf" , ".cer":"application/x-x509-ca-cert" , ".cgi":"magnus-internal/cgi" , ".chat":"application/x-chat" , ".class":"application/octet-stream" , ".clp":"application/x-msclip" , ".cmx":"image/x-cmx" , ".co":"application/x-cult3d-object" , ".cod":"image/cis-cod" , ".conf":"text/plain" , ".cpio":"application/x-cpio" , ".cpp":"text/plain" , ".cpt":"application/mac-compactpro" , ".crd":"application/x-mscardfile" , ".crl":"application/pkix-crl" , ".crt":"application/x-x509-ca-cert" , ".csh":"application/x-csh" , ".csm":"chemical/x-csml" , ".csml":"chemical/x-csml" , ".css":"text/css" , ".cur":"application/octet-stream" , ".dcm":"x-lml/x-evm" , ".dcr":"application/x-director" , ".dcx":"image/x-dcx" , ".der":"application/x-x509-ca-cert" , ".dhtml":"text/html" , ".dir":"application/x-director" , ".dll":"application/x-msdownload" , ".dmg":"application/octet-stream" , ".dms":"application/octet-stream" , ".doc":"application/msword" , ".docx":"application/vnd.openxmlformats-officedocument.wordprocessingml.document" , ".dot":"application/msword" , ".dvi":"application/x-dvi" , ".dwf":"drawing/x-dwf" , ".dwg":"application/x-autocad" , ".dxf":"application/x-autocad" , ".dxr":"application/x-director" , ".ebk":"application/x-expandedbook" , ".emb":"chemical/x-embl-dl-nucleotide" , ".embl":"chemical/x-embl-dl-nucleotide" , ".eps":"application/postscript" , ".epub":"application/epub+zip" , ".eri":"image/x-eri" , ".es":"audio/echospeech" , ".esl":"audio/echospeech" , ".etc":"application/x-earthtime" , ".etx":"text/x-setext" , ".evm":"x-lml/x-evm" , ".evy":"application/envoy" , ".exe":"application/octet-stream" , ".fh4":"image/x-freehand" , ".fh5":"image/x-freehand" , ".fhc":"image/x-freehand" , ".fif":"application/fractals" , ".flr":"x-world/x-vrml" , ".flv":"flv-application/octet-stream" , ".fm":"application/x-maker" , ".fpx":"image/x-fpx" , ".fvi":"video/isivideo" , ".gau":"chemical/x-gaussian-input" , ".gca":"application/x-gca-compressed" , ".gdb":"x-lml/x-gdb" , ".gif":"image/gif" , ".gps":"application/x-gps" , ".gtar":"application/x-gtar" , ".gz":"application/x-gzip" , ".h":"text/plain" , ".hdf":"application/x-hdf" , ".hdm":"text/x-hdml" , ".hdml":"text/x-hdml" , ".hlp":"application/winhlp" , ".hqx":"application/mac-binhex40" , ".hta":"application/hta" , ".htc":"text/x-component" , ".htm":"text/html" , ".html":"text/html" , ".hts":"text/html" , ".htt":"text/webviewhtml" , ".ice":"x-conference/x-cooltalk" , ".ico":"image/x-icon" , ".ief":"image/ief" , ".ifm":"image/gif" , ".ifs":"image/ifs" , ".iii":"application/x-iphone" , ".imy":"audio/melody" , ".ins":"application/x-internet-signup" , ".ips":"application/x-ipscript" , ".ipx":"application/x-ipix" , ".isp":"application/x-internet-signup" , ".it":"audio/x-mod" , ".itz":"audio/x-mod" , ".ivr":"i-world/i-vrml" , ".j2k":"image/j2k" , ".jad":"text/vnd.sun.j2me.app-descriptor" , ".jam":"application/x-jam" , ".jar":"application/java-archive" , ".java":"text/plain" , ".jfif":"image/pipeg" , ".jnlp":"application/x-java-jnlp-file" , ".jpe":"image/jpeg" , ".jpeg":"image/jpeg" , ".jpg":"image/jpeg" , ".jpz":"image/jpeg" , ".js":"application/x-javascript" , ".jwc":"application/jwc" , ".kjx":"application/x-kjx" , ".lak":"x-lml/x-lak" , ".latex":"application/x-latex" , ".lcc":"application/fastman" , ".lcl":"application/x-digitalloca" , ".lcr":"application/x-digitalloca" , ".lgh":"application/lgh" , ".lha":"application/octet-stream" , ".lml":"x-lml/x-lml" , ".lmlpack":"x-lml/x-lmlpack" , ".log":"text/plain" , ".lsf":"video/x-la-asf" , ".lsx":"video/x-la-asf" , ".lzh":"application/octet-stream" , ".m13":"application/x-msmediaview" , ".m14":"application/x-msmediaview" , ".m15":"audio/x-mod" , ".m3u":"audio/x-mpegurl" , ".m3url":"audio/x-mpegurl" , ".m4a":"audio/mp4a-latm" , ".m4b":"audio/mp4a-latm" , ".m4p":"audio/mp4a-latm" , ".m4u":"video/vnd.mpegurl" , ".m4v":"video/x-m4v" , ".ma1":"audio/ma1" , ".ma2":"audio/ma2" , ".ma3":"audio/ma3" , ".ma5":"audio/ma5" , ".man":"application/x-troff-man" , ".map":"magnus-internal/imagemap" , ".mbd":"application/mbedlet" , ".mct":"application/x-mascot" , ".mdb":"application/x-msaccess" , ".mdz":"audio/x-mod" , ".me":"application/x-troff-me" , ".mel":"text/x-vmel" , ".mht":"message/rfc822" , ".mhtml":"message/rfc822" , ".mi":"application/x-mif" , ".mid":"audio/mid" , ".midi":"audio/midi" , ".mif":"application/x-mif" , ".mil":"image/x-cals" , ".mio":"audio/x-mio" , ".mmf":"application/x-skt-lbs" , ".mng":"video/x-mng" , ".mny":"application/x-msmoney" , ".moc":"application/x-mocha" , ".mocha":"application/x-mocha" , ".mod":"audio/x-mod" , ".mof":"application/x-yumekara" , ".mol":"chemical/x-mdl-molfile" , ".mop":"chemical/x-mopac-input" , ".mov":"video/quicktime" , ".movie":"video/x-sgi-movie" , ".mp2":"video/mpeg" , ".mp3":"audio/mpeg" , ".mp4":"video/mp4" , ".mpa":"video/mpeg" , ".mpc":"application/vnd.mpohun.certificate" , ".mpe":"video/mpeg" , ".mpeg":"video/mpeg" , ".mpg":"video/mpeg" , ".mpg4":"video/mp4" , ".mpga":"audio/mpeg" , ".mpn":"application/vnd.mophun.application" , ".mpp":"application/vnd.ms-project" , ".mps":"application/x-mapserver" , ".mpv2":"video/mpeg" , ".mrl":"text/x-mrml" , ".mrm":"application/x-mrm" , ".ms":"application/x-troff-ms" , ".msg":"application/vnd.ms-outlook" , ".mts":"application/metastream" , ".mtx":"application/metastream" , ".mtz":"application/metastream" , ".mvb":"application/x-msmediaview" , ".mzv":"application/metastream" , ".nar":"application/zip" , ".nbmp":"image/nbmp" , ".nc":"application/x-netcdf" , ".ndb":"x-lml/x-ndb" , ".ndwn":"application/ndwn" , ".nif":"application/x-nif" , ".nmz":"application/x-scream" , ".nokia-op-logo":"image/vnd.nok-oplogo-color" , ".npx":"application/x-netfpx" , ".nsnd":"audio/nsnd" , ".nva":"application/x-neva1" , ".nws":"message/rfc822" , ".oda":"application/oda" , ".ogg":"audio/ogg" , ".oom":"application/x-AtlasMate-Plugin" , ".p10":"application/pkcs10" , ".p12":"application/x-pkcs12" , ".p7b":"application/x-pkcs7-certificates" , ".p7c":"application/x-pkcs7-mime" , ".p7m":"application/x-pkcs7-mime" , ".p7r":"application/x-pkcs7-certreqresp" , ".p7s":"application/x-pkcs7-signature" , ".pac":"audio/x-pac" , ".pae":"audio/x-epac" , ".pan":"application/x-pan" , ".pbm":"image/x-portable-bitmap" , ".pcx":"image/x-pcx" , ".pda":"image/x-pda" , ".pdb":"chemical/x-pdb" , ".pdf":"application/pdf" , ".pfr":"application/font-tdpfr" , ".pfx":"application/x-pkcs12" , ".pgm":"image/x-portable-graymap" , ".pict":"image/x-pict" , ".pko":"application/ynd.ms-pkipko" , ".pm":"application/x-perl" , ".pma":"application/x-perfmon" , ".pmc":"application/x-perfmon" , ".pmd":"application/x-pmd" , ".pml":"application/x-perfmon" , ".pmr":"application/x-perfmon" , ".pmw":"application/x-perfmon" , ".png":"image/png" , ".pnm":"image/x-portable-anymap" , ".pnz":"image/png" , ".pot,":"application/vnd.ms-powerpoint" , ".ppm":"image/x-portable-pixmap" , ".pps":"application/vnd.ms-powerpoint" , ".ppt":"application/vnd.ms-powerpoint" , ".pptx":"application/vnd.openxmlformats-officedocument.presentationml.presentation" , ".pqf":"application/x-cprplayer" , ".pqi":"application/cprplayer" , ".prc":"application/x-prc" , ".prf":"application/pics-rules" , ".prop":"text/plain" , ".proxy":"application/x-ns-proxy-autoconfig" , ".ps":"application/postscript" , ".ptlk":"application/listenup" , ".pub":"application/x-mspublisher" , ".pvx":"video/x-pv-pvx" , ".qcp":"audio/vnd.qcelp" , ".qt":"video/quicktime" , ".qti":"image/x-quicktime" , ".qtif":"image/x-quicktime" , ".r3t":"text/vnd.rn-realtext3d" , ".ra":"audio/x-pn-realaudio" , ".ram":"audio/x-pn-realaudio" , ".rar":"application/octet-stream" , ".ras":"image/x-cmu-raster" , ".rc":"text/plain" , ".rdf":"application/rdf+xml" , ".rf":"image/vnd.rn-realflash" , ".rgb":"image/x-rgb" , ".rlf":"application/x-richlink" , ".rm":"audio/x-pn-realaudio" , ".rmf":"audio/x-rmf" , ".rmi":"audio/mid" , ".rmm":"audio/x-pn-realaudio" , ".rmvb":"audio/x-pn-realaudio" , ".rnx":"application/vnd.rn-realplayer" , ".roff":"application/x-troff" , ".rp":"image/vnd.rn-realpix" , ".rpm":"audio/x-pn-realaudio-plugin" , ".rt":"text/vnd.rn-realtext" , ".rte":"x-lml/x-gps" , ".rtf":"application/rtf" , ".rtg":"application/metastream" , ".rtx":"text/richtext" , ".rv":"video/vnd.rn-realvideo" , ".rwc":"application/x-rogerwilco" , ".s3m":"audio/x-mod" , ".s3z":"audio/x-mod" , ".sca":"application/x-supercard" , ".scd":"application/x-msschedule" , ".sct":"text/scriptlet" , ".sdf":"application/e-score" , ".sea":"application/x-stuffit" , ".setpay":"application/set-payment-initiation" , ".setreg":"application/set-registration-initiation" , ".sgm":"text/x-sgml" , ".sgml":"text/x-sgml" , ".sh":"application/x-sh" , ".shar":"application/x-shar" , ".shtml":"magnus-internal/parsed-html" , ".shw":"application/presentations" , ".si6":"image/si6" , ".si7":"image/vnd.stiwap.sis" , ".si9":"image/vnd.lgtwap.sis" , ".sis":"application/vnd.symbian.install" , ".sit":"application/x-stuffit" , ".skd":"application/x-Koan" , ".skm":"application/x-Koan" , ".skp":"application/x-Koan" , ".skt":"application/x-Koan" , ".slc":"application/x-salsa" , ".smd":"audio/x-smd" , ".smi":"application/smil" , ".smil":"application/smil" , ".smp":"application/studiom" , ".smz":"audio/x-smd" , ".snd":"audio/basic" , ".spc":"application/x-pkcs7-certificates" , ".spl":"application/futuresplash" , ".spr":"application/x-sprite" , ".sprite":"application/x-sprite" , ".sdp":"application/sdp" , ".spt":"application/x-spt" , ".src":"application/x-wais-source" , ".sst":"application/vnd.ms-pkicertstore" , ".stk":"application/hyperstudio" , ".stl":"application/vnd.ms-pkistl" , ".stm":"text/html" , ".svg":"image/svg+xml" , ".sv4cpio":"application/x-sv4cpio" , ".sv4crc":"application/x-sv4crc" , ".svf":"image/vnd" , ".svg":"image/svg+xml" , ".svh":"image/svh" , ".svr":"x-world/x-svr" , ".swf":"application/x-shockwave-flash" , ".swfl":"application/x-shockwave-flash" , ".t":"application/x-troff" , ".tad":"application/octet-stream" , ".talk":"text/x-speech" , ".tar":"application/x-tar" , ".taz":"application/x-tar" , ".tbp":"application/x-timbuktu" , ".tbt":"application/x-timbuktu" , ".tcl":"application/x-tcl" , ".tex":"application/x-tex" , ".texi":"application/x-texinfo" , ".texinfo":"application/x-texinfo" , ".tgz":"application/x-compressed" , ".thm":"application/vnd.eri.thm" , ".tif":"image/tiff" , ".tiff":"image/tiff" , ".tki":"application/x-tkined" , ".tkined":"application/x-tkined" , ".toc":"application/toc" , ".toy":"image/toy" , ".tr":"application/x-troff" , ".trk":"x-lml/x-gps" , ".trm":"application/x-msterminal" , ".tsi":"audio/tsplayer" , ".tsp":"application/dsptype" , ".tsv":"text/tab-separated-values" , ".ttf":"application/octet-stream" , ".ttz":"application/t-time" , ".txt":"text/plain" , ".uls":"text/iuls" , ".ult":"audio/x-mod" , ".ustar":"application/x-ustar" , ".uu":"application/x-uuencode" , ".uue":"application/x-uuencode" , ".vcd":"application/x-cdlink" , ".vcf":"text/x-vcard" , ".vdo":"video/vdo" , ".vib":"audio/vib" , ".viv":"video/vivo" , ".vivo":"video/vivo" , ".vmd":"application/vocaltec-media-desc" , ".vmf":"application/vocaltec-media-file" , ".vmi":"application/x-dreamcast-vms-info" , ".vms":"application/x-dreamcast-vms" , ".vox":"audio/voxware" , ".vqe":"audio/x-twinvq-plugin" , ".vqf":"audio/x-twinvq" , ".vql":"audio/x-twinvq" , ".vre":"x-world/x-vream" , ".vrml":"x-world/x-vrml" , ".vrt":"x-world/x-vrt" , ".vrw":"x-world/x-vream" , ".vts":"workbook/formulaone" , ".wav":"audio/x-wav" , ".wax":"audio/x-ms-wax" , ".wbmp":"image/vnd.wap.wbmp" , ".wcm":"application/vnd.ms-works" , ".wdb":"application/vnd.ms-works" , ".web":"application/vnd.xara" , ".wi":"image/wavelet" , ".wis":"application/x-InstallShield" , ".wks":"application/vnd.ms-works" , ".wm":"video/x-ms-wm" , ".wma":"audio/x-ms-wma" , ".wmd":"application/x-ms-wmd" , ".wmf":"application/x-msmetafile" , ".wml":"text/vnd.wap.wml" , ".wmlc":"application/vnd.wap.wmlc" , ".wmls":"text/vnd.wap.wmlscript" , ".wmlsc":"application/vnd.wap.wmlscriptc" , ".wmlscript":"text/vnd.wap.wmlscript" , ".wmv":"audio/x-ms-wmv" , ".wmx":"video/x-ms-wmx" , ".wmz":"application/x-ms-wmz" , ".wpng":"image/x-up-wpng" , ".wps":"application/vnd.ms-works" , ".wpt":"x-lml/x-gps" , ".wri":"application/x-mswrite" , ".wrl":"x-world/x-vrml" , ".wrz":"x-world/x-vrml" , ".ws":"text/vnd.wap.wmlscript" , ".wsc":"application/vnd.wap.wmlscriptc" , ".wv":"video/wavelet" , ".wvx":"video/x-ms-wvx" , ".wxl":"application/x-wxl" , ".x-gzip":"application/x-gzip" , ".xaf":"x-world/x-vrml" , ".xar":"application/vnd.xara" , ".xbm":"image/x-xbitmap" , ".xdm":"application/x-xdma" , ".xdma":"application/x-xdma" , ".xdw":"application/vnd.fujixerox.docuworks" , ".xht":"application/xhtml+xml" , ".xhtm":"application/xhtml+xml" , ".xhtml":"application/xhtml+xml" , ".xla":"application/vnd.ms-excel" , ".xlc":"application/vnd.ms-excel" , ".xll":"application/x-excel" , ".xlm":"application/vnd.ms-excel" , ".xls":"application/vnd.ms-excel" , ".xlsx":"application/vnd.openxmlformats-officedocument.spreadsheetml.sheet" , ".xlt":"application/vnd.ms-excel" , ".xlw":"application/vnd.ms-excel" , ".xm":"audio/x-mod" , ".xml":"text/plain", ".xml":"application/xml", ".xmz":"audio/x-mod" , ".xof":"x-world/x-vrml" , ".xpi":"application/x-xpinstall" , ".xpm":"image/x-xpixmap" , ".xsit":"text/xml" , ".xsl":"text/xml" , ".xul":"text/xul" , ".xwd":"image/x-xwindowdump" , ".xyz":"chemical/x-pdb" , ".yz1":"application/x-yz1" , ".z":"application/x-compress" , ".zac":"application/x-zaurus-zac" , ".zip":"application/zip" , ".json":"application/json"}

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