Simple HTTP Server in deno (WIP), this is just a toy code, DO NOT USE THIS.

index.ts

/**
 * Simple HTTP Server
 */

import { serve } from "https://deno.land/x/net/http.ts";
import * as deno from "deno";
import { mime } from "./mime";

const addr = "0.0.0.0:8000";
const s = serve(addr);
console.log(`listening on http://${addr}/`);

function urlToPath(url: string): string {
  let pathName = url.replace(/\\/g, "/");
  if (pathName.charAt(0) === "/") {
    pathName = pathName.substr(1);
  }
  if (pathName === "") {
    pathName = "index.html";
  }
  return pathName;
}

function getMime(ext) {
  for (let k of Object.keys(mime)) {
    if (mime[k].indexOf(ext) > -1) {
      return k;
    }
  }
  return "";
}

async function main() {
  for await (const req of s) {
    let pathName = urlToPath(req.url);
    try {
      let stat = deno.statSync(pathName);
      if (stat.isFile()) {
        const body = await deno.readFile(pathName);
        const headers = new Headers();
        const sep = pathName.split(".");
        const ext = sep[sep.length - 1];
        headers.append("Content-Type", getMime(ext));
        await req.respond({ status: 200, body, headers });
      } else {
        await req.respond({
          status: 404,
          body: new TextEncoder().encode("Not Found")
        });
      }
    } catch (e) {
      await req.respond({
        status: 404,
        body: new TextEncoder().encode("Not Found")
      });
    }
  }
}

main();

mime.ts

// taken from https://unpkg.com/mime@2.4.0/types/standard.json

export const mime = {
  "application/andrew-inset": ["ez"],
  "application/applixware": ["aw"],
  "application/atom+xml": ["atom"],
  "application/atomcat+xml": ["atomcat"],
  "application/atomsvc+xml": ["atomsvc"],
  "application/bdoc": ["bdoc"],
  "application/ccxml+xml": ["ccxml"],
  "application/cdmi-capability": ["cdmia"],
  "application/cdmi-container": ["cdmic"],
  "application/cdmi-domain": ["cdmid"],
  "application/cdmi-object": ["cdmio"],
  "application/cdmi-queue": ["cdmiq"],
  "application/cu-seeme": ["cu"],
  "application/dash+xml": ["mpd"],
  "application/davmount+xml": ["davmount"],
  "application/docbook+xml": ["dbk"],
  "application/dssc+der": ["dssc"],
  "application/dssc+xml": ["xdssc"],
  "application/ecmascript": ["ecma", "es"],
  "application/emma+xml": ["emma"],
  "application/epub+zip": ["epub"],
  "application/exi": ["exi"],
  "application/font-tdpfr": ["pfr"],
  "application/geo+json": ["geojson"],
  "application/gml+xml": ["gml"],
  "application/gpx+xml": ["gpx"],
  "application/gxf": ["gxf"],
  "application/gzip": ["gz"],
  "application/hjson": ["hjson"],
  "application/hyperstudio": ["stk"],
  "application/inkml+xml": ["ink", "inkml"],
  "application/ipfix": ["ipfix"],
  "application/java-archive": ["jar", "war", "ear"],
  "application/java-serialized-object": ["ser"],
  "application/java-vm": ["class"],
  "application/javascript": ["js", "mjs"],
  "application/json": ["json", "map"],
  "application/json5": ["json5"],
  "application/jsonml+json": ["jsonml"],
  "application/ld+json": ["jsonld"],
  "application/lost+xml": ["lostxml"],
  "application/mac-binhex40": ["hqx"],
  "application/mac-compactpro": ["cpt"],
  "application/mads+xml": ["mads"],
  "application/manifest+json": ["webmanifest"],
  "application/marc": ["mrc"],
  "application/marcxml+xml": ["mrcx"],
  "application/mathematica": ["ma", "nb", "mb"],
  "application/mathml+xml": ["mathml"],
  "application/mbox": ["mbox"],
  "application/mediaservercontrol+xml": ["mscml"],
  "application/metalink+xml": ["metalink"],
  "application/metalink4+xml": ["meta4"],
  "application/mets+xml": ["mets"],
  "application/mods+xml": ["mods"],
  "application/mp21": ["m21", "mp21"],
  "application/mp4": ["mp4s", "m4p"],
  "application/msword": ["doc", "dot"],
  "application/mxf": ["mxf"],
  "application/octet-stream": [
    "bin",
    "dms",
    "lrf",
    "mar",
    "so",
    "dist",
    "distz",
    "pkg",
    "bpk",
    "dump",
    "elc",
    "deploy",
    "exe",
    "dll",
    "deb",
    "dmg",
    "iso",
    "img",
    "msi",
    "msp",
    "msm",
    "buffer"
  ],
  "application/oda": ["oda"],
  "application/oebps-package+xml": ["opf"],
  "application/ogg": ["ogx"],
  "application/omdoc+xml": ["omdoc"],
  "application/onenote": ["onetoc", "onetoc2", "onetmp", "onepkg"],
  "application/oxps": ["oxps"],
  "application/patch-ops-error+xml": ["xer"],
  "application/pdf": ["pdf"],
  "application/pgp-encrypted": ["pgp"],
  "application/pgp-signature": ["asc", "sig"],
  "application/pics-rules": ["prf"],
  "application/pkcs10": ["p10"],
  "application/pkcs7-mime": ["p7m", "p7c"],
  "application/pkcs7-signature": ["p7s"],
  "application/pkcs8": ["p8"],
  "application/pkix-attr-cert": ["ac"],
  "application/pkix-cert": ["cer"],
  "application/pkix-crl": ["crl"],
  "application/pkix-pkipath": ["pkipath"],
  "application/pkixcmp": ["pki"],
  "application/pls+xml": ["pls"],
  "application/postscript": ["ai", "eps", "ps"],
  "application/pskc+xml": ["pskcxml"],
  "application/raml+yaml": ["raml"],
  "application/rdf+xml": ["rdf", "owl"],
  "application/reginfo+xml": ["rif"],
  "application/relax-ng-compact-syntax": ["rnc"],
  "application/resource-lists+xml": ["rl"],
  "application/resource-lists-diff+xml": ["rld"],
  "application/rls-services+xml": ["rs"],
  "application/rpki-ghostbusters": ["gbr"],
  "application/rpki-manifest": ["mft"],
  "application/rpki-roa": ["roa"],
  "application/rsd+xml": ["rsd"],
  "application/rss+xml": ["rss"],
  "application/rtf": ["rtf"],
  "application/sbml+xml": ["sbml"],
  "application/scvp-cv-request": ["scq"],
  "application/scvp-cv-response": ["scs"],
  "application/scvp-vp-request": ["spq"],
  "application/scvp-vp-response": ["spp"],
  "application/sdp": ["sdp"],
  "application/set-payment-initiation": ["setpay"],
  "application/set-registration-initiation": ["setreg"],
  "application/shf+xml": ["shf"],
  "application/smil+xml": ["smi", "smil"],
  "application/sparql-query": ["rq"],
  "application/sparql-results+xml": ["srx"],
  "application/srgs": ["gram"],
  "application/srgs+xml": ["grxml"],
  "application/sru+xml": ["sru"],
  "application/ssdl+xml": ["ssdl"],
  "application/ssml+xml": ["ssml"],
  "application/tei+xml": ["tei", "teicorpus"],
  "application/thraud+xml": ["tfi"],
  "application/timestamped-data": ["tsd"],
  "application/voicexml+xml": ["vxml"],
  "application/wasm": ["wasm"],
  "application/widget": ["wgt"],
  "application/winhlp": ["hlp"],
  "application/wsdl+xml": ["wsdl"],
  "application/wspolicy+xml": ["wspolicy"],
  "application/xaml+xml": ["xaml"],
  "application/xcap-diff+xml": ["xdf"],
  "application/xenc+xml": ["xenc"],
  "application/xhtml+xml": ["xhtml", "xht"],
  "application/xml": ["xml", "xsl", "xsd", "rng"],
  "application/xml-dtd": ["dtd"],
  "application/xop+xml": ["xop"],
  "application/xproc+xml": ["xpl"],
  "application/xslt+xml": ["xslt"],
  "application/xspf+xml": ["xspf"],
  "application/xv+xml": ["mxml", "xhvml", "xvml", "xvm"],
  "application/yang": ["yang"],
  "application/yin+xml": ["yin"],
  "application/zip": ["zip"],
  "audio/3gpp": ["*3gpp"],
  "audio/adpcm": ["adp"],
  "audio/basic": ["au", "snd"],
  "audio/midi": ["mid", "midi", "kar", "rmi"],
  "audio/mp3": ["*mp3"],
  "audio/mp4": ["m4a", "mp4a"],
  "audio/mpeg": ["mpga", "mp2", "mp2a", "mp3", "m2a", "m3a"],
  "audio/ogg": ["oga", "ogg", "spx"],
  "audio/s3m": ["s3m"],
  "audio/silk": ["sil"],
  "audio/wav": ["wav"],
  "audio/wave": ["*wav"],
  "audio/webm": ["weba"],
  "audio/xm": ["xm"],
  "font/collection": ["ttc"],
  "font/otf": ["otf"],
  "font/ttf": ["ttf"],
  "font/woff": ["woff"],
  "font/woff2": ["woff2"],
  "image/aces": ["exr"],
  "image/apng": ["apng"],
  "image/bmp": ["bmp"],
  "image/cgm": ["cgm"],
  "image/dicom-rle": ["drle"],
  "image/emf": ["emf"],
  "image/fits": ["fits"],
  "image/g3fax": ["g3"],
  "image/gif": ["gif"],
  "image/heic": ["heic"],
  "image/heic-sequence": ["heics"],
  "image/heif": ["heif"],
  "image/heif-sequence": ["heifs"],
  "image/ief": ["ief"],
  "image/jls": ["jls"],
  "image/jp2": ["jp2", "jpg2"],
  "image/jpeg": ["jpeg", "jpg", "jpe"],
  "image/jpm": ["jpm"],
  "image/jpx": ["jpx", "jpf"],
  "image/ktx": ["ktx"],
  "image/png": ["png"],
  "image/sgi": ["sgi"],
  "image/svg+xml": ["svg", "svgz"],
  "image/t38": ["t38"],
  "image/tiff": ["tif", "tiff"],
  "image/tiff-fx": ["tfx"],
  "image/webp": ["webp"],
  "image/wmf": ["wmf"],
  "message/disposition-notification": ["disposition-notification"],
  "message/global": ["u8msg"],
  "message/global-delivery-status": ["u8dsn"],
  "message/global-disposition-notification": ["u8mdn"],
  "message/global-headers": ["u8hdr"],
  "message/rfc822": ["eml", "mime"],
  "model/gltf+json": ["gltf"],
  "model/gltf-binary": ["glb"],
  "model/iges": ["igs", "iges"],
  "model/mesh": ["msh", "mesh", "silo"],
  "model/vrml": ["wrl", "vrml"],
  "model/x3d+binary": ["x3db", "x3dbz"],
  "model/x3d+vrml": ["x3dv", "x3dvz"],
  "model/x3d+xml": ["x3d", "x3dz"],
  "text/cache-manifest": ["appcache", "manifest"],
  "text/calendar": ["ics", "ifb"],
  "text/coffeescript": ["coffee", "litcoffee"],
  "text/css": ["css"],
  "text/csv": ["csv"],
  "text/html": ["html", "htm", "shtml"],
  "text/jade": ["jade"],
  "text/jsx": ["jsx"],
  "text/less": ["less"],
  "text/markdown": ["markdown", "md"],
  "text/mathml": ["mml"],
  "text/n3": ["n3"],
  "text/plain": ["txt", "text", "conf", "def", "list", "log", "in", "ini"],
  "text/richtext": ["rtx"],
  "text/rtf": ["*rtf"],
  "text/sgml": ["sgml", "sgm"],
  "text/shex": ["shex"],
  "text/slim": ["slim", "slm"],
  "text/stylus": ["stylus", "styl"],
  "text/tab-separated-values": ["tsv"],
  "text/troff": ["t", "tr", "roff", "man", "me", "ms"],
  "text/turtle": ["ttl"],
  "text/uri-list": ["uri", "uris", "urls"],
  "text/vcard": ["vcard"],
  "text/vtt": ["vtt"],
  "text/xml": ["*xml"],
  "text/yaml": ["yaml", "yml"],
  "video/3gpp": ["3gp", "3gpp"],
  "video/3gpp2": ["3g2"],
  "video/h261": ["h261"],
  "video/h263": ["h263"],
  "video/h264": ["h264"],
  "video/jpeg": ["jpgv"],
  "video/jpm": ["*jpm", "jpgm"],
  "video/mj2": ["mj2", "mjp2"],
  "video/mp2t": ["ts"],
  "video/mp4": ["mp4", "mp4v", "mpg4"],
  "video/mpeg": ["mpeg", "mpg", "mpe", "m1v", "m2v"],
  "video/ogg": ["ogv"],
  "video/quicktime": ["qt", "mov"],
  "video/webm": ["webm"]
};