A simple server using Node.js

server.js

const http = require("http");
const path = require("path");
const url = require("url");
const fs = require("fs");

const config = {
	app: {
		http: {
			port: 80,
			host: "0.0.0.0"
		}
	}
}

const server = http.createServer((req, res) => {
	const parsedUrl = url.parse(req.url, true);
	const filename = path.join(__dirname, parsedUrl.filename);
	const exists = fs.existsSync(filename);
	try {
		if (exists) {
			const data = fs.readFileSync(filename);
			const extension = path.extname(filename);
			const mimeType = (function (extension) {
				/** @type {{ [extension: string]: string }} */
				const mimeTypes = {
					"3gp": "video/3gpp",
					"a": "application/octet-stream",
					"ai": "application/postscript",
					"aif": "audio/x-aiff",
					"aiff": "audio/x-aiff",
					"asc": "application/pgp-signature",
					"asf": "video/x-ms-asf",
					"asm": "text/x-asm",
					"asx": "video/x-ms-asf",
					"atom": "application/atom+xml",
					"au": "audio/basic",
					"avi": "video/x-msvideo",
					"bat": "application/x-msdownload",
					"bin": "application/octet-stream",
					"bmp": "image/bmp",
					"bz2": "application/x-bzip2",
					"c": "text/x-c",
					"cab": "application/vnd.ms-cab-compressed",
					"cc": "text/x-c",
					"chm": "application/vnd.ms-htmlhelp",
					"class": "application/octet-stream",
					"com": "application/x-msdownload",
					"conf": "text/plain",
					"cpp": "text/x-c",
					"crt": "application/x-x509-ca-cert",
					"css": "text/css",
					"csv": "text/csv",
					"cxx": "text/x-c",
					"deb": "application/x-debian-package",
					"der": "application/x-x509-ca-cert",
					"diff": "text/x-diff",
					"djv": "image/vnd.djvu",
					"djvu": "image/vnd.djvu",
					"dll": "application/x-msdownload",
					"dmg": "application/octet-stream",
					"doc": "application/msword",
					"dot": "application/msword",
					"dtd": "application/xml-dtd",
					"dvi": "application/x-dvi",
					"ear": "application/java-archive",
					"eml": "message/rfc822",
					"eps": "application/postscript",
					"exe": "application/x-msdownload",
					"f": "text/x-fortran",
					"f77": "text/x-fortran",
					"f90": "text/x-fortran",
					"flv": "video/x-flv",
					"for": "text/x-fortran",
					"gem": "application/octet-stream",
					"gemspec": "text/x-script.ruby",
					"gif": "image/gif",
					"gz": "application/x-gzip",
					"h": "text/x-c",
					"hh": "text/x-c",
					"htm": "text/html",
					"html": "text/html",
					"ico": "image/vnd.microsoft.icon",
					"ics": "text/calendar",
					"ifb": "text/calendar",
					"iso": "application/octet-stream",
					"jar": "application/java-archive",
					"java": "text/x-java-source",
					"jnlp": "application/x-java-jnlp-file",
					"jpeg": "image/jpeg",
					"jpg": "image/jpeg",
					"js": "application/javascript",
					"json": "application/json",
					"log": "text/plain",
					"m3u": "audio/x-mpegurl",
					"m4v": "video/mp4",
					"man": "text/troff",
					"mathml": "application/mathml+xml",
					"mbox": "application/mbox",
					"mdoc": "text/troff",
					"me": "text/troff",
					"mid": "audio/midi",
					"midi": "audio/midi",
					"mime": "message/rfc822",
					"mml": "application/mathml+xml",
					"mng": "video/x-mng",
					"mov": "video/quicktime",
					"mp3": "audio/mpeg",
					"mp4": "video/mp4",
					"mp4v": "video/mp4",
					"mpeg": "video/mpeg",
					"mpg": "video/mpeg",
					"ms": "text/troff",
					"msi": "application/x-msdownload",
					"odp": "application/vnd.oasis.opendocument.presentation",
					"ods": "application/vnd.oasis.opendocument.spreadsheet",
					"odt": "application/vnd.oasis.opendocument.text",
					"ogg": "application/ogg",
					"p": "text/x-pascal",
					"pas": "text/x-pascal",
					"pbm": "image/x-portable-bitmap",
					"pdf": "application/pdf",
					"pem": "application/x-x509-ca-cert",
					"pgm": "image/x-portable-graymap",
					"pgp": "application/pgp-encrypted",
					"pkg": "application/octet-stream",
					"pl": "text/x-script.perl",
					"pm": "text/x-script.perl-module",
					"png": "image/png",
					"pnm": "image/x-portable-anymap",
					"ppm": "image/x-portable-pixmap",
					"pps": "application/vnd.ms-powerpoint",
					"ppt": "application/vnd.ms-powerpoint",
					"ps": "application/postscript",
					"psd": "image/vnd.adobe.photoshop",
					"py": "text/x-script.python",
					"qt": "video/quicktime",
					"ra": "audio/x-pn-realaudio",
					"rake": "text/x-script.ruby",
					"ram": "audio/x-pn-realaudio",
					"rar": "application/x-rar-compressed",
					"rb": "text/x-script.ruby",
					"rdf": "application/rdf+xml",
					"roff": "text/troff",
					"rpm": "application/x-redhat-package-manager",
					"rss": "application/rss+xml",
					"rtf": "application/rtf",
					"ru": "text/x-script.ruby",
					"s": "text/x-asm",
					"sgm": "text/sgml",
					"sgml": "text/sgml",
					"sh": "application/x-sh",
					"sig": "application/pgp-signature",
					"snd": "audio/basic",
					"so": "application/octet-stream",
					"svg": "image/svg+xml",
					"svgz": "image/svg+xml",
					"swf": "application/x-shockwave-flash",
					"t": "text/troff",
					"tar": "application/x-tar",
					"tbz": "application/x-bzip-compressed-tar",
					"tcl": "application/x-tcl",
					"tex": "application/x-tex",
					"texi": "application/x-texinfo",
					"texinfo": "application/x-texinfo",
					"text": "text/plain",
					"tif": "image/tiff",
					"tiff": "image/tiff",
					"torrent": "application/x-bittorrent",
					"tr": "text/troff",
					"txt": "text/plain",
					"vcf": "text/x-vcard",
					"vcs": "text/x-vcalendar",
					"vrml": "model/vrml",
					"war": "application/java-archive",
					"wav": "audio/x-wav",
					"wma": "audio/x-ms-wma",
					"wmv": "video/x-ms-wmv",
					"wmx": "video/x-ms-wmx",
					"wrl": "model/vrml",
					"wsdl": "application/wsdl+xml",
					"xbm": "image/x-xbitmap",
					"xhtml": "application/xhtml+xml",
					"xls": "application/vnd.ms-excel",
					"xml": "application/xml",
					"xpm": "image/x-xpixmap",
					"xsl": "application/xml",
					"xslt": "application/xslt+xml",
					"yaml": "text/yaml",
					"yml": "text/yaml",
					"zip": "application/zip"
				}

				return mimeTypes[extension]
					|| "application/octet-stream";
			})(extension);

			res.statusCode = 200;
			res.statusMessage = "200 OK";
			res.setHeader("Content-Type", mimeType);
			res.write(data);
		} else {
			const message = `Cannot ${req.method} ${parsedUrl.filename}`;
			res.statusCode = 404;
			res.statusMessage = "404 Not Found";
			res.setHeader("Content-Type", "text/plain");
			res.write(message);
		}
	} catch (error) {
		const message = "Internal Server Error";
		res.statusCode = 500;
		res.statusMessage = message;
		res.setHeader("Content-Type", "text/plain");
		res.write(message);
	} finally {
		res.end();
	}
});

server.on("listening", () => {
	const { host, port } = config.app.http;
	console.log(`App listening at ${host}:${port}`);
});

server.listen(config.app.http);