(failed) http node.js server

gistfile1.js

var http = require( 'http' );
var url = require( 'url' );
var fs = require( 'fs' );
var path = require( 'path' );
var gzip = require( './lib/gzip' );

var VERBOSE = false;

var cache = {}, count = 0;

http.createServer( function ( request, response ) {

	VERBOSE && console.log( '<--', request.headers.host, request.url );

	// CACHE

	var uri = sites( request.headers.host, url.parse( request.url ).pathname );

	if ( cache[ uri ] ) {

		var cached = cache[ uri ];

		if ( cached.exists ) {

			if ( request.headers['if-modified-since'] ) {

				var mtime = new Date( request.headers['if-modified-since'] );

				if ( mtime >= cached.mtime ) {

					VERBOSE && console.log( '-->', 'CACHED', 304 );

					response.writeHead( 304 );
					response.end();

					return;

				}

			}

			fs.readFile( cached.filename, 'binary', function ( error, file ) {

				VERBOSE && console.log( '-->', 'CACHED', 200, cached.size );

				response.writeHead( 200, {
					'Content-Type': cached.mtype,
					'Content-Encoding': cached.gzip ? 'gzip' : 'identity',
					'Content-Length': cached.size,
					'Date': new Date().toString(),
					'Last-Modified': cached.mtime,
					'Keep-Alive': 'timeout=15, max=100'
				} );
				response.write( file, 'binary' );
				response.end();

			} );
 
		} else {

			VERBOSE && console.log( '-->', 'CACHED', 404 );

			response.writeHead( 404 );
			response.end();

		}

		return;

	}

	filename = uri;

	path.exists( filename, function ( exists ) {

		if ( !exists ) {

			cache[ uri ] = { 'exists': false };

			VERBOSE && console.log( '-->', 404 );

			response.writeHead( 404 );
			response.end();

			return;

		}

		fs.stat( filename, function ( error, stats ) {

			if ( stats.isDirectory() ) filename += '/index.html';

			fs.readFile( filename, 'binary', function ( error, file ) {

				if ( error ) {

					cache[ uri ] = { 'exists': false };

					VERBOSE && console.log( '-->', 404 );

					response.writeHead( 404 );
					response.end();

					return;

				}

				var ext = path.extname( filename ).toLowerCase();
				var mtype = mimetype( ext );
				var size = stats.size;
				var mtime = stats.mtime;

				if ( compressible( ext ) ) {

					gzip( file, function ( error, data ) {

						filename = '../tmp/' + ( count ++ );

						fs.writeFile( filename, data, function ( error ) {

							if ( error ) throw error;

							fs.stat( filename, function ( error, stats2 ) {

								cache[ uri ] = {

									'exists': true,
									'gzip': true,
									'filename': filename,
									'mtype': mtype,
									'size': stats2.size,
									'mtime': mtime

								};

								VERBOSE && console.log( '-->', 200, stats.size, stats2.size );

								response.writeHead( 200, {

									'Content-Type': mtype,
									'Content-Encoding': 'gzip',
									'Content-Length': stats2.size,
									'Date': new Date().toString(),
									'Last-Modified': mtime,
									'Keep-Alive': 'timeout=15, max=100'

								} );
								response.write( data, 'binary' );
								response.end();

							} );

						} );

					} );

				} else {

					cache[ uri ] = {

						'exists': true,
						'gzip': false,
						'filename': filename,
						'mtype': mtype,
						'size': size,
						'mtime': mtime

					};

					VERBOSE && console.log( '-->', 200, stats.size );

					response.writeHead( 200, {

						'Content-Type': mtype,
						'Content-Length': size,
						'Date': new Date().toString(),
						'Last-Modified': mtime,
						'Keep-Alive': 'timeout=15, max=100'

					} );
					response.write( file, 'binary' );
					response.end();

				}

			} );

		} );

	} );

} ).listen( 80 );

function sites( domain, uri ) {

	switch ( domain ) {

		case 'doobslice:1337':
		case 'mrdoob.com':
		case 'www.mrdoob.com':

			if ( uri.substr( -1 ) == '/' ) uri += 'index.html';
			if ( /^\/(\d+)\//.test( uri ) ) uri = '/index.html'; // showcase
			return path.join( '../www/mrdoob.com', uri );

		case '60fps.com':
		case 'www.60fps.com':

			if ( uri.substr( -1 ) == '/' ) uri += 'index.html';
			return path.join( '../www/60fps.com', uri );

		case 'xplsv.tv':
		case 'www.xplsv.tv':

			if ( uri.substr( -1 ) == '/' ) uri += 'index.html';
			return path.join( '../www/xplsv.tv', uri );

		default:

			return '';

	}

}

function mimetype( extension ) {

	switch ( extension ) {

		case '.ico': return 'image/x-icon';
		case '.html': case '.htm': return 'text/html';
		case '.css': return 'text/css';
		case '.js': return 'text/javascript';
		case '.json': return 'text/json';
		case '.png': return 'image/png';
		case '.jpeg': case '.jpg': case '.jpe': return 'image/jpeg';
		case '.oga': case '.ogg': case '.spx': return 'audio/ogg';
		case '.mpga': case '.mp2': case '.mp2a': case '.mp3': case '.m2a': case '.m3a': return 'audio/mpeg';
		default: return 'text/plain';

	}

}

function compressible( extension ) {

	switch ( extension ) {

		case '.html': case '.htm': case '.css': case '.js': case '.json': return true;
		default: return false;

	}

}

VERBOSE && console.log( 'Server running.' );