Node.js静态文件服务器改进版

var PORT = 8000;var http = require("http");var url = require("url");var fs = require("fs");var path = require("path");var mime = require("./mime").types;var config = require("./config");var zlib = require("zlib");var server = http.createServer(function(request, response) { response.setHeader("Server", "Node/V5"); var pathname = url.parse(request.url).pathname; console.log("url = " + pathname); if (pathname.slice(-1) === "/") {  pathname = pathname + config.Welcome.file; } var realPath = __dirname + "/" + path.join("assets", path.normalize(pathname.replace(//././g, ""))); console.log("realPath = " + realPath); var pathHandle = function (realPath) {  fs.stat(realPath, function (err, stats) {   if (err) {    response.writeHead(404, "Not Found", {'Content-Type': 'text/plain'});    response.write("stats = " + stats);    response.write("This request URL " + pathname + " was not found on this server.");    response.end();   } else {    if (stats.isDirectory()) {     realPath = path.join(realPath, "/", config.Welcome.file);     pathHandle(realPath);    } else {     var ext = path.extname(realPath);     ext = ext ? ext.slice(1) : 'unknown';     var contentType = mime[ext] || "text/plain";     response.setHeader("Content-Type", contentType);     //获得文件的修改时间      var lastModified = stats.mtime.toUTCString();     var ifModifiedSince = "If-Modified-Since".toLowerCase();     //设置Last-Modified     //服务器给浏览器返回文件最后一次修改时间Last-Modified     response.setHeader("Last-Modified", lastModified);     if (ext.match(config.Expires.fileMatch)) {      var expires = new Date();      expires.setTime(expires.getTime() + config.Expires.maxAge * 1000);      response.setHeader("Expires", expires.toUTCString());      response.setHeader("Cache-Control", "max-age=" + config.Expires.maxAge);     }     //服务器接收浏览器发送过来的If-Modified-Since报文头     //日期相同表示该资源没有变化则返回304     //告诉浏览器该资源你已经有了,不需要再请求了     if (request.headers[ifModifiedSince] && lastModified == request.headers[ifModifiedSince]) {      response.writeHead(304, "Not Modified");      response.end();     } else {      var raw = fs.createReadStream(realPath);      var acceptEncoding = request.headers['accept-encoding'] || "";      var matched = ext.match(config.Compress.match);       if (matched && acceptEncoding.match(//bgzip/b/)) {       response.writeHead(200, "Ok", {'Content-Encoding': 'gzip'});       raw.pipe(zlib.createGzip()).pipe(response);      } else if (matched && acceptEncoding.match(//bdeflate/b/)) {       response.writeHead(200, "Ok", {'Content-Encoding': 'deflate'});       raw.pipe(zlib.createDeflate()).pipe(response);      } else {       response.writeHead(200, "Ok");       raw.pipe(response);      }     }    }   }  }); }; pathHandle(realPath);});server.listen(PORT);console.log("Server runing at port: " + PORT + ".");

exports.Expires = { fileMatch: /^(gif|png|jpg|js|css)$/ig, maxAge: 60*60*24*365};exports.Compress = { match: /css|js|html/ig};exports.Welcome = { file: "index.html"};

exports.types = { "css": "text/css", "gif": "image/gif", "html": "text/html", "ico": "image/x-icon", "jpeg": "image/jpeg", "jpg": "image/jpeg", "js": "text/javascript", "json": "application/json", "pdf": "application/pdf", "png": "image/png", "svg": "image/svg+xml", "swf": "application/x-shockwave-flash", "tiff": "image/tiff", "txt": "text/plain", "wav": "audio/x-wav", "wma": "audio/x-ms-wma", "wmv": "video/x-ms-wmv", "xml": "text/xml"};