browser cache test

cacheTest

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

var transferFile = function (request, response) {
    var uri = url.parse(request.url).pathname;
    var filepath = path.join(process.cwd(), uri);

    path.exists(filepath, function (exists) {
        if (!exists) {
            response.writeHead(404, {"Content-Type": "text/plain"});
            response.write("404 Not Found\n");
            response.end();
        } else {
            fs.readFile(filepath, "binary", function (error, data) {
                if (error) {
                    response.writeHead(500, {
                        "Content-Type": "text/plain"

                    });
                    response.write(error + "\n");
                } else {

                    console.log( 'request: ' + uri, Date.now() );

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

                        console.log( 304 );
                        response.writeHead( 304 );
                    }
                    else {

                        // 设置max-age为10s，在10s内 只要不进行强制刷新，那么浏览器都将直接使用本地缓存
                        // 过了10s，对与该资源的请求将重新向服务器获取
                        response.writeHead(200, {
                            "Cache-Control": "max-age=10",
                            "Last-Modified": (new Date).toString()
                        });

                        response.write(data, "binary");
                    }
                }

                response.end();
            });
        }
    });
}

http.createServer(function(request, response) {
    transferFile(request, response);
}).listen(8124, "127.0.0.1");

在同目录下创建index.html，并虽然写一个简单的index.css文件，在index.html中引入index.css文件，测试浏览器的缓存机制