测试http缓存如何才生效！ 原

const http = require('http');

const hostname = '127.0.0.1';
const port = 8000;

const server = http.createServer((req, res) => {
    if (req.headers['if-modified-since'] == 'abc') {
        res.statusCode = 304
        res.end();
    } else {
        res.statusCode = 200;
        res.setHeader("Last-Modified", "abc")
        res.setHeader('Content-Type', 'text/plain');
        res.end('Hello Worl\n');
    }
});

server.listen(port, hostname, () => {
    console.log(`服务器运行在 http://${hostname}:${port}/`);
});