随笔 - 326, 文章 - 0, 评论 - 0, 阅读 - 16万

web页面如下

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <ul>
        <li>1</li>
        <li>2</li>
        <li>3</li>
        <li>4</li>
        <li>5</li>
        ... 省略
        <li>9991</li>
        <li>10001</li>
    </ul>
</body>
</html>

服务器代码如下

const express = require("express");
const app = express();
const path = require("path");
const fs = require("fs");
const zlib = require("zlib");


app.get("/", (req, res) => {
    const filePath = path.resolve(__dirname, "./index.html");
    const rs = fs.createReadStream(filePath);

    //获取请求中的Accept-Encoding可以接受的类型，根据可以接受的类型来完成压缩选择
    console.log(req.headers["accept-encoding"]);
    const acceptEncoding = req.headers["accept-encoding"];
    //可以使用includes判断字符串中是否含有某个值
    if (acceptEncoding.includes("gzip")) {
        const zlibFile = rs.pipe(zlib.createGzip())
        res.set("Content-Encoding", "gzip")
        return zlibFile.pipe(res);
    }

    if (acceptEncoding.includes("deflate")) {
        const zlibFile = rs.pipe(zlib.createDeflate())
        res.set("Content-Encoding", "deflate")
        return zlibFile.pipe(res);
    }

    if (acceptEncoding.includes("br")) {
        const zlibFile = rs.pipe(zlib.createBrotliCompress())
        res.set("Content-Encoding", "br")
        return zlibFile.pipe(res);
    }

    //如果上边的条件都不符合，则不压缩 直接响应
    rs.pipe(res);

    //使用gZip压缩:创建一个新的gzip对象，并把文件写入这个对象中
    /* const zlibFile = rs.pipe(zlib.createGzip())
    res.set("Content-Encoding", "gzip") */

    /* const zlibFile = rs.pipe(zlib.createBrotliCompress())
    res.set("Content-Encoding", "br") */

    /* const zlibFile = rs.pipe(zlib.createDeflate())
    res.set("Content-Encoding", "deflate") */

    // zlibFile.pipe(res);
})

app.listen("3000", (err) => {
    if (err) {
        console.log(err);
        return;
    }
    console.log("http://127.0.0.1:3000");
})