text## 1. 静态资源服务器命令行工具
response.setHeader('Accept-Ranges', 'bytes')
Range: bytes=0-xxx
来判断是否是做Range请求,如果这个值存在而且有效,则只发回请求的那部分文件内容,响应的状态码变成206,如果无效,则返回416状态码,表明Request Range Not Satisfiablecurl -r 0-1024 -o music.mp3
可以通过Accept-Language检测浏览器的语言
let http = require('http');
let pack = {
en: {
title: 'hello'
},
cn: {
title: '欢迎'
}
}
function request(req, res) {
let acceptLangulage = req.headers['accept-language'];
let lan = 'en';
if (acceptLangulage) {
lan = acceptLangulage.split(',').map(item => {
let values = item.split(';');
return {
name: values[0].split('-')[0],
q: isNaN(values[1]) ? 1 : parseInt(values[1])
}
}).sort((lan1, lan2) => lan1.q - lan2.q).shift().name;
}
res.end(pack[lan] ? pack[lan].title : pack['en'].title);
}
let server = http.createServer();
server.on('request', request);
server.listen(8080);
let http = require('http');
let url = require('url');
let path = require('path');
let fs = require('fs');
let root = path.join(__dirname, 'public');
function removePort(host) {
return host.split(':')[0]
}
function getHostName(urlAddr) {
let {
host
} = url.parse(urlAddr);
return removePort(host);
}
function request(req, res) {
let refer = req.headers['referer'] || req.headers['referrer'];
if (refer) {
let referHost = getHostName(refer);
let host = removePort(req.headers['host']);
if (referHost != host) {
sendForbidden(req, res);
} else {
serve(req, res);
}
} else {
serve(req, res);
}
}
function serve(req, res) {
let {
pathname
} = url.parse(req.url);
let filepath = path.join(root, pathname);
console.log(req.url, filepath);
fs.stat(filepath, (err, stat) => {
if (err) {
res.end('Not Found');
} else {
fs.createReadStream(filepath).pipe(res);
}
});
}
function sendForbidden(req, res) {
res.end('防盗链');
}
let server = http.createServer();
server.on('request', request);
server.listen(8080);
//-H "referer: http://xxx.xxx.xxx.xxx" http://localhost:8080/mv.jpg
代理(英语:Proxy),也称网络代理,是一种特殊的网络服务,允许一个网络终端(一般为客户端)通过这个服务与另一个网络终端(一般为服务器)进行非直接的连接。一些网关、路由器等网络设备具备网络代理功能。一般认为代理服务有利于保障网络终端的隐私或安全,防止攻击。
npm install http-proxy --save
https://www.npmjs.com/package/http-proxy
let httpProxy = require('http-proxy');
let http = require('http');
let proxy = httpProxy.createProxyServer();
http.createServer(function (req, res) {
proxy.web(req, res, {
target: 'http://localhost:8000'
});
proxy.on('error', function (err) {
console.log('出错了');
res.end(err.toString());
});
}).listen(8080);
通过Host实现多个网站共用一个端口,多个网站共用一个服务器
let http = require('http');
let httpProxy = require('http-proxy');
let proxy = httpProxy.createProxyServer();
let hosts = {
'a.zfpx.cn': 'http://localhost:8000',
'b.zfpx.cn': 'http://localhost:9000'
}
let server = http.createServer(function (req, res) {
let host = req.headers['host'];
host = host.split(':')[0];
let target = hosts[host];
proxy.web(req, res, {
target
});
}).listen(80);
User Agent中文名为用户代理,简称 UA,它是一个特殊字符串头,使得服务器能够识别客户使用的操作系统及版本、CPU 类型、浏览器及版本、浏览器渲染引擎、浏览器语言、浏览器插件等。
user-agent-parser