Node.js http2.getUnpackedSettings() 方法

http2.getUnpackedSettings()是 http2 模块内的 http2 类的内置应用程序编程接口，用于提供 HTTP/2 设置对象，其中包含由 http2.getPackedSettings() 生成的给定缓冲区的反序列化设置。

句法：

const http2.getUnpackedSettings(buf)

参数：此函数将 http2 设置作为参数。

返回值：此函数返回一个 HTTP/2 设置对象，其中包含来自给定缓冲区的反序列化设置，由 http2.getPackedSettings() 生成。

如何生成私钥和公共证书？

1.文件名：私钥打开记事本并复制粘贴以下密钥并将文件保存为private-key.pem

-----BEGIN RSA PRIVATE KEY-----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-----END RSA PRIVATE KEY-----

2.文件名：公共证书打开记事本并复制粘贴以下密钥并将文件保存为public-cert.pem

-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

示例 1：文件名：index.js

Javascript

// Node.js program to demonstrate the
// http2.getPackedSettings() method
  
const http2 = require('http2');
const fs = require('fs');
  
// Private key and public certificate 
// for access
const options = {
    key: fs.readFileSync('private-key.pem'),
    cert: fs.readFileSync('public-cert.pem'),
};
  
// Creating and initializing server
// by using http2.createServer() method
const server = http2.createServer(options);
  
// Getting packed setting by using
// getPackedSettings() method
const value = http2.getPackedSettings(
        { maxFrameSize: 163955 })
  
const unpacked = http2.getUnpackedSettings(value);
  
console.log("max frame size :- " 
    + unpacked.maxFrameSize);
  
server.on('stream', (stream, requestHeaders) => {
    stream.respond({
        ':status': 200, 'content-type':
            'text/plain'
    });
    stream.write('hello ');
    stream.end('world');
  
    // Stopping the server
    // by using the close() method
    server.close(() => {
        console.log("server closed");
    })
});
  
server.listen(8000);
  
// Creating and initializing client
// by using tls.connect() method
const client = http2.connect(
        'http://localhost:8000');
  
const req = client.request({ 
    ':method': 'GET', ':path': '/' });
  
req.on('response', (responseHeaders) => {
    console.log("status : " 
    + responseHeaders[":status"]);
});
  
req.on('data', (data) => {
    console.log('Received: %s ',
        data.toString().replace(/(\n)/gm, ""));
});
  
req.on('end', () => {
    client.close(() => {
        console.log("client closed");
    })
});

使用以下命令运行index.js文件：

node index.js

输出：

max frame size :- 163955
status : 200
Received: hello
Received: world
client closed
server closed

示例 2：文件名：index.js

Javascript

// Node.js program to demonstrate the
// http2.getUnpackedSettings() method
  
const http2 = require('http2');
const fs = require('fs');
  
// Private key and public certificate
// for access
const options = {
    key: fs.readFileSync('private-key.pem'),
    cert: fs.readFileSync('public-cert.pem'),
};
  
// Creating and initializing server
// by using http2.createServer() method
const server = http2.createServer(options);
  
// Getting packed setting by using
// getPackedSettings() method
const value = http2.getPackedSettings({ 
        maxHeaderListSize: 655353 })
  
  
const unpacked = http2.getUnpackedSettings(value);
  
console.log("max Header list Size :- " 
    + unpacked.maxHeaderListSize);
  
server.on('stream', (stream, requestHeaders) => {
    stream.end('world');
  
    // Stopping the server
    // by using the close() method
    server.close(() => {
        console.log("server closed");
    })
});
  
server.listen(8000);
  
  
// Creating and initializing client
// by using tls.connect() method
const client = http2.connect(
        'http://localhost:8000');
  
const req = client.request({ 
    ':method': 'GET', ':path': '/' });
  
req.on('data', (data) => {
    console.log('Received: %s ',
        data.toString().replace(/(\n)/gm, ""));
});
  
req.on('end', () => {
    client.close(() => {
        console.log("client closed");
    })
});

使用以下命令运行index.js文件：

node index.js

输出：

max Header list Size :- 655353
Received: world
client closed
server closed

参考： https://nodejs.org/dist/latest-v12.x/docs/api/http2.html#http2_http2_getunpackedsettings_buf