Node.js 服务器http2session.altsvc() 方法

serverhttp2session.altsvc()是 http2 模块中 serverhttp2session 类的内置应用程序编程接口，用于向连接的客户端提交 ALTSVC 帧（由 RFC 7838 定义）。

句法：

const serverhttp2session.altsvc(alt, originOrStream)

参数：此方法将以下参数作为参数。

alt： RFC 7838 定义的替代服务配置的描述。
originOrStream：指定来源的 URL字符串（或具有 origin 属性的对象）或由 http2stream.id 属性给出的活动 Http2Stream 的数字标识符。

返回值：此方法不返回任何值。

如何生成私钥和公共证书

私钥

步骤 - 1：打开记事本并复制并粘贴以下密钥

第 2 步：另存为private-key.pem

公共证书

步骤 - 1：打开记事本并复制并粘贴以下密钥

第 2 步：另存为public-cert.pem

示例 1：文件名：index.js

Javascript

// Node.js program to demonstrate the
// serverhttp2session.altsvc() 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);
 
server.on('session', (session) => {
  // Set altsvc for origin https://example.org:80
  session.altsvc('h2=":8000"', 'http://localhost:8000');
  console.log("ALTSVC frame is submitted")
});
 
 
server.on('stream', (stream, requestHeaders) => {
 
  // setting response header to client
  // by using respond() method
  stream.respond({ ':status': 200, 'content-type': 'text/plain' });
  stream.write('hello ');
 
   // checking if header is sent or not
   // by using pushAllowed method
   const status = stream.pushAllowed;
 
   if(status)
      stream.end("push stream is accepted");
   else
      stream.end("push stream is not accepted");
 
  // stopping the server by
  // using the close() method
  server.close(()=>{
    console.log("server destroyed");
  })
});
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 destroyed");
  })
   
});

Javascript

// Node.js program to demonstrate the
// serverhttp2session.altsvc() API
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);
 
server.on('stream', (stream, requestHeaders) => {
 
  // Setting response header to client
  // by using respond() method
  stream.respond({
    ':status': 200,
    'content-type': 'text/plain'
  });
 
  stream.write('hello ');
 
  const session = stream.session;
 
  // Set altsvc for origin
  // https://example.org:80
  session.altsvc('h2=":8000"',
    'http://localhost:8000');
 
  stream.end("ALTSVC frame is submitted")
 
  // Stopping the server by
  // using the close() method
  server.close(()=>{
    console.log("server destroyed");
  })
});
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 destroyed");
  })
   
});

输出：

ALTSVC frame is submitted
status : 200
Received: hello
Received: push stream is accepted
client destroyed
server destroyed

使用以下命令运行 index.js 文件：

node index.js

示例 2：文件名：index.js

Javascript

// Node.js program to demonstrate the
// serverhttp2session.altsvc() API
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);
 
server.on('stream', (stream, requestHeaders) => {
 
  // Setting response header to client
  // by using respond() method
  stream.respond({
    ':status': 200,
    'content-type': 'text/plain'
  });
 
  stream.write('hello ');
 
  const session = stream.session;
 
  // Set altsvc for origin
  // https://example.org:80
  session.altsvc('h2=":8000"',
    'http://localhost:8000');
 
  stream.end("ALTSVC frame is submitted")
 
  // Stopping the server by
  // using the close() method
  server.close(()=>{
    console.log("server destroyed");
  })
});
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 destroyed");
  })
   
});

输出：

status : 200
Received: hello
Received: ALTSVC frame is submitted
client destroyed
server destroyed

使用以下命令运行 index.js 文件：

node index.js

参考： https://nodejs.org/dist/latest-v12.x/docs/api/http2.html#http2_serverhttp2session_altsvc_alt_originorstream