Node.js http2session.pendingSettingsAck 方法

http2session.pendingSettingsAck是 http2 模块中 http2session 类的内置应用程序编程接口，用于指示 Http2Session 当前是否正在等待确认已发送的 SETTINGS 帧。

句法：

const http2session.pendingSettingsAck

参数：此方法不接受任何参数。

返回值：此方法在调用http2session.settings()方法后返回 true，否则如果已确认所有发送的 SETTINGS 帧，则返回 false。

如何生成私钥和公共证书

私钥

步骤 - 1：打开记事本并复制粘贴以下密钥

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
// http2session.pendingSettingsAck 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() api
const server = http2.createServer(options);
  
  
server.on('stream', (stream, requestHeaders) => {
  stream.respond({ 
    ':status': 200, 
    'content-type': 'text/plain' 
  });
  
  stream.write('hello ');
  
   const http2session = stream.session;
  
   // Checking if the acknowledgement is received
   // or not by using pendingSettingsAck API
   const status = http2session.pendingSettingsAck;
  
  
   if(status)
   stream.end("all frame is not  acknowledged")
   else
   stream.end("all frames are acknowledged")
  
  // Stopping the server by
  // using the close() method
  server.close(()=>{
    console.log("server localSettings");
  })
});
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 localSettings");
  })
});

Javascript

// Node.js program to demonstrate the
// http2session.pendingSettingsAck 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() api
const server = http2.createServer(options);
  
  
server.on('stream', (stream, requestHeaders) => {
  
   // Getting session object
   // by using session api
   const http2session = stream.session;
  
   // Checking if the acknowledgement is received
   // or not by using pendingSettingsAck API
   const status = http2session.pendingSettingsAck;
  
   if(status)
     stream.end("all frame is not  acknowledged")
   else
     stream.end("all frames are acknowledged")
  
  // 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('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: all frame is not  acknowledged
client localSettings
server localSettings

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
// http2session.pendingSettingsAck 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() api
const server = http2.createServer(options);
  
  
server.on('stream', (stream, requestHeaders) => {
  
   // Getting session object
   // by using session api
   const http2session = stream.session;
  
   // Checking if the acknowledgement is received
   // or not by using pendingSettingsAck API
   const status = http2session.pendingSettingsAck;
  
   if(status)
     stream.end("all frame is not  acknowledged")
   else
     stream.end("all frames are acknowledged")
  
  // 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('data', (data) => {
  
  console.log('Received: %s ',
    data.toString().replace(/(\n)/gm,""));
});
  
req.on('end', () => {
  client.close(()=>{
    console.log("client destroyed");
  })
});

输出：

Received: all frame is not  acknowledged
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_http2session_pendingsettingsack