Node.js http2.constants用法及代码示例

http2.constants 是 http2 模块中类 http2 的内置应用程序编程接口，用于为特定错误提供错误代码。

用法:

const http2.constants

参数:它不接受任何参数作为参数。

返回值:它返回特定错误的错误代码。

如何生成私钥和公共证书？

1.文件名：私钥

打开记事本和copy-paste下面的项并将文件另存为private-key.pem

2.文件名：公开证书

打开记事本和copy-paste下面的项并将文件另存为public-cert.pem

范例1： 文件名：index.js

Javascript


// Node.js program to demonstrate the
// http2.constants property
  
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);
  
const value =  http2.constants
    .NGHTTP2_FLOW_CONTROL_ERROR
  
console.log("error code:" + value)
  
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：

error code:3
status:200
Received:hello
Received:world
client closed
server closed

范例2： 文件名：index.js

Javascript


// Node.js program to demonstrate the
// http2.constant property
  
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);
  
const value =  http2.constants.NGHTTP2_NO_ERROR
  
console.log("error code:" + value)
  
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：

error code:0
Received:world
client closed
server closed

参考：https://nodejs.org/dist/latest-v12.x/docs/api/http2.html#http2_http2_constants

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注：本文由纯净天空筛选整理自RohitPrasad3大神的英文原创作品 Node.js http2.constants Property。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。