Node.js Http2ServerResponse.writeHead() 方法

Http2ServerResponse.writeHead()是 http2 模块中类 Http2ServerResponse 的内置应用程序编程接口，用于将响应头发送到请求。

句法：

response.writeHead(statusCode[, statusMessage][, headers])

参数：此方法接受以下参数作为参数。

statusCode： 3 位 HTTP 状态码。
statusMessage：它是人类可读的状态消息。它是一个可选参数。
headers：这是作为参数传递的响应标头。它是一个可选参数。

返回值：此方法没有任何返回值。

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

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另存为public-cert.pem

示例 1：文件名：index.js

Javascript

// Node.js program to demonstrate the
// Http2ServerResponse.writeHead() 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'),
};
  
// Request and response handler
const http2Handlers = (request, response) => {
  
    // Sending the data to the client
    // by using response.writeHead() method
    response.writeHead(200, {
        'Content-Length': Buffer.byteLength('hello world'),
        'Content-Type': 'text/plain; charset=utf-8'
    });
  
    // Sending the signal to the client
    response.end("hello world")
};
  
// Creating and initializing server
// by using http2.createServer() method
const server = http2.createServer(options, http2Handlers);
  
server.on('stream', (stream, requestheader) => {
    stream.write('hello ');
  
    // Getting all information of this http2stream object
    // by using state method
    const status = stream.state;
  
    stream.end("priority weight : " + status.weight);
  
    // 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', (responsesocket) => {
    console.log(responsesocket);
});
  
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
// Http2ServerResponse.writeHead() 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'),
};
  
// Request and response handler
const http2Handlers = (request, response) => {
  
    // Sending the data to the client
    // by using response.writeHead() method
    response.writeHead(200, {
        'Content-Length': Buffer.byteLength('hello world'),
        'Content-Type': 'text/plain; charset=utf-8'
    });
  
    // Sending the signal to client
    response.end("hello world")
};
  
// Creating and initializing server
// by using http2.createServer() method
const server = http2.createServer(
    options, http2Handlers);
  
server.on('stream', (stream, requestheader) => {
  
    // 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', (responsesocket) => {
    console.log(responsesocket);
});
  
req.on('end', () => {
    client.close(() => {
        console.log("client destroyed");
    })
});

使用以下命令运行index.js文件：

node index.js

输出：

[Object: null prototype] {
  ':status': 200,
  'content-length': '11',
  'content-type': 'text/plain; charset=utf-8',
  date: 'Sun, 06 Dec 2020 14:12:00 GMT'
}
Received: hello world
client destroyed
server destroyed

示例 2：文件名：index.js

Javascript

// Node.js program to demonstrate the
// Http2ServerResponse.writeHead() 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'),
};
  
// Request and response handler
const http2Handlers = (request, response) => {
  
    // Sending the data to the client
    // by using response.writeHead() method
    response.writeHead(200, {
        'Content-Length': Buffer.byteLength('hello world'),
        'Content-Type': 'text/plain; charset=utf-8'
    });
  
    // Sending the signal to client
    response.end("hello world")
};
  
// Creating and initializing server
// by using http2.createServer() method
const server = http2.createServer(
    options, http2Handlers);
  
server.on('stream', (stream, requestheader) => {
  
    // 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', (responsesocket) => {
    console.log(responsesocket);
});
  
req.on('end', () => {
    client.close(() => {
        console.log("client destroyed");
    })
});

使用以下命令运行index.js文件：

node index.js

输出：

[Object: null prototype] {
  ':status': 200,
  'content-length': '11',
  'content-type': 'text/plain; charset=utf-8',
  date: 'Sun, 06 Dec 2020 14:39:31 GMT'       
}

参考：

https://nodejs.org/dist/latest-v12.x/docs/api/http2.html#http2_response_writehead_statuscode_statusmessage_headers