Node.js Http2ServerResponse.writeHead()用法及代碼示例

Http2ServerResponse.writeHead()是http2模塊內的Http2ServerResponse類的內置應用程序編程接口，用於將響應頭發送到請求。

用法:

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

參數：此方法接受以下參數作為參數。

statusCode:它是3位數的HTTP狀態代碼。
statusMessage:這是人類可讀的狀態消息。它是一個可選參數。
headers:這是作為參數傳遞的響應頭。它是一個可選參數。

返回值：此方法無返回值。

如何生成私鑰和公共證書？

1.文件名：私鑰

打開記事本和copy-paste下麵的項並將文件另存為private-key.pem

2.文件名：公開證書

打開記事本和copy-paste下麵的項並將文件另存為public-cert.pem

示例1：Filename：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"); 
    }) 
});

使用以下命令運行index.js文件：

node index.js

輸出：

[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：Filename：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"); 
    }) 
});

使用以下命令運行index.js文件：

node index.js

輸出：

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

參考：

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

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注：本文由純淨天空篩選整理自RohitPrasad3大神的英文原創作品 Node.js Http2ServerResponse.writeHead() Method。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。