Node.js http.ClientRequest.connection 属性

http.ClientRequest.connection是 HTTP 模块中 ClientRequest 类的内置应用程序编程接口，用于获取底层客户端请求套接字的引用。

句法：

const request.connection

参数：它不接受任何参数作为参数。

返回值：不返回任何值。

示例 1：文件名-index.js

Javascript

// Node.js program to demonstrate the 
// request.connection method
 
// Importing http module
const http = require('http');
 
// Create an HTTP server
const server = http.createServer((req, res) => {
    res.writeHead(200, { 'Content-Type': 'text/plain' });
    res.end('okay');
});
 
// Now that server is running
server.listen(3000, '127.0.0.1', () => {
 
    // Make a request
    const options = {
        port: 3000,
        host: '127.0.0.1',
        headers: {
            'Connection': 'Upgrade',
            'Upgrade': 'websocket'
        }
    };
 
    // Getting client request
    const req = http.request(options);
 
    // Getting request socket
    // by using connection method
    const v = req.connection;
 
    // Display the result
    console.log("request socket :- " + v)
 
    process.exit(0)
});

使用以下命令运行index.js文件：

node index.js

输出：

request socket :- null

示例 2：文件名-index.js

Javascript

// Node.js program to demonstrate the 
// request.connection method
 
// Importing http module
const http = require('http');
 
// Create an HTTP server
http.createServer((req, res) => { })
.listen(3000, '127.0.0.1', () => {
 
    // Getting client request
    const req = http.request({
        port: 3000,
        host: '127.0.0.1',
    });
 
    // Getting request socket
    // by using connection method
    if (req.connection) {
        console.log("Requested for Connection")
    } else {
        console.log("Not Requested for Connection")
    }
 
    process.exit(0)
});

使用以下命令运行index.js文件：

node index.js

输出：

Not Requested for Connection

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