Node.js http.IncomingMessage.httpVersion 方法

http.IncomingMessage.httpVersion是http 模块中Incoming Message 类的内置应用程序编程接口，用于获取客户端发送的HTTP 版本。最常用的版本是 HTTP/1.1。

句法：

request.httpVersion

参数：此方法不接受任何参数作为参数。

返回值：该方法返回客户端发送的HTTP版本。

示例 1：文件名：index.js

// Node.js program to demonstrate the  
// request.httpVersion Method 
  
// Importing http module 
var http = require('http');
  
// Setting up PORT 
const PORT = process.env.PORT || 3000;
  
// Creating http Server 
var httpServer = http.createServer(
    function (request, response) {
  
    // Getting httpVersion by using
    // request.httpVersion Api
    const http_version = request.httpVersion;
  
    // Display the result
    response.end("Httpversion : " 
        + http_version, 'utf8', () => {
          
        console.log("displaying the result...");
  
        // Closing the server
        httpServer.close(() => {
            console.log("server is closed")
        })
    });
});
  
// Listening to http Server 
httpServer.listen(PORT, () => {
    console.log("Server is running at port 3000...");
});

执行命令：

node index.js

控制台输出：

Server is running at port 3000...
displaying the result...
displaying the result...
server is closed
server is closed

浏览器输出：将本地主机地址 http://localhost:3000/ 粘贴到浏览器的搜索栏中。

示例 2：文件名：index.js

// Node.js program to demonstrate the  
// request.httpVersion Method 
  
// Importing http module 
var http = require('http');
  
// Request and response handler 
const http2Handlers = (request, response) => {
  
    // Getting httpVersion by using
    // request.httpVersion Api
    const http_version = request.httpVersion;
  
    // Display result
    response.end("Httpversion : " 
        + http_version, 'utf8', () => {
  
        console.log("displaying the result...");
  
        // Closing the server
        httpServer.close(() => {
            console.log("server is closed")
        })
    });
};
  
// Creating http Server and listening
// on given port number
var httpServer = http.createServer(
    http2Handlers).listen(3000, () => {
    console.log("Server is running at port 3000...");
});

执行命令：

node index.js

控制台输出：

Server is running at port 3000...
displaying the result...
displaying the result...
server is closed
server is closed

浏览器输出：将本地主机地址 http://localhost:3000/ 粘贴到浏览器的搜索栏中。

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