Node.js http.server.maxHeadersCount 属性

http.server.maxHeadersCount是 HTTP 模块中的 Server 类的内置应用程序编程接口，用于获取最大传入标头计数。

句法：

const server.maxHeadersCount

参数：此属性不接受任何参数作为参数。

返回值： T 不返回任何值。

示例 1：文件名-index.js

Javascript

// Node.js program to demonstrate the  
// server.maxHeadersCount property
  
// 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 the reference of the 
    // underlying socket object
    // by using socket method
    const value = response.socket;
  
    // Display result by using end() method
    response.end("socket buffersize : " 
        + value.bufferSize, 'utf8', () => {
            console.log("displaying the result...");
  
            // Closing server 
            // by using close() method
            httpServer.close(() => {
                console.log("server is closed")
            })
    });
});
  
// Listening to http Server 
// by using listen() method
httpServer.listen(PORT, () => {
    console.log("Server is running at port 3000...");
});
  
// Getting max header count 
// by using maxHeadersCount method
const v = httpServer.maxHeadersCount
  
// Display the result
console.log('maximum header count :-' + v)

使用以下命令运行index.js文件：

node index.js

输出：

maximum header count :-null
Server is running at port 3000...
displaying the result...
server is closed

现在在浏览器中运行http://localhost:3000/ ，您将在屏幕上看到以下输出：

socket buffersize : 0

示例 2：文件名-index.js

Javascript

// Node.js program to demonstrate the  
// server.maxHeadersCount method
  
// Importing http module 
var http = require('http');
  
// Request and response handler 
const http2Handlers = (request, response) => {
  
    // Getting the reference of the 
    // underlying socket object
    // by using socket method
    const value = response.socket;
  
    // Display result by using end() method
    response.end("socket local address : "
        + value.localAddress, 'utf8', () => {
            console.log("displaying the result...");
  
            // Closing server 
            // by using close() method
            httpServer.close(() => {
                console.log("server is closed")
            })
        });
};
  
// Listening to http Server 
// by using listen() method
var httpServer = http.createServer(
    http2Handlers).listen(3000, () => {
    console.log("Server is running at port 3000...");
});
  
// Getting max header count 
// by using maxHeadersCount method
const v = httpServer.maxHeadersCount
  
if (v || v > 1) {
    console.log("maximum header count is greater than 1")
} else {
    console.log("maximum header count is less than 1")
}

使用以下命令运行index.js文件：

node index.js

输出：

maximum header count is less than 1
Server is running at port 3000...
displaying the result...
server is closed

现在在浏览器中运行http://localhost:3000/ ，您将在屏幕上看到以下输出：

socket local address : ::1

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