Node.js http.IncomingMessage.headers 方法

http.IncomingMessage.headers是 HTTP 模块中 IncomingMessage 类的内置应用程序编程接口，用于获取所有请求/响应标头对象。

句法：

const message.headers

参数：此方法不接受任何参数作为参数。

返回值：此方法返回所有请求/响应标头对象。

示例 1：

文件名：index.js

Javascript

// Node.js program to demonstrate the 
// request.headers 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 request/response header
  // by using request.complete method
  const value = request.headers;
 
  // Display header
  console.log(value.connection)
 
  // Display result
  response.end("hello world", 'utf8', () => {
    console.log("displaying the result...");
 
    httpServer.close(() => {
      console.log("server is closed")
    })
  });
});
 
// Listening to http Server
httpServer.listen(PORT, () => {
  console.log("Server is running at port 3000...");
});

使用以下命令运行index.js文件。

node index.js

输出：

Output: In-Console
Server is running at port 3000...
keep-alive
displaying the result...

现在在浏览器中访问http://localhost:3000/ ，你会看到如下输出：

hello world

示例 2：

文件名：index.js

Javascript

// Node.js program to demonstrate the 
// request.headers Method
 
// Importing http module
var http = require('http');
 
// Request and response handler
const http2Handlers = (request, response) => {
 
  // Getting request/response header
  // by using request.complete method
  const value = request.headers;
 
  // Display header
  console.log(value.host)
 
  // Display result
  response.end("hello world!!", 'utf8', () => {
    console.log("displaying the result...");
 
    httpServer.close(() => {
      console.log("server is closed")
    })
  });
};
 
// Creating http Server
var httpServer = http.createServer(
  http2Handlers).listen(3000, () => {
  console.log("Server is running at port 3000...");
});

使用以下命令运行index.js文件。

node index.js

输出：

Server is running at port 3000...
localhost:3000
displaying the result...

现在在浏览器中访问http://localhost:3000/ ，你会看到如下输出：

hello world!!

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