Node.js http.ServerResponse.getHeader() 方法

httpServerResponse.getHeader()是http 模块中Server Response 类的内置应用程序编程接口，用于获取特定名称的响应头。

句法：

response.getHeader(name)

参数：此方法接受标头的名称作为参数。

返回值：此方法返回特定标头对象的值。

示例 1：文件名：index.js

Javascript

// Node.js program to demonstrate the  
// response.getHeader(name) APi
    
// 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 header value
  // by using response.getHeader(name) Api
  const value = response.getHeaders();
  
  // Display the header value
  console.log(value)
    
  // Display result
  response.end( "hello world ", '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...
[Object: null prototype] {}
displaying the result...
[Object: null prototype] {}
displaying the result...
server is closed
server is closed

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

hello world 

示例 2：文件名：index.js

Javascript

// Node.js program to demonstrate the  
// response.getHeader(name) APi
    
// Importing http module 
var http = require('http'); 
  
// Request and response handler 
const http2Handlers = (request, response) => { 
  
  // Setting the response header
  response.setHeader('Content-Type', 'text/html');
    
  // Getting header
  // by using response.getHeader() Api
  const value = response.getHeader('Content-Type');
    
  // Display result
  response.end( "header value  : " 
  + value, 'utf8', () => { 
      console.log("displaying the result..."); 
  
      // Closing the server
      httpServer.close(()=>{
          console.log("server is closed")
      })
  });
  }; 
    
// Creating http Server and listening
// on the 3000 port
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...
[Object: null prototype] {}
displaying the result...
[Object: null prototype] {}
displaying the result...
server is closed
server is closed

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

header value : text/html

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