Node.js http.ServerResponse.getHeader()用法及代码示例

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

用法:

 response.getHeader(name)

参数：此方法接受标头名称作为参数。

返回值：此方法返回特定标头对象的值。

示例1：Filename：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localhost地址http：//localhost：3000 /。在浏览器的搜索栏中。

hello world

示例2：Filename：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localhost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

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注：本文由纯净天空筛选整理自RohitPrasad3大神的英文原创作品 Node.js http.ServerResponse.getHeader() Method。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。