Node.js http.ServerResponse.writableEnded用法及代码示例

httpServerResponse.writableEnded是http模块中服务器响应类的内置应用程序编程接口，用于检查是否已调用response.end()。

用法:

response.writableEnded

参数：此方法不接受任何参数。

返回值：当且仅当response.end()被调用，否则返回false，此方法返回true。

示例1：Filename：index.js

Javascript

// Node.js program to demonstrate the   
// response.writableEnded 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){  
  
  // Checking if the response.end has  
  // been called or not by using  
  // writableEnded API 
  const value = response.writableEnded; 
  
    
  // Display result 
  // by using end() api 
  response.end( "response.end() has been called:"
      + value, '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...");  
});

使用以下命令运行index.js文件：

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

输出：

response.end() has been called:false

示例2：Filename：index.js

Javascript

// Node.js program to demonstrate the   
// response.writableEnded APi 
    
// Importing http module  
var http = require('http');  
  
// Request and response handler  
const http2Handlers = (request, response) => {  
    
  // Checking if the response.end has 
  // been called or not by using  
  // writableEnded API 
  const value = response.writableEnded; 
    
  if(value) 
    response.write( 
"<h1>Response.end() has been called<h1>") 
  else
    response.write( 
"<h1>Response.end() has been not called<h1>") 
  
  // Ending the response 
  response.end() 
};  
    
// 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

控制台输出：

Server is running at port 3000...

浏览器输出：粘贴localhost地址http：//localhost：3000 /。在浏览器的搜索栏中。

输出：

Response.end() has been not called

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

相关用法

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.writableEnded Property。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。