Node.js http.ServerResponse.writableEnded用法及代碼示例

httpServerResponse.writableEnded是http模塊中服務器響應類的內置應用程序編程接口，用於檢查是否已調用response.end()。

用法:

response.writableEnded

參數：此方法不接受任何參數。

返回值：當且僅當response.end()被調用，否則返回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...");  
});

使用以下命令運行index.js文件：

node index.js

控製台輸出：

Server is running at port 3000...
displaying the result...
displaying the result...
server is closed
server is closed

瀏覽器輸出：粘貼本地主機地址http：//localhost：3000 /。在瀏覽器的搜索欄中。

輸出：

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...");  
});

使用以下命令運行index.js文件：

node index.js

控製台輸出：

Server is running at port 3000...

瀏覽器輸出：粘貼localhost地址http：//localhost：3000 /。在瀏覽器的搜索欄中。

輸出：

Response.end() has been not called

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

相關用法

注：本文由純淨天空篩選整理自RohitPrasad3大神的英文原創作品 Node.js http.ServerResponse.writableEnded Property。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。