Node.js http.ServerResponse.writableEnded 属性

httpServerResponse.writableEnded是http 模块中Server Response 类的内置应用程序编程接口，用于检查response.end() 是否已被调用。

句法：

response.writableEnded

参数：此方法不接受任何参数。

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

示例 1：文件名：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：文件名：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(
"
Response.end() has been called
")
  else
    response.write(
"
Response.end() has been not called
")
  
  // 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：粘贴本地主机地址 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