Node.js http.IncomingMessage.trailers 方法

http.IncomingMessage.trailers是 http 模块中传入消息类的内置应用程序编程接口，用于获取请求/响应预告片对象。

句法：

request.trailers or response.trailers

参数：此方法不接受任何参数作为参数。

返回值：此方法返回请求或响应拖车对象。

示例 1：文件名：index.js

Javascript

// Node.js program to demonstrate the  
// request.trailers 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 trailers 
  // by using request.trailers Api
  const value = request.trailers;
  
  // Display the request trailers
  console.log(value)
    
  // Display the 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..."); 
});

Javascript

// Node.js program to demonstrate the  
// request.trailers APi
    
// Importing http module 
var http = require('http'); 
  
// Request and response handler 
const http2Handlers = (request, response) => { 
    
  // Getting trailers 
  // by using request.trailers Api
  const value = request.trailers;
  
  // Display the request trailer
  console.log(value)
    
  // Display result
  response.end( "GeeksForGeeks", '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...
{}
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。

示例 2：文件名：index.js

Javascript

// Node.js program to demonstrate the  
// request.trailers APi
    
// Importing http module 
var http = require('http'); 
  
// Request and response handler 
const http2Handlers = (request, response) => { 
    
  // Getting trailers 
  // by using request.trailers Api
  const value = request.trailers;
  
  // Display the request trailer
  console.log(value)
    
  // Display result
  response.end( "GeeksForGeeks", '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...
{}
displaying the result...
{}
displaying the result...
server is closed
server is closedserver 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。

GeeksForGeeks

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