Node.js http.IncomingMessage.rawTrailers 方法

http.IncomingMessage.rawTrailers是 HTTP 模块中 IncomingMessage 类的内置应用程序编程接口，用于获取原始请求/响应预告片键和值，与接收到的完全相同。

句法：

const message.rawTrailers

参数：此方法不接受任何参数作为参数。

返回值：此方法返回原始请求/响应预告片键和值，与收到的内容完全相同。

示例 1：文件名：index.js

Javascript

// Node.js program to demonstrate the  
// request.rawTrailers method
  
// 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 rawTrailers by using
  // request.rawTrailers method
  const value = request.rawTrailers
  console.log(value)
  
  // Display result
  response.end("rawTrailers", value, 'utf8', () => {
    console.log("displaying the result...");
  
    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

输出：

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

现在在浏览器中访问http://localhost:3000/ ，你会看到如下输出：

rawTrailers  

示例 2：文件名：index.js

Javascript

// Node.js program to demonstrate the  
// request.rawTrailers method
  
// Importing http module 
var http = require('http');
  
// Request and response handler 
const http2Handlers = (request, response) => {
  
  // Getting rawTrailers 
  // by using request.rawTrailers method
  const value = request.rawTrailers;
   
  if(!value) console.log('No rawTrailers added')
  
  // Display result
  response.end("rawTrailers" + value, 'utf8', () => {
    console.log("displaying the result...");
  
    httpServer.close(() => {
      console.log("server is closed")
    })
  });
};
  
// 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

输出：

Server is running at port 3000...
No rawTrailers added
displaying the result...
server is closed

现在在浏览器中访问http://localhost:3000/ ，你会看到如下输出：

rawTrailers 

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