Node.js http.ClientRequest.setHeader()用法及代码示例

http.ClientRequest.setHeader()是HTTP模块内的ClientRequest类的内置应用程序编程接口，该接口用于设置标头的对象。

用法:

const request.setHeader(name, value)

参数：此方法将特定标头的名称和值作为参数作为键值对。

返回值：此方法无返回值。

范例1：Filename-index.js

Javascript

// Node.js program to demonstrate the   
// request.setHeader() method 
  
// Importing http module 
const http = require('http'); 
  
// Create an HTTP server 
http.createServer((req, res) => { }) 
  .listen(3000, '127.0.0.1', () => { 
  
  // Getting client request 
  const req = http.request({ 
    port:3000, 
    host:'127.0.0.1', 
  }); 
  
  req.setHeader('content-type', 'text/html'); 
  
  console.log("before operation:- " 
    + req.getHeader('content-type')) 
  
  // Removing header by using 
  // removeHeader() method 
  req.removeHeader('content-type') 
  
  console.log("after operation:- " 
  + req.getHeader('content-type')) 
  
  process.exit(0) 
});

使用以下命令运行index.js文件：

node index.js

输出：

before operation:- text/html
after operation:- undefined

示例2：Filename-index.js

Javascript

// Node.js program to demonstrate the   
// request.setHeader() method 
  
// Importing http module 
const http = require('http'); 
  
// Create an HTTP server 
const server = http.createServer((req, res) => { 
  res.writeHead(200, { 'Content-Type':'text/plain' }); 
  res.end('okay'); 
}); 
  
// Now that server is running 
server.listen(3000, '127.0.0.1', () => { 
  
  // Make a request 
  const options = { 
    port:3000, 
    host:'127.0.0.1', 
    headers:{ 
      'Connection':'Upgrade', 
      'Upgrade':'websocket'
    } 
  }; 
  
  // Getting client request 
  const req = http.request(options); 
  
  req.setHeader('Cookie', ['type=ninja', 
            'language=javascript']); 
  
  console.log("before operation:- " 
  + req.getHeader('Cookie')) 
  
  // Removing header by using 
  // removeHeader() method 
  req.removeHeader('Cookie') 
  
  console.log("after operation:- " 
  + req.getHeader('Cookie')) 
  
  process.exit(0) 
});

使用以下命令运行index.js文件：

node index.js

输出：

before operation:- type=ninja,language=javascript
after operation:- undefined

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

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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.ClientRequest.setHeader() Method。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。