Node.js response.removeHeader() 方法

response.removeHeader() （在 v0.9.3 中添加）属性是“ http ”模块的内置属性，它删除由排队等待隐式发送的名称标识的标头。标头名称匹配不区分大小写。 response.getHeaders()方法返回的对象在原型上并不继承自 JavaScript 对象。

为了得到响应和正确的结果，我们需要导入' http '模块。

const http = require('http');

句法：

response.removeHeader(name);

参数：此属性接受如上所述和如下所述的单个参数：

• name < String > ：它接受标题的名称，不区分大小写。

返回值：它不返回任何值，而是删除排队等待隐式发送的标头。

下面的示例说明了在 Node.js 中response.removeHeader()属性的使用。

示例 1：文件名：index.js

Javascript

// Node.js program to demonstrate the
// response.removeHeader() 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(req, response) {
 
  // Setting up Headers
  response.setHeader('Alfa', 'Beta');
  response.setHeader('Cookie-Setup',
         ['Alfa=Beta', 'Beta=Romeo']);
 
  console.log("Before removing headers...")
   
  // Checking and  printing the headers
  console.log("When Header is set an Array:",
  response.hasHeader('Cookie-Setup'));
 
  // Removing Headers
  response.removeHeader('Cookie-Setup');
 
  console.log("After removing headers...")
   
  // Checking and  printing the headers
  console.log("When Header is set an Array:",
  response.hasHeader('Cookie-Setup'));
 
  // Printing those headers
  console.log(response.getHeaders());
 
  response.end();
});
 
// Listening to http Server
httpServer.listen(PORT, () => {
    console.log("Server is running at port 3000...");
});

现在在浏览器中运行http://localhost:3000/ 。

输出：

Output: (In Console)

>> Server is running at port 3000…

>> Before removing headers…

   When Header is set an Array: true

>> After removing headers…

   When Header is set an Array: false

>> [Object: null prototype] { alfa: ‘Beta’}

示例 2：文件名：index.js

Javascript

// Node.js program to demonstrate the
// response.removeHeader() 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(req, response) {
 
  // Setting up Headers
  response.setHeader('Alfa', 'Beta');
  response.setHeader('Alfa1', '');
  response.setHeader('Alfa2', 5);
  response.setHeader('Cookie-Setup',
  ['Alfa=Beta', 'Beta=Romeo']);
 
  console.log("Before removing headers...")
   
  // Checking and  printing the headers
  console.log("When Header is set an Array:",
  response.hasHeader('Cookie-Setup'));
  console.log("When Header is set an 'Beta':",
  response.hasHeader('Alfa'));
  console.log("When Header is set '':",
  response.hasHeader('Alfa1'));
  console.log("When Header is set number 5:",
  response.hasHeader('alfa2'));
  console.log("When Header is not set:",
  response.hasHeader('Content-Type'));
 
  // Removing Headers
  response.removeHeader('Cookie-Setup');
  response.removeHeader('ALFA2');
 
  console.log("After removing headers...")
   
  // Checking and  printing the headers
  console.log("When Header is set an Array:",
  response.hasHeader('Cookie-Setup'));
  console.log("When Header is set an 'Beta':",
  response.hasHeader('Alfa'));
  console.log("When Header is set '':",
  response.hasHeader('Alfa1'));
  console.log("When Header is set number 5:",
  response.hasHeader('alfa2'));
  console.log("When Header is not set:",
  response.hasHeader('Content-Type'));
 
  // Getting the set Headers
  const headers = response.getHeaders();
   
  // Printing those headers
  console.log(headers);
 
  var Output = "Hello GeeksforGeeks...,"
    + " Available headers are:"
    + JSON.stringify(headers);
 
  // Prints Output on browser in response
  response.write(Output);
  response.end();
});
 
// 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：

Output: (In Console)

>> Server is running at port 3000…

>> Before removing headers…

    When Header is set an Array: true

    When Header is set an ‘Beta’: true

    When Header is set ”: true

    When Header is set number 5: true

    When Header is not set: false

>> After removing headers…

    When Header is set an Array: false

    When Header is set an ‘Beta’: true

    When Header is set ”: true

    When Header is set number 5: false

    When Header is not set: false

>> [Object: null prototype] { alfa: ‘Beta’, alfa1: ” }

现在在浏览器中运行http://localhost:3000/ 。

Output: (In Browser)

Hello GeeksforGeeks…, Available headers are:{“alfa”:”Beta”, “alfa1″:””}

参考： https://nodejs.org/api/http.html#http_response_removeheader_name