Node.js http。server response . header sent 属性
原文:https://www . geesforgeks . org/node-js-http-server response-header sent-property/
HTTP ServerResponse . header sent是 HTTP 模块内类 servereresponse 的一个内置应用编程接口，用于检查报头是否已经发送。
语法:
const response.headersSent
参数:该属性不接受任何参数作为参数。
返回值:当且仅当发送了标头时，此属性返回真，否则返回假。
示例 1: Filename-index.js
java 描述语言
// Node.js program to demonstrate the
// response.headersSent() 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) {
// Checking if response header is sent or not
// by using headersSent method
const value = response.headersSent;
// Display result by using end() method
response.end("Headers have been sent : "
+ 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
现在打开浏览器，转到http://localhost:3000/，会看到如下输出:
Headers have been sent : false
示例 2:Filename-index . js
Javascript
// Node.js program to demonstrate the
// response.headersSent() method
// Importing http module
var http = require('http');
// Request and response handler
const httpHandlers = (request, response) => {
// Checking if response header is sent or not
// by using headersSent method
const value = response.headersSent;
// Display result by using end() method
response.end("Headers have been sent : "
+ value, 'utf8', () => {
console.log("displaying the result...");
httpServer.close(() => {
console.log("server is closed")
})
});
};
// Creating http Server
var httpServer = http.createServer(
httpHandlers).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...
displaying the result...
server is closed
现在打开浏览器，转到http://localhost:3000/，会看到如下输出:
Headers have been sent : false
参考:T2【https://nodejs . org/dist/latest-v 12 . x/docs/API/http . html # http _ response _ header sent
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