Node.js http.ServerResponse.headersSent Property
Last Updated :
06 Apr, 2023
The httpServerResponse.headersSent is an inbuilt application programming interface of class ServerResponse within the HTTP module which is used to check if the header has been sent or not.
Syntax:
const response.headersSent
Parameters: This property does not accept any arguments as a parameter.
Return Value: This property returns true if and only if headers were sent otherwise false.
Example 1: Filename-index.js
Javascript
const http = require( 'http' );
const PORT = process.env.PORT || 3000;
const httpServer = http.createServer(
function (request, response) {
const value = response.headersSent;
response.end( "Headers have been sent : "
+ value, 'utf8' , () => {
console.log( "displaying the result..." );
httpServer.close(() => {
console.log( "server is closed" )
})
});
});
httpServer.listen(PORT, () => {
console.log( "Server is running at port 3000..." );
});
|
Run the index.js file using the following command:
node index.js
Output:
Server is running at port 3000...
displaying the result...
server is closed
Now open your browser and go to http://localhost:3000/, you will see the following output:
Headers have been sent : false
Example 2: Filename-index.js
Javascript
const http = require( 'http' );
const httpHandlers = (request, response) => {
const value = response.headersSent;
response.end( "Headers have been sent : "
+ value, 'utf8' , () => {
console.log( "displaying the result..." );
httpServer.close(() => {
console.log( "server is closed" )
})
});
};
const httpServer = http.createServer(
httpHandlers).listen(3000, () => {
console.log( "Server is running at port 3000..." );
});
|
Run the index.js file using the following command:
node index.js
Output:
Server is running at port 3000...
displaying the result...
server is closed
Now open your browser and go to http://localhost:3000/, you will see the following output:
Headers have been sent : false
Reference: https://nodejs.org/dist/latest-v12.x/docs/api/http.html#http_response_headerssent
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