The httpServerResponse.getHeader() is an inbuilt application programming interface of the class Server Response within http module which is used to get the response header of the particular name.
Syntax:
response.getHeader(name)
Parameters: This method accepts the name of the header as the parameter.
Return Value: This method returns the value of the particular header object.
Example 1: Filename: index.js
// Node.js program to demonstrate the // response.getHeader(name) APi // Importing http module const http = require( 'http' );
// Setting up PORT const PORT = process.env.PORT || 3000; // Creating http Server const httpServer = http.createServer( function (request, response) {
// Getting header value
// by using response.getHeader(name) Api
const value = response.getHeaders();
// Display the header value
console.log(value)
// Display result
response.end( "hello world " , 'utf8' , () => {
console.log( "displaying the result..." );
// Closing the server
httpServer.close(() => {
console.log( "server is closed" )
})
});
});
// Listening to http Server httpServer.listen(PORT, () => { console.log( "Server is running at port 3000..." );
}); |
Steps to run:
node index.js
Console output:
Server is running at port 3000... [Object: null prototype] {} displaying the result... [Object: null prototype] {} displaying the result... server is closed server is closed
Browser Output: Paste the localhost address http://localhost:3000/. In the search bar of the browser.
hello world
Example 2: Filename: index.js
// Node.js program to demonstrate the // response.getHeader(name) APi // Importing http module const http = require( 'http' );
// Request and response handler const http2Handlers = (request, response) => { // Setting the response header
response.setHeader( 'Content-Type' , 'text/html' );
// Getting header
// by using response.getHeader() Api
const value = response.getHeader( 'Content-Type' );
// Display result
response.end( "header value : "
+ value, 'utf8' , () => {
console.log( "displaying the result..." );
// Closing the server
httpServer.close(() => {
console.log( "server is closed" )
})
});
}; // Creating http Server and listening // on the 3000 port const httpServer = http.createServer( http2Handlers).listen(3000, () => {
console.log( "Server is running at port 3000..." );
});
|
Steps to run:
node index.js
Console output:
Server is running at port 3000... [Object: null prototype] {} displaying the result... [Object: null prototype] {} displaying the result... server is closed server is closed
Browser Output: Paste the localhost address http://localhost:3000/. In the search bar of the browser.
header value : text/html
Reference: https://nodejs.org/dist/latest-v12.x/docs/api/http.html#http_response_getheader_name