The http.ClientRequest.getHeader() is an inbuilt application programming interface of class ClientRequest within http module which is used to get the header object of the particular header name.
Syntax:
const request.getHeader(name)
Parameters: This method takes the name of the header as a parameter.
Return Value : This method returns the object of the header as output.
Example 1:
Javascript
// Node.js program to demonstrate the // request.getHeader() APi // 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' );
// getting header
// by using getHeader() api
console.log( "header :- " + req.getHeader( 'content-type' ))
process.exit(0)
}); |
Output:
Example 2:
Javascript
// Node.js program to demonstrate the // request.getHeader() APi // 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' ]);
// getting header
// by using getHeader() api
const v = req.getHeader( 'Cookie' );
// display the result
console.log( "header :- " + v)
process.exit(0)
}); |
Output:
Reference: https://nodejs.org/dist/latest-v12.x/docs/api/http.html#http_request_getheader_name