The Http2ServerResponse.getHeaders() is an inbuilt application programming interface of class Http2ServerResponse within the http2 module which is used to return a shallow copy of the current outgoing headers.
Syntax:
response.getHeaders()
Parameters: This method does not accept any arguments as a parameter.
Return Value: This method returns a shallow copy of the current outgoing headers.
How to generate a Private key and Public certificate?
1. Filename: Private key
Open notepad and copy-paste the following key and save the file as private-key.pem
-----BEGIN RSA PRIVATE KEY----- MIICXQIBAAKBgQC38R9wXcUbhOd44FavgmE5R3K4JeYOHLnI7dUq1B8/Gv7l3SOg JKef/m9gM1KvUx951mapXGtcWgwB08J3vUE2YOZ4tWJArrVZES0BI/RmFAyhQFP5 HcWl3LSM9LRihP98F33oIkKaCxA5LxOrkgpV4HrUzIKTABDYah7RPex1WQIDAQAB AoGBAIXR71xxa9gUfc5L7+TqBs+EMmrUb6Vusp8CoGXzQvRHMJCMrMFySV0131Nu o0YYRDsAh1nJefYLMNcXd1BjqI+qY8IeRsxaY+9CB2KKGVVDO2uLdurdC2ZdlWXT Vwr3dDoyR0trnXJMmH2ijTeO6bush8HuXxvxJBjvEllM5QYxAkEA3jwny9JP+RFu 0rkqPBe/wi5pXpPl7PUtdNAGrh6S5958wUoR4f9bvwmTBv1nQzExKWu4EIp+7vjJ fBeRZhnBvQJBANPjjge8418PS9zAFyKlITq6cxmM4gOWeveQZwXVNvav0NH+OKdQ sZnnDiG26JWmnD/B8Audu97LcxjxcWI8Jc0CQEYA5PhLU229lA9EzI0JXhoozIBC TlcKFDuLm88VSmlHqDyqvF9YNOpEdc/p2rFLuZS2ndB4D+vu6mjwc5iZ3HECQCxy GBHRclQ3Ti9w76lpv+2kvI4IekRMZWDWnnWfwta+DGxwCgw2pfpleBZkWqdBepb5 JFQbcxQJ0wvRYXo8qaUCQQCgTvWswBj6OTP7LTvBlU1teAN2Lnrk/N5AYHZIXW6m nUG9lYvH7DztWDTioXMrruPF7bdXfZOVJD8t0I4OUzvC -----END RSA PRIVATE KEY-----
2. Filename: Public certificate
Open notepad and copy-paste the following key and save the file as public-cert.pem
-----BEGIN CERTIFICATE----- MIICfzCCAegCCQDxxeXw914Y2DANBgkqhkiG9w0BAQsFADCBgzELMAkGA1UEBhMC SU4xEzARBgNVBAgMCldlc3RiZW5nYWwxEDAOBgNVBAcMB0tvbGthdGExFDASBgNV BAoMC1BhbmNvLCBJbmMuMRUwEwYDVQQDDAxSb2hpdCBQcmFzYWQxIDAeBgkqhkiG 9w0BCQEWEXJvZm9mb2ZAZ21haWwuY29tMB4XDTIwMDkwOTA1NTExN1oXDTIwMTAw OTA1NTExN1owgYMxCzAJBgNVBAYTAklOMRMwEQYDVQQIDApXZXN0YmVuZ2FsMRAw DgYDVQQHDAdLb2xrYXRhMRQwEgYDVQQKDAtQYW5jbywgSW5jLjEVMBMGA1UEAwwM Um9oaXQgUHJhc2FkMSAwHgYJKoZIhvcNAQkBFhFyb2ZvZm9mQGdtYWlsLmNvbTCB nzANBgkqhkiG9w0BAQEFAAOBjQAwgYkCgYEAt/EfcF3FG4TneOBWr4JhOUdyuCXm Dhy5yO3VKtQfPxr+5d0joCSnn/5vYDNSr1MfedZmqVxrXFoMAdPCd71BNmDmeLVi QK61WREtASP0ZhQMoUBT+R3Fpdy0jPS0YoT/fBd96CJCmgsQOS8Tq5IKVeB61MyC kwAQ2Goe0T3sdVkCAwEAATANBgkqhkiG9w0BAQsFAAOBgQATe6ixdAjoV7BSHgRX bXM2+IZLq8kq3s7ck0EZrRVhsivutcaZwDXRCCinB+OlPedbzXwNZGvVX0nwPYHG BfiXwdiuZeVJ88ni6Fm6RhoPtu2QF1UExfBvSXuMBgR+evp+e3QadNpGx6Ppl1aC hWF6W2H9+MAlU7yvtmCQQuZmfQ== -----END CERTIFICATE-----
Example 1: Filename: index.js
// Node.js program to demonstrate the // Http2ServerResponse.getHeaders() method const http2 = require( 'http2' );
const fs = require( 'fs' );
// Private key and public certificate for access const options = { key: fs.readFileSync( 'private-key.pem' ),
cert: fs.readFileSync( 'public-cert.pem' ),
}; // Request and response handler const http2Handlers = (request, response) => { // Setting new header
response.setHeader(
'Content-Type' ,
'hello world; charset=utf-8'
);
// Getting header's object
// by using getHeaders() method
const value = response.getHeaders()
// Display the header
console.log(value);
}; // Creating and initializing server // by using http2.createServer() method const server = http2.createServer( options, http2Handlers);
server.on('stream ', (stream, requestheader) => {
stream.write(' hello ');
// Getting all information of this http2stream
// object by using state method
const status = stream.state;
stream.end("priority weight : " + status.weight);
// Stopping the server
// by using the close() method
server.close(() => {
console.log("server destroyed");
})
}); server.listen(8000); // Creating and initializing client // by using tls.connect() method const client = http2.connect( ' http: //localhost:8000');
const req = client.request({ ':method ': ' GET ', ' :path ': ' / '});
req.on(' response ', (responsesocket) => {
console.log("status : "
+ responsesocket[":status"]);
}); req.on(' data ', (data) => {
console.log(' Received: %s ',
data.toString().replace(/(\n)/gm,""));
}); req.on(' end', () => {
client.close(() => {
console.log( "client destroyed" );
})
}); |
Run the index.js file using the following command:
node index.js
Output:
{ 'content-type': 'hello world; charset=utf-8' } status : 200 Received: hello Received: priority weight : 16 client destroyed server destroyed
Example 2: Filename: index.js
// Node.js program to demonstrate the // Http2ServerResponse.getHeaders() method const http2 = require( 'http2' );
const fs = require( 'fs' );
// Private key and public certificate for access const options = { key: fs.readFileSync( 'private-key.pem' ),
cert: fs.readFileSync( 'public-cert.pem' ),
}; // Request and response handler const http2Handlers = (request, response) => { // Setting new header
response.setHeader( 'Foo' , 'bar' );
response.setHeader(
'Set-Cookie' , [ 'foo=bar' , 'bar=baz' ]);
// Getting header's object
// by using getHeaders() method
const value = response.getHeaders()
// Display the header
console.log(value);
}; // Creating and initializing server // by using http2.createServer() method const server = http2.createServer( options, http2Handlers);
server.on('stream ', (stream, requestHeaders) => {
// Getting all information of this http2stream
// object by using state method
const status = stream.state;
stream.end("The sum weight of all Http2Stream : "
+ status.sumDependencyWeight);
// Stopping the server
// by using the close() method
server.close(() => {
console.log("server destroyed");
})
}); server.listen(8000); // Creating and initializing client // by using tls.connect() method const client = http2.connect(' http: //localhost:8000');
const req = client.request({ ':method ': ' GET ',
' :path ': ' /www.geeksforgeeks.org ' });
req.on(' data ', (data) => {
console.log(' Received: %s ',
data.toString().replace(/(\n)/gm,""));
}); req.on(' end', () => {
client.close(() => {
console.log( "client destroyed" );
})
}); |
Run the index.js file using the following command:
node index.js
Output:
{ foo: 'bar', 'set-cookie': [ 'foo=bar', 'bar=baz' ] } Received: The sum weight of all Http2Stream : 0 client destroyed server destroyed
Reference: https://nodejs.org/dist/latest-v12.x/docs/api/http2.html#http2_response_getheaders