The http2stream.respond() is an inbuilt application programming interface of class Http2Stream within http2 module which is used to sent the response header of the particular stream to its client.
Syntax:
const http2stream.respond([headers[, options]])
Parameters: This method takes the response header as its parameter.
Return Value: This method does not return any value.
How to generate private key and public certificate
private key
Step – 1: Open notepad and copy paste the following key
-----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-----
Step – 2: Save as private-key.pem
public certificate
Step – 1: Open notepad and copy paste the following key
-----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-----
Step – 2: Save as public-cert.pem
Example 1: Filename: index.js
// Node.js program to demonstrate the // Http2Stream.respond() 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' ),
}; // Creating and initializing server // by using http2.createServer() method const server = http2.createServer(options); server.on( 'stream' , (stream, requestHeaders) => {
// Setting response header to client
// by using respond() method
stream.respond({
':status' : 200,
'content-type' : 'text/plain'
});
stream.write( 'hello ' );
// Checking if header is sent or not
// by using pushAllowed method
const status = stream.pushAllowed;
if (status)
stream.end( "push stream is accepted" );
else
stream.end( "push stream is not accepted" );
// 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( const req = client.request({ ':method' : 'GET' ,
':path' : '/'
}); req.on( 'response' , (responseHeaders) => {
console.log( "status : "
+ responseHeaders[ ":status" ]);
}); req.on( 'data' , (data) => {
console.log( 'Received: %s ' ,
data.toString().replace(/(\n)/gm, "" ));
}); req.on( 'end' , () => {
client.close(() => {
console.log( "client destroyed" );
})
}); |
Output:
status : 200 Received: hello Received: header is sent client destroyed server destroyed
Run the index.js file using the following command:
node index.js
Example 2: Filename: index.js
// Node.js program to demonstrate the // Http2Stream.respond() 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' ),
}; // Creating and initializing server by // using http2.createServer() method const server = http2.createServer(options); server.on( 'stream' , (stream, requestHeaders) => {
// Setting response header to client
// by using respond() method
stream.respond({
':status' : 200,
'content-type' : 'text/plain'
});
// 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( const req = client.request({ ':method' : 'GET' ,
':path' : '/'
}); req.on( 'response' , (responseHeaders) => {
console.log( "status : "
+ responseHeaders[ ":status" ]);
}); |
Output:
status : 200
Run the index.js file using the following command:
node index.js
Reference: https://nodejs.org/dist/latest-v12.x/docs/api/http2.html#http2_http2stream_respond_headers_options