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Node.js http2session.type Method
  • Last Updated : 02 Nov, 2020

The http2session.type is an inbuilt application programming interface of class http2session within http2 module which is used to return the type of session instance used in the peer process.

Syntax:

const http2session.type

Parameters: This method does not takes any argument as a parameter.

Return Value: This method return the type of session instance used in the peer process.

How to generate the private key and public certificate?



  1. Private key: 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-----
    

    Now save the file as private-key.pem

  2. Public certificate: 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-----
    

    Now save the file as public-cert.pem

Example 1: Filename: index.js




// Node.js program to demonstrate the
// http2session.type 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) => {
    stream.respond({
        ':status': 200,
        'content-type': 'text/plain'
    });
    stream.write('hello ');
  
    const http2session = stream.session;
  
    // Getting type of the particular session
    // by using type method
    const status = http2session.type;
  
    if (status)
        stream.end("This session is of "
            + "NGHTTP2_SESSION_CLIENT type");
    else
        stream.end("This session is of "
            + "NGHTTP2_SESSION_SERVER type");
  
    // Stopping the server by
    // using the close() method
    server.close(() => {
        console.log("server localSettings");
    })
});
  
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', (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 localSettings");
    })
});

Run the index.js file using the following command:

node index.js

Output:

status : 200
Received: hello
Received: This session is of NGHTTP2_SESSION_SERVER type
client localSettings
server localSettings

Example 2: Filename: index.js




// Node.js program to demonstrate the
// http2session.type 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) => {
  
    // Getting session object
    // by using session method
    const http2session = stream.session;
  
    // Getting state associated with this
    // session by using state method
    const status = http2session.state;
  
    stream.end("numeric id of recent data : " 
            + status.lastProcStreamID);
  
    // 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('data', (data) => {
    console.log('Received: %s ',
        data.toString().replace(/(\n)/gm, ""));
});
  
req.on('end', () => {
    client.close(() => {
        console.log("client destroyed");
    })
});
  
const http2session = req.session;
  
// Getting type aof the particular session
// by using type method
const status = http2session.type;
  
if (status)
    console.log("This session is of "
        + "NGHTTP2_SESSION_CLIENT type");
else
    console.log("This session is of "
        + "NGHTTP2_SESSION_SERVER type");

Run the index.js file using the following command:

node index.js

Output:

This session is of NGHTTP2_SESSION_CLIENT type
Received: numeric id of recent data : 1
client destroyed
server destroyed

Reference: https://nodejs.org/dist/latest-v12.x/docs/api/http2.html#http2_http2session_type

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