Node.js Http2Session stream Event

The ‘stream’ Event in http2 server is emitted when a new Http2Stream is created.

Syntax:

Event: 'stream'

Parameters: This event does not accept any argument as a parameter.

Return Value: This event returns nothing but a callback function.

How to generate private key and public certificate?

private key:

Step – 1: Open notepad and copy paste the following key

-----BEGIN RSA PRIVATE KEY-----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-----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-----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-----END CERTIFICATE-----

Step – 2: Save as public-cert.pem

Example 1: Filename: index.js

Javascript

// Node.js program to demonstrate the
// stream Event API
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);

// Emitting stream event
server.on('stream', (stream, requestHeaders) => {
    stream.respond({
        ':status': 200,
        'content-type': 'text/plain'
    });

    stream.write('hello ');

    // Checking if header is sent or not
    // by using close() method
    const status = stream.headersSent;

    if (status)
        stream.end("header is sent");
    else
        stream.end("header is not sent");

    // 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', (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

Javascript

// Node.js program to demonstrate the
// stream Event API
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);

// Emitting stream event
server.on('stream', (stream, requestHeaders) => {

    // Checking if header is sent or not
    // by using close() method
    const status = stream.headersSent;

    if (status)
        stream.end("header is sent");
    else
        stream.end("header is not sent");

    // 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', (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: header is not sent
client destroyed
server destroyed

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_event_stream