hapi with HTTP/2 server push

push-me.js

document.write('i was pushed!');

server.js

'use strict';

const Fs = require('fs');
const Path = require('path');
const Stream = require('stream');
const Hapi = require('hapi');
const Inert = require('inert');
const Http2 = require('http2');

const internals = {};

const listener = Http2.createServer({
    key: '-----BEGIN RSA PRIVATE KEY-----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\nV/ZWiegVB/WY7H0BkCekuq5bHwjgtJTpvHGqQ9YD7RhE8RSYOhdQ/Q==\n-----END RSA PRIVATE KEY-----\n',
    cert: '-----BEGIN CERTIFICATE-----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\n3J5DTjAU55deBQ==\n-----END CERTIFICATE-----\n'
});

const server = new Hapi.Server();
server.connection({ listener, tls: true, port: process.env.PORT || 4000 });

server.register(Inert, (err) => {

    if (err) {
        throw err;
    }

    server.route({
        method: 'get',
        path: '/',
        handler: (request, reply) => {

            const { res } = request.raw;

            var push = res.push('/push-me.js');

            server.inject({
                method: 'get',
                url: '/push-me.js',
                allowInternals: true
            }, (pushRes) => {

                const headers = Object.assign({}, pushRes.headers);
                internals.deprecatedHeaders.forEach((deprecated) => delete headers[deprecated]);

                push.writeHead(pushRes.statusCode, headers);

                const bufferStream = new Stream.PassThrough();
                bufferStream.end(pushRes.rawPayload);
                bufferStream.pipe(push);

                reply('<script src="/push-me.js"></script> ko!');
            });
        }
    });

    server.route({
        method: 'get',
        path: '/push-me.js',
        handler: { file: { path: Path.join(__dirname, '/push-me.js') } },
        config: { isInternal: true }
    });

    server.start((err) => {

        if (err) {
            throw err;
        }

        console.log(`Started at ${server.info.uri}`);
    });
});

internals.deprecatedHeaders = [
    'connection',
    'host',
    'keep-alive',
    'proxy-connection',
    'transfer-encoding',
    'upgrade'
];

For chrome demo/debug see,
chrome://net-internals/#http2
https://bugs.chromium.org/p/chromium/issues/attachment?aid=169362&inline=1
https://bugs.chromium.org/p/chromium/issues/detail?id=464501

Curiosities around caching and server-push,
https://www.shimmercat.com/en/blog/articles/cache-digests/