var path = require('path');
var fs = require('fs');
var pino = require('pino');
var restify = require('../../lib');

var srv = restify.createServer({
    http2: {
        cert: fs.readFileSync(path.join(__dirname, './keys/http2-cert.pem')),
        key: fs.readFileSync(path.join(__dirname, './keys/http2-key.pem')),
        ca: fs.readFileSync(path.join(__dirname, 'keys/http2-csr.pem')),
        allowHTTP1: true //allow incoming connections that do not support HTTP/2 to be downgraded to HTTP/1.x
    }
});

srv.get('/', function(req, res, next) {
    res.send({ hello: 'world' });
    next();
});

srv.on(
    'after',
    restify.plugins.auditLogger({
        event: 'after',
        body: true,
        log: pino(
            { name: 'audit' },
            process.stdout
        )
    })
);

srv.listen(8080, function() {
    console.log('ready on %s', srv.url);
});

var path = require('path');
var fs = require('fs');
var pino = require('pino');
var restify = require('../../lib');

var srv = restify.createServer({
    http2: {
        cert: fs.readFileSync(path.join(__dirname, './keys/http2-cert.pem')),
        key: fs.readFileSync(path.join(__dirname, './keys/http2-key.pem')),
        ca: fs.readFileSync(path.join(__dirname, 'keys/http2-csr.pem'))
    }
});

srv.get('/', function(req, res, next) {
    res.send({ hello: 'world' });
    next();
});

srv.on(
    'after',
    restify.plugins.auditLogger({
        event: 'after',
        body: true,
        log: pino(
            { name: 'audit' },
            process.stdout
        )
    })
);

srv.listen(8080, function() {
    console.log('ready on %s', srv.url);
});

--- 
+++ 
@@ -7,7 +7,8 @@
     http2: {
         cert: fs.readFileSync(path.join(__dirname, './keys/http2-cert.pem')),
         key: fs.readFileSync(path.join(__dirname, './keys/http2-key.pem')),
-        ca: fs.readFileSync(path.join(__dirname, 'keys/http2-csr.pem'))
+        ca: fs.readFileSync(path.join(__dirname, 'keys/http2-csr.pem')),
+        allowHTTP1: true //allow incoming connections that do not support HTTP/2 to be downgraded to HTTP/1.x
     }
 });
 
Update example to allow downgrading to http1