The rise of HTTP/2

NYC - Oct, 2017

Daniela Matos de Carvalho

@sericaia

about me

I code at

{

}

I organize

I like

HTTP

0.9 1.0 1.1

HTTP/1.1 Pipelining

(image source: High Performance Browser Networking - Ilya Gregorik)

HTTP/1.1

head-of-line (HOL) blocking

Why a new [improvement of the] protocol?

because...

#peopleFirst

enter LATENCY

(image source: High Performance Browser Networking - Ilya Gregorik)

These were results from "SPDY" investigation

SPDY is HTTP/2 father

enter HTTP/2

with music

musicians are organised by instruments

different STREAMS

musicians are organised by instruments

different STREAMS

creating MESSAGES

musicians are organised by instruments

{sound}

musicians are organised by instruments

different STREAMS

creating MESSAGES

different streams

can be MULTIPLEXED

there is

STREAM

PRIORITIZATION,

when only

saxophones play

saxophonists might play the whole song,

or just a part of it

DATA > DATA > DATA > ... > DATA

[Binary]

and they also announce that

they are going to play

(HEADER)

DATA > DATA > ... > DATA

our heads can COMPRESS what they're going to do before starting

HEADER COMPRESSION

in the beginning a brochure or a quick presentation is PUSHED to the attendees

sound
enthusiasm

applause

mood

attendees

orchestra

FLOW CONTROL

conductor

room

organization is key

in HTTP/2

in a orchestra

...give me live examples!

#WiresharkDemo

https://nodejs.org/

But how to use HTTP/2 with Node.js?

    node --expose-http2 index.js

https://nodejs.org/api/http2.html

simple secure HTTP/2 server

    
    const http2 = require('http2'),
    fs = require('fs');
    
    const options = {
      key: fs.readFileSync('keys/server.key'),
      cert: fs.readFileSync('keys/server.crt')
    };
    
    const server = http2.createSecureServer(options);
    server.on('stream', (stream, requestHeaders) => {
      // ...
    });
    
    server.listen(3000);

https://github.com/sericaia/http2-examples-empireconf

... but, I use express/hapi

server push example

    const { HTTP2_HEADER_PATH } = http2.constants;
    
    const pushAsset = (stream, file) => {
      const filePath = path.join(__dirname, file.filePath);
      stream.pushStream({ [HTTP2_HEADER_PATH]: file.path }, (pushStream) => {
        pushStream.respondWithFile(filePath, file.headers);
      });
    }
    
    const onRequestHandler = (req, res) => {
      const currentUrl = url.parse(req.url);
      
      // ...
      if (currentUrl.pathname === '/') {
        const cssFile = {
          path: '/style.css',
          filePath: './style.css',
          headers: {
            'content-type': 'text/css'
          }
        };
        pushAsset(res.stream, cssFile);
    
        // ...
      }
    }

server push is cool, but...

what if we add Service Workers?

Learnings

credentialised requests are important

HTTPS, please

Learnings

Local

Remote

@OfflineCamp - Oregon, Nov 10-13

OMG, HTTP/2 is powerful

Wrapping up

The rise of HTTP/2

NYC - Oct, 2017

Daniela Matos de Carvalho

@sericaia