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Impromptu Orchestra
HTTP/2 and Reactive Streams
berwout.devriesrobles@infosupport.com
Introductions
Berwout de Vries Robles
Info Support
Professional Development Center
Topics
• Short history of HTTP
• Problems and past solutions
• HTTP/2 Usage
• Reactive Streams
• Spring Reactor
• Intro demo
• Music performance
• HTTP/3
Short history of HTTP
HTTP/0.9
• 1990~1991
• One line protocol
• Designed for HTML documents
• Request response
GET /about/
<html><body><h1>It works!</h1></body></html>
Request
Response
HTTP/1.0
• 1991~1997
• Browsers emerge
• Many differing implementations
• HTTP-WG is formed
HTTP/1.0 Features of note
• Request and response headers
• Response status
• Content types
source: ytimg
HTTP/1.0 Request
Host: http://twotruenoobs.com
Accept: image/gif, image/jpeg, */*
User-Agent: Mozzila/3.01
(Blank line)
[------Optional request body----------]
HTTP
Verb
Uniform Resource Identifier
(URI)
Version
Headers
Any
data
HTTP/1.0 Response
HTTP/1.0 200 OK
Date: Sun, 15 Jul 2018 20:56:53 GMT
Content-Length: 44
Content-Type: text/html
(Blank line)
<html><body><h1>It works!</h1></body></html>
Status
line
Headers
Any
data
HTTP/1.1
• 1995~current
• First formal standard by IETF
• Publications in 1997, 1999 and 2014
HTTP/1.1 Features of note
• Keepalive (default)
• Chunked encoding
• Cookies
Okay, what is the problem?
Problems
• Extreme growth
• Responsiveness
• High volumes
• Server sending
Responsiveness solutions
• Polling
• Long-polling
• Websockets
• Server sent events
HTTP/2.0
• 2012~current
• Publication in 2015
• Based on SPDY by Google
• Binary
HTTP/2.0 Features of note
• Bidirectional
• Header compression
• Server push
• Multiplexing
source: Nginx
Great! how do we use it?
Using HTTP/2.0
• Implemented in webservers and browsers.
• Web-applications don’t need to change!
• All major browsers
• All major webservers
Server push
• Push is browser caches and webservers, not
applications!
• Defined using Link header
Link: </assets/css/screen.css>; rel=preload; as=style
source: GoLang blog
A new life for Server Sent Events
• Multiplexing SSE
• Multiple streams, one connection
• No head of line blocking
source: Nginx
Reactive streams
Responsive
Resilient
Elastic
Message driven
Backpressure
Flow control
Asynchronous
Composable
Main Goal:
“To govern the exchange of stream data across an
asynchronous boundary.”
source: reactive-streams.org
source: OVHO
• Composable
• Flow control
• Message/Music driven
• Resilient
• Responsive
• Elastic
• Asynchronous
• Backpressure
Simplified
• There are publishers
• There are subscribers
• Asynchronous streams in the middle
• Reactive streams is a collection of interfaces
source: Tech.io
Spring 5 and Reactor
Reactor
• Flux = publisher
• Mono = publisher
• Processor = both
• Subscriber = subscriber
Demo time
Time to make some music!
• Turn on your sound (media)
• Switch to 4G internet
• Navigate to
www.twotruenoobs.com
• Username: ${name}-${section}
for example: berwout-A
• Roomname: jspring
• Hit Join!
Difficulties
• Naming is hard
• Error handling on disconnects
• Composability quickly becomes complexity
Do we still need websockets?
• Large amount of support
• Client sending a lot of individual requests
• Large amounts of bi-directional data
• Real-time
What does HTTP/3 bring?
• TCP Limitations
• QUIC
• Multiple protocols
• TCP over UDP
source: Nginx
Setup
source: Medium
source: Rumbia
source: Traefik
source: Sounds electric
source: IconFinder
Please rate my talk ☺
berwout.devriesrobles@infosupport.com

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Impromptu orchestra: HTTP/2 and Reactive Streams