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Server Side Basics
- 1. SERVER SIDE BASICS Keith Swallow PDX Web & Design Meetup
- 2. TONIGHT • DNS: What Does 72.26.203.99 Mean? • HTTP: Its Just Text! • MVC: The Way of Web Apps • Recipes: Login and Email • Scaling: More, Smaller, Faster
- 3. DNS What Do Those Numbers Mean?
- 4. DOMAIN NAMING SERVICE • Computers are bad with names, prefer numbers • People are bad with numbers, prefer names • DNS bridges the gap
- 5. • You type http://xkcd.com in a browser • Your computer asks its local DNS server where xkcd.com is • That DNS server asks an authoritative server • Then relays the IP address (72.26.203.99)
- 6. DOMAIN NAMING SERVICE where is xkcd.com? your computer DNS server
- 7. DOMAIN NAMING SERVICE where is xkcd.com? where is xkcd.com? your computer DNS server authoritative DNS server
- 8. DOMAIN NAMING SERVICE where is xkcd.com? 72.26.203.99 your computer DNS server authoritative DNS server
- 9. DOMAIN NAMING SERVICE 72.26.203.99 72.26.203.99 your computer DNS server authoritative DNS server
- 10. DOMAIN NAMING SERVICE 72.26.203.99 72.26.203.99 your computer DNS server authoritative DNS server xkcd.com 72.26.203.99
- 12. HYPER TEXT TRANSFER PROTOCOL • Request • Ask for data • Response • Read response headers • Act on response body • Repeat
- 13. HTTP VERBS • GET • POST • PUT • DELETE
- 14. HTTP REQUEST Host: xkcd.com User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2.3) Gecko/ 20100401 Firefox/3.6.3 Accept: text/html,application/xhtml+xml,application/xml; Accept-Language: en-us,en; Accept-Encoding: gzip,deflate Accept-Charset: ISO-8859-1,utf-8; Keep-Alive: 115
- 15. HTTP RESPONSE HEADERS Vary: Accept-Encoding Last-Modified: Mon, 21 Feb 2011 05:00:08 GMT Etag: "2060469139" Content-Type: text/html Accept-Ranges: bytes Date: Tue, 22 Feb 2011 18:28:44 GMT Server: lighttpd/1.4.19 Content-Length: 2799
- 16. HTTP RESPONSE BODY <?xml version="1.0" encoding="utf-8" ?> <?xml-stylesheet href="http://imgs.xkcd.com/s/c40a9f8.css" type="text/css" media="screen" ?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>xkcd: Computer Problems</title> <link rel="stylesheet" type="text/css" href="http://imgs.xkcd.com/s/c40a9f8.css" media="screen" title="Default" /> <link rel="alternate" type="application/atom+xml" title="Atom 1.0" href="/atom.xml" /> <link rel="alternate" type="application/rss+xml" title="RSS 2.0" href="/rss.xml" />
- 18. MVC The Way of Web Apps
- 19. MODEL-VIEW-CONTROLLER • Controller • Handles the request and sends it to the correct model(s) • Model • Business logic and abstract representation of domain entities • View • Display of information contained in models
- 20. REQUEST FLOW Browser Controller View Model
- 21. RAILS MVC & RECIPES • Logon • Email
- 23. SCALING • Horizontal Scaling (More) • Throw more hardware at the problem • Vertical Scaling (Smaller) • Cut the problem into smaller chunks • Caching (Faster) • Increase response speed, reduce load
- 24. HORIZONTAL SCALING • Add more hardware to deliver the same content your computer xkcd.com web
- 25. HORIZONTAL SCALING • Add more hardware to deliver the same content your computer xkcd.com web images
- 26. HORIZONTAL SCALING • Add more hardware to deliver the same content your computer xkcd.com web images database
- 27. HORIZONTAL SCALING • Add more hardware to deliver the same content your computer xkcd.com web images database
- 28. HORIZONTAL SCALING • Add more hardware to deliver the same content your computer xkcd.com web images database
- 29. VERTICAL SCALING xkcd.com web images database your computer • Break the system into specialized parts
- 30. VERTICAL SCALING xkcd.com web images your computer database • Break the system into specialized parts
- 31. VERTICAL SCALING xkcd.com web images your computer • Break the system into specialized parts database
- 32. VERTICAL SCALING xkcd.com cache your computer web • Respond quickly to the images database request
- 33. QUESTIONS? Speak now or forever hold your peace
- 34. THANK YOU! Keith Swallow keithcelt.com twitter.com/keithcelt keithcelt@gmail.com
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