Scalable applications with HTTP
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Talks about the HTTP protocol and how it can be used for a service-oriented architecture. This was presented at the Internet Briefing developer conference on April 7, 2010 in Zurich, Switzerland.
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Scalable applications with HTTP
- 1. Scalable applications with HTTP Patrice Neff, co-founder Memonic patrice@memonic.com twitter.com/pneff 20100407 memonic
- 2. Memonic • Founded in 2009 • Your personal digital notebook • Easy web research • Try it out for free: www.memonic.com © memonic
- 3. About me • Web developer • Co-Founder Memonic • Previously frontend developer at local.ch • Details & Blog: patrice.ch © memonic
- 4. I’ll talk about... • Service-oriented architectures • Motivation • HTTP, the protocol • Real-world example © memonic
- 5. Glossary Performance Scalability ©Prosper973 ©Kelinz1 © memonic
- 6. Service-oriented architectures Internet Internet Frontend DB Web Server Service 1 Service 2 Service 3 © memonic
- 7. Key points • Dependencies local to service • Database • Queue • Synchronization • Try the simplest service that works Internet • Services are the new classes? Frontend Service 1 Service 2 Service 3 © memonic
- 8. Motivation • Modularity • Team separation • Clear boundaries • Easier migrations / replacements • Re-use of services • Best tool for the job • Programming language • Dependencies (Database, Queue, ...) • Scalability © memonic
- 9. Disadvantages • Complex full-picture view • Performance • Data joins ©Eddi 07 © memonic
- 10. HTTP • RFC 2616 defines HTTP 1.1 • Text protocol is debuggable • Solved problems: • Caching • Compression • Error handling • Authentication • Content negotiation • Documentation © memonic
- 11. HTTP Example GET /intl/en/about.html HTTP/1.1 Host: www.google.ch HTTP/1.1 200 OK Date: Wed, 24 Mar 2010 20:51:06 GMT Expires: -1 Cache-Control: private, max-age=0 Content-Type: text/html; charset=ISO-8859-1 Server: gws X-XSS-Protection: 0 <!doctype html>... © memonic
- 12. Caching • Cache-Control response header: • Allow or prohibit caching • Specify cache validity • ETag response header: • Client can validate it’s cache content • Avoids re-transmission of content © memonic
- 13. Caching Example GET /1/83.76.244.123 HTTP/1.1 Host: geoip Accept: application/json HTTP/1.1 200 OK Cache-Control: max-age=31536000 Expires: Fri, 25 Mar 2011 17:28:44 GMT Content-Type: application/json; charset=UTF-8 Content-MD5: a59a841c05fdddef931399ef2275f6d3 {"country_code": "CH"} © memonic
- 14. Memonic Architecture Internet geoip staticpage Frontend browser index user label storage pipeline mime screenshot html_cleanup © memonic
- 15. Links http://www.memonic.com/user/pneff/set/presentation-http-scalability or: http://mem.to/t/1Fsc © memonic
- 16. Thank you! Patrice Neff, co-founder Memonic patrice@memonic.com twitter.com/pneff 20100407 memonic