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HTTP Caching Basics

Rafaël Blais Masson
December 18, 2012
Programming
9
370

HTTP Caching Basics

Talk given at OpenCode Québec on December 18th, 2012. Supporting code is here: http://github.com/rafBM/opencode-httpcaching

Rafaël Blais Masson

December 18, 2012
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Transcript

  1. For fun and profit. HTTP Caching

  2. HTT– WAT?

  3. GET /index.html HTTP/1.1 Host: heeeeeeeey.com Accept: text/html HTTP/1.1 200 OK

    Content-Type: text/html Content-Length: 3513 <!DOCTYPE html> <html> <head> ...

  4. GET /index.html HTTP/1.1 Host: heeeeeeeey.com Accept: text/html HTTP/1.1 200 OK

    Content-Type: text/html Content-Length: 3513 <!DOCTYPE html> <html> <head> ...

  5. GET /index.html HTTP/1.1 Host: heeeeeeeey.com Accept: text/html Accept-Encoding: gzip HTTP/1.1

    200 OK Content-Type: text/html Content-Length: 1670 Content-Encoding: gzip ?W?o?6???7???-???^??tK?|h?m?T ID?????7???????9?fS,?h~xs?,??:V?2`v_??0њ?3G?A?x ...

  6. GET /flaberbeezle.twizz HTTP/1.1 Host: heeeeeeeey.com Accept: text/html HTTP/1.1 404 Not

    Found Content-Type: text/html Content-Length: 2475 <!DOCTYPE html> <html> <head> ...

  7. GET /index.html HTTP/1.1 Host: heeeeeeeey.com Accept: text/html HTTP/1.1 301 Moved

    Permanently Location: http://www.heeeeeeeey.com/index.html

  8. CACHING MOTHER*** DO YOU SPEAK IT?

  9. Validation

  10. GET /index.html HTTP/1.1 Host: heeeeeeeey.com Accept: text/html

  11. GET /index.html HTTP/1.1 Host: heeeeeeeey.com Accept: text/html HTTP/1.1 200 OK

    Content-Type: text/html Content-Length: 3513 <!DOCTYPE html> <html> ...

  12. GET /index.html HTTP/1.1 Host: heeeeeeeey.com Accept: text/html

  13. GET /index.html HTTP/1.1 Host: heeeeeeeey.com Accept: text/html HTTP/1.1 200 OK

    Content-Type: text/html Content-Length: 3513 <!DOCTYPE html> <html> ...

  14. GET /index.html HTTP/1.1 Host: heeeeeeeey.com Accept: text/html HTTP/1.1 200 OK

    Content-Type: text/html Content-Length: 3513 Last-Modified: Tue, 18 Dec 2012 12:53:00 GMT <!DOCTYPE html> <html> ...

  15. GET /index.html HTTP/1.1 Host: heeeeeeeey.com Accept: text/html

  16. GET /index.html HTTP/1.1 Host: heeeeeeeey.com Accept: text/html If-Modified-Since: Tue, 18

    Dec 2012 12:53:00 GMT

  17. GET /index.html HTTP/1.1 Host: heeeeeeeey.com Accept: text/html If-Modified-Since: Tue, 18

    Dec 2012 12:53:00 GMT HTTP/1.1 304 Not Modified

  18. GET /index.html HTTP/1.1 Host: heeeeeeeey.com Accept: text/html If-Modified-Since: Tue, 18

    Dec 2012 12:53:00 GMT

  19. GET /index.html HTTP/1.1 Host: heeeeeeeey.com Accept: text/html If-Modified-Since: Tue, 18

    Dec 2012 12:53:00 GMT HTTP/1.1 200 OK Content-Type: text/html Content-Length: 3513 Last-Modified: Tue, 19 Dec 2012 14:25:00 GMT <!DOCTYPE html> <html> ...

  20. GET /index.html HTTP/1.1 Host: heeeeeeeey.com Accept: text/html If-Modified-Since: Tue, 18

    Dec 2012 12:53:00 GMT

  21. GET /index.html HTTP/1.1 Host: heeeeeeeey.com Accept: text/html If-Modified-Since: Tue, 19

    Dec 2012 14:25:00 GMT

  22. GET /index.html HTTP/1.1 Host: heeeeeeeey.com Accept: text/html If-Modified-Since: Tue, 19

    Dec 2012 14:25:00 GMT HTTP/1.1 304 Not Modified

  23. GET /index.html HTTP/1.1 Host: heeeeeeeey.com Accept: text/html

  24. GET /index.html HTTP/1.1 Host: heeeeeeeey.com Accept: text/html HTTP/1.1 200 OK

    Content-Type: text/html Content-Length: 3513 <!DOCTYPE html> <html> ...

  25. GET /index.html HTTP/1.1 Host: heeeeeeeey.com Accept: text/html HTTP/1.1 200 OK

    Content-Type: text/html Content-Length: 3513 ETag: 165d96c6baae07f807115f00ca878431 <!DOCTYPE html> <html> ...

  26. GET /index.html HTTP/1.1 Host: heeeeeeeey.com Accept: text/html

  27. GET /index.html HTTP/1.1 Host: heeeeeeeey.com Accept: text/html If-None-Match: 165d96c6baae07f807115f00ca878431

  28. GET /index.html HTTP/1.1 Host: heeeeeeeey.com Accept: text/html If-None-Match: 165d96c6baae07f807115f00ca878431 HTTP/1.1

    304 Not Modified

  29. GET /index.html HTTP/1.1 Host: heeeeeeeey.com Accept: text/html If-None-Match: 165d96c6baae07f807115f00ca878431

  30. GET /index.html HTTP/1.1 Host: heeeeeeeey.com Accept: text/html If-None-Match: 165d96c6baae07f807115f00ca878431 HTTP/1.1

    200 OK Content-Type: text/html Content-Length: 3513 ETag: e075d8ff00c11543a876a96c8a07116b <!DOCTYPE html> <html> ...

  31. GET /index.html HTTP/1.1 Host: heeeeeeeey.com Accept: text/html If-None-Match: 165d96c6baae07f807115f00ca878431

  32. GET /index.html HTTP/1.1 Host: heeeeeeeey.com Accept: text/html If-None-Match: e075d8ff00c11543a876a96c8a07116b

  33. GET /index.html HTTP/1.1 Host: heeeeeeeey.com Accept: text/html If-None-Match: e075d8ff00c11543a876a96c8a07116b HTTP/1.1

    304 Not Modified

  34. Expiration

  35. GET /index.html HTTP/1.1 Host: heeeeeeeey.com Accept: text/html

  36. GET /index.html HTTP/1.1 Host: heeeeeeeey.com Accept: text/html HTTP/1.1 200 OK

    Content-Type: text/html Content-Length: 3513 <!DOCTYPE html> <html> ...

  37. GET /index.html HTTP/1.1 Host: heeeeeeeey.com Accept: text/html HTTP/1.1 200 OK

    Content-Type: text/html Content-Length: 3513 Cache-Control: max-age=3600 <!DOCTYPE html> <html> ...

  38. GET /index.html HTTP/1.1 Host: heeeeeeeey.com Accept: text/html

  39. None

  40. GET /index.html HTTP/1.1 Host: heeeeeeeey.com Accept: text/html

  41. GET /index.html HTTP/1.1 Host: heeeeeeeey.com Accept: text/html HTTP/1.1 200 OK

    Content-Type: text/html Content-Length: 3513 Cache-Control: max-age=3600 <!DOCTYPE html> <html> ...
  42. None

  43. heliom.ca rafBM