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Building better clients

Avatar for Ben Longden Ben Longden
September 11, 2014
Technology
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Building better clients

Avatar for Ben Longden

Ben Longden

September 11, 2014
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Transcript

  1. BUILDING BETTER CLIENTS

  2. BEN LONGDEN CTO Inviqa Enterprise open source

  3. @BLONGDEN

  4. There are two types of client

  5. MACHINE DRIVEN

  6. HUMAN DRIVEN

  7. WHAT'S THE PROBLEM?

  8. We're getting quite good better at building RESTful API's on

    the server side.

  9. But what about our clients?

  10. Do they allow the API to change?

  11. Consider the web browser.

  12. What would the browser do? — Brian Sletten

  13. Supports the most common media types.

  14. application/x-shockwave-flash

  15. Versioning

  16. HTML

  17. We're not building a web browser

  18. But we can be inspired

  19. CONTENT NEGOTIATION (CONNEG)

  20. Send what your client will accept

  21. Accept: application/hal+json, text/plain

  22. Check what the server sends back

  23. Content-Type: application/hal+json

  24. Allow clients to support new media types when they become

    available

  25. Accept: application/hal+json, application/ vnd.error+json, text/plain;q=0.9

  26. USE AN HTTP CLIENT

  27. CACHEING

  28. URLS

  29. Remember that any GET request can be bookmarked by a

    client

  30. But also that it could result in a redirect

  31. GUZZLE ▸ Cacheing ▸ Logging ▸ Oauth

  32. HYPERMEDIA CONSTRAINT

  33. Hypermedia is defined by the presence of application control information

    embedded within, or as a layer above, the presentation of information — Roy Fielding

  34. LINK RELATIONS POSSIBLE STATES

  35. CONTEXT

  36. { "_links": { "self": { "href": "/comment/3864362" } }, "content":

    "lol" }

  37. { "_links": { "edit": { "href": "/comment/3864362" }, "self": {

    "href": "/comment/3864362" } }, "content": "lol" }
  38. None

  39. CLIENT CAN EVOLVE INDEPENDENTLY

  40. None

  41. Futureproof?

  42. DESIGN OF EVERYDAY THINGS

  43. Form a goal

  44. Intention to act

  45. Sequence of actions

  46. Execution of the sequence of action

  47. Perceive the state of the world

  48. Interpret the perception

  49. Evaluate the outcome

  50. None

  51. Why am I talking about this?

  52. A hypermedia client works in much the same way

  53. Let the server be in control

  54. Use content negotiation to allow clients to evolve

  55. Use an HTTP client and turn on cacheing

  56. Drive human interaction through hypermedia controls

  57. None

  58. QUESTIONS! (or ask me at the bar later)