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Hypermedia In Practice - FamilySearch Developers Conference 2014

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Ryan Heaton
Ryan Heaton

An introduction to how to use Hypermedia to write effective client applications.

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Hypermedia in Practice 1 © 2013 by Intellectual Reserve, Inc. All rights reserved.
The Goal 2 © 2013 by Intellectual Reserve, Inc. All rights reserved.
The Goal Learn how to use hypermedia for better Web service APIs. 3 © 2013 by Intellectual Reserve, Inc. All rights reserved.
The Goal Learn how to use hypermedia for better Web service APIs. Better? ●More Adaptable ●More Robust ●More Maintainable ● Less Pain 4 © 2013 by Intellectual Reserve, Inc. All rights reserved.
A Review ● Web service API – A set of digital services and/or resources made accessible over a computer network. ● HTTP – Hypertext Transfer Protocol – Defines how to make requests and interpret responses.
A Review ● Resources – The units of data making up the “matter” of the API. – The “subject” of HTTP operations. ● Uniform Resource Identifier – The locator for a resource. – Includes a domain, path, query.
A Review ● Resource Representations – How resources are serialized to a stream of bytes. – Often JSON and XML. – a.k.a. “media types” or “data formats” ● See “Architecture of the World Wide Web” – http://www.w3.org/TR/webarch/
Client
WWW
API Server
Resource Store
URI
HTTP “GET /path/to/resource”
Resource HTTP “GET /path/to/resource”
“OK" Resource Representation <resource> 
 </resource> { “resource” : 
 }
These change. Frequently.
What If...
What If... ...a resource representation changes its property order? { 
 “names” : [ 
 ], “facts” : [ 
 ], “gender” : { 
 }, 
 } { 
 “gender” : { 
 }, “names” : [ 
 ], “facts” : [ 
 ], 
 }
What If... ...a resource representation adds some whitespace? {“names”:[ 
 ],“facts”: [ 
 ],“gender”:{ 
 },
} { “names” : [ 
 ], “facts” : [ 
 ], “gender” : { 
 }, 
 } <person><name>...</name ><fact>...</fact><gende r>...</gender></person> <person> <name>...</name> <fact>...</fact> <gender>...</gender> </person>
...an XML representation changes namespace prefixes? <person xmlns=”...”> <name>...</name> <fact>...</fact> <gender>...</gender> </person> <gx:person xmlns:gx=”...”> <gx:name>...</gx:name> <gx:fact>...</gx:fact> <gx:gender>...</gx:gender> </gx:person> What If...
What If... ...a caching policy changes?
What If... ...new resources become available? Available Resources ● Person ● Relationship ● Person Search ● ... Available Resources ● Person ● Relationship ● Person Search ● Records ● Record ● Record Search ● ...
What If... ...an API changes domains? https://familysearch.org/platform https://familysearch.io/platform
What If... ...a resource moves? /platform/tree/persons/12345/matches /platform/tree/persons/12345/duplicates
What If... ...subresources are included in their “parent” resource? /person/12345 Person /person/12345/notes Person Person Notes Source References /person/12345/sources /person/12345 Person + Notes + Source References
What If... ● ...property order changes? ● ...some whitespace is added? ● ...XML changes namespace prefixes? ● ...caching policy changes? ● ...new resources are available? ● ...a resource moves? ● ...subresources are included in their "parent" resource?
What If... ● ...property order changes? ● ...some whitespace is added? ● ...XML changes namespace prefixes? ● ...caching policy changes? ● ...new resources are available? ● ...a resource moves? ● ...subresources are included in their "parent" resource?
Speaks HTTP fluently. Understands the URI. Uses links to get stuff done.
...a resource representation changes its property order? <html> <head> 
 <script src=”...”></script> 
 </head> <body> 
 </body> </html> What If...
...a resource representation changes its property order? <html> <head> 
 <script src=”...”></script> 
 </head> <body> 
 </body> </html> What If... <html> <head> 
 </head> <body> 
 <script src=”...”></script> 
 </body> </html>
...a resource representation changes its property order? <html> <head> 
 <script src=”...”></script> 
 </head> <body> 
 </body> </html> What If... <html> <head> 
 </head> <body> 
 <script src=”...”></script> 
 </body> </html> HTML says... “OK”
What If... ...a resource representation changes its property order? { 
 “names” : [ 
 ], “facts” : [ 
 ], “gender” : { 
 }, 
 } { 
 “gender” : { 
 }, “names” : [ 
 ], “facts” : [ 
 ], 
 }
What If... ...a resource representation changes its property order? { 
 “names” : [ 
 ], “facts” : [ 
 ], “gender” : { 
 }, 
 } { 
 “gender” : { 
 }, “names” : [ 
 ], “facts” : [ 
 ], 
 } GEDCOM X says... “OK”
What If... ...a resource representation adds some whitespace? <html><head>
</head><body>
 </body></html>
What If... ...a resource representation adds some whitespace? <html><head>
</head><body>
 </body></html> <html> <head> 
 </head> <body> 
 </body> </html>
What If... ...a resource representation adds some whitespace? <html><head>
</head><body>
 </body></html> <html> <head> 
 </head> <body> 
 </body> </html> HTML says... “OK”
What If... ...a resource representation adds some whitespace? {“names”:[ 
 ],“facts”: [ 
 ],“gender”:{ 
 },
} { “names” : [ 
 ], “facts” : [ 
 ], “gender” : { 
 }, 
 } <person><name>...</name ><fact>...</fact><gende r>...</gender></person> <person> <name>...</name> <fact>...</fact> <gender>...</gender> </person>
What If... ...a resource representation adds some whitespace? { “names” : [ 
 ], “facts” : [ 
 ], “gender” : { 
 }, 
 } <person><name>...</name ><fact>...</fact><gende r>...</gender></person> <person> <name>...</name> <fact>...</fact> <gender>...</gender> </person> {“names”:[ 
 ],“facts”: [ 
 ],“gender”:{ 
 },
} JSON says... “OK”
What If... ...a resource representation adds some whitespace? { “names” : [ 
 ], “facts” : [ 
 ], “gender” : { 
 }, 
 } <person><name>...</name ><fact>...</fact><gende r>...</gender></person> <person> <name>...</name> <fact>...</fact> <gender>...</gender> </person> {“names”:[ 
 ],“facts”: [ 
 ],“gender”:{ 
 },
} XML says... “OK”
...an XML representation changes namespace prefixes? <person xmlns=”...”> <name>...</name> <fact>...</fact> <gender>...</gender> </person> <gx:person xmlns:gx=”...”> <gx:name>...</gx:name> <gx:fact>...</gx:fact> <gx:gender>...</gx:gender> </gx:person> What If...
...an XML representation changes namespace prefixes? <person xmlns=”...”> <name>...</name> <fact>...</fact> <gender>...</gender> </person> <gx:person xmlns:gx=”...”> <gx:name>...</gx:name> <gx:fact>...</gx:fact> <gx:gender>...</gx:gender> </gx:person> What If...XML says... “OK”
What If... ...a caching policy changes? HTTP/1.1 200 OK 
 Cache-Control: no-store 

What If... ...a caching policy changes? HTTP/1.1 200 OK 
 Cache-Control: no-store 
 HTTP/1.1 200 OK 
 Cache-Control: public, max-age=3600 ETag: 1234567890 

What If... HTTP says... “OK” ...a caching policy changes? HTTP/1.1 200 OK 
 Cache-Control: no-store 
 HTTP/1.1 200 OK 
 Cache-Control: public, max-age=3600 ETag: 1234567890 

What If... ...a caching policy changes?
What If... ...new resources become available?
What If... ...new resources become available?
What If... ...new resources become available? Available Resources ● Person ● Relationship ● Person Search ● ... Available Resources ● Person ● Relationship ● Person Search ● Records ● Record ● Record Search ● ...
What If... ...new resources become available? Available Resources ● Person ● Relationship ● Person Search ● ... Available Resources ● Person ● Relationship ● Person Search ● Records ● Record ● Record Search ● ... Hypermedia
What If... ...an API changes domains?
What If... HTTP says... “Moved” ...an API changes domains? HTTP/1.1 301 Moved Permanently 
 Location: http://www.facebook.com/ 

What If... ...an API changes domains?
What If... ...an API changes domains? HTTP/1.1 301 Moved Permanently 
 Location: http://familysearch.io/ 

What If... ...a resource moves? /platform/tree/persons/12345/matches /platform/tree/persons/12345/duplicates
What If... ...a resource moves? <html> <body> 
 <form action=”/path/to/resource”> <input 
/> </form> </body> </html>
What If... ...a resource moves? <html> <body> 
 <form action=”/path/to/resource”> <input 
/> </form> </body> </html> <html> <body> 
 <form action=”/NEW/resource/PATH”> <input 
/> </form> </body> </html>
What If... ...a resource moves? <html> <body> 
 <form action=”/path/to/resource”> <input 
/> </form> </body> </html> <html> <body> 
 <form action=”/NEW/resource/PATH”> <input 
/> </form> </body> </html> Hypermedia
What If... ...a resource moves? <gedcomx> <person id=”12345”> 
 <link rel=”matches” href=”/persons/12345/matches”/> 
 </person> </gedcomx>
What If... ...a resource moves? <gedcomx> <person id=”12345”> 
 <link rel=”matches” href=”/persons/12345/matches”/> 
 </person> </gedcomx> <gedcomx> <person id=”12345”> 
 <link rel=”matches” href=”/persons/12345/duplicates”/> 
 </person> </gedcomx>
What If... ...a resource moves? <gedcomx> <person id=”12345”> 
 <link rel=”matches” href=”/persons/12345/matches”/> 
 </person> </gedcomx> <gedcomx> <person id=”12345”> 
 <link rel=”matches” href=”/persons/12345/duplicates”/> 
 </person> </gedcomx> Hypermedia
What If... ...subresources are included in their “parent” resource? /person/12345 Person /person/12345/notes Person Person Notes Source References /person/12345/sources /person/12345 Person + Notes + Source References
What If... ...subresources are included in their “parent” resource? <html> <head> 
 <link rel=”stylesheet” href=”...”/> <script src=”...”></script> 
 </head> <body> 
 </body> </html>
What If... ...subresources are included in their “parent” resource? <html> <head> 
 <link rel=”stylesheet” href=”...”/> <script src=”...”></script> 
 </head> <body> 
 </body> </html> Embedded Links (Hypermedia)
What If... ...subresources are included in their “parent” resource? <html> <head> 
 <link rel=”stylesheet” href=”...”/> <script src=”...”></script> 
 </head> <body> 
 </body> </html> <html> <head> 
 <style> 
 </style> <script> 
 </script> 
 </head> <body> 
 </body> </html>
What If... ...subresources are included in their “parent” resource? <html> <head> 
 <link rel=”stylesheet” href=”...”/> <script src=”...”></script> 
 </head> <body> 
 </body> </html> <html> <head> 
 <style> 
 </style> <script> 
 </script> 
 </head> <body> 
 </body> </html> HTML says... “OK”
What If... ...subresources are included in their “parent” resource? <gedcomx> <person id=”12345”> 
 <link rel=”source-references” href=”/persons/12345/sources”/> <link rel=”notes” href=”/persons/12345/notes”/> 
 </person> </gedcomx>
What If... ...subresources are included in their “parent” resource? <gedcomx> <person id=”12345”> 
 <link rel=”source-references” href=”/persons/12345/sources”/> <link rel=”notes” href=”/persons/12345/notes”/> 
 </person> </gedcomx> Embedded Links (Hypermedia)
What If... ...subresources are included in their “parent” resource? <gedcomx> <person id=”12345”> 
 <link rel=”source-references” href=”/persons/12345/sources”/> <link rel=”notes” href=”/persons/12345/notes”/> 
 </person> </gedcomx> <gedcomx> <person id=”12345”> 
 <source description=”...”/> <note id=”...”> 
 </note> </person> </gedcomx>
What If... ...subresources are included in their “parent” resource? <gedcomx> <person id=”12345”> 
 <link rel=”source-references” href=”/persons/12345/sources”/> <link rel=”notes” href=”/persons/12345/notes”/> 
 </person> </gedcomx> <gedcomx> <person id=”12345”> 
 <source description=”...”/> <note id=”...”> 
 </note> </person> </gedcomx> GEDCOM X says... “OK”
So.
So. ● Speak HTTP fluently. ●Understand the URI. ●Use links to get stuff done.
So. ● Speak HTTP fluently. ● Understand the URI. ● Use links to get stuff done. Yeah. Like a screen scraper.
links
What do links look like?
What do links look like? Depends on the media type.
<a href=”...”/> <link rel=”” href=””/> links <img src=”...”/> <script src=”...”/>
Why use links ? So APIs can change without breaking clients.
How To...
How To... ● Add a person to a collection. ● Search a collection for persons. ● Do a “full” person read. ● Upload an artifact to a collection. ● Edit the birth date of a person. ● Read the list of photos on a person. ● Delete a person.
How To... Add a person to a collection. ● Read the collection. ● Find the link to the “persons” of the collection. ● POST the new person to that URI.
How To... Add a person to a collection. ● Read the collection. ● Find the link to the “persons” of the collection. ● POST the new person to that URI.
How To... Add a person to a collection. GET /platform/collections/tree <gedcomx xmlns=”http://gedcomx.org/v1”> <collection> <title>FamilySearch Family Tree</title> ... <link rel=”persons” href=”/path/to/persons/resource”/> ... </collection> </gedcomx>
How To... Search a collection for persons. ● Read the collection. ● Find the link to the “person-search” of the collection. ● Fill in the parameters and issue the request.
How To... GET /platform/collections/tree <gedcomx xmlns=”http://gedcomx.org/v1”> <collection> <title>FamilySearch Family Tree</title> ... <link rel=”person-search” template=”/path/to/person/search{?q}”/> ... </collection> </gedcomx> Search a collection for persons.
How To... Do a “full” person read. ● Read the person. ● For each “embedded” link, get the resource and embed it. – Source references – Discussion references – Notes – Relationships
How To... Do a “full” person read. <gedcomx xmlns=”http://gedcomx.org/v1”> <person id=”P2”> <name>...</name> ... <link rel=”source-references” href=”/path/to/refs”/> <link rel=”notes” href=”/path/to/notes”/> <link rel=”child-relationships” href=”/path/to/rels”/> <link rel=”parent-relationships” href=”/path/to/rels”/> <link rel=”spouse-relationships” href=”/path/to/rels”/> ... </person> </gedcomx>
How To... Upload an artifact to a collection. ● Read the collection. ● Find the link to the “artifacts”. ● POST the artifact.
How To... Upload an artifact to a collection. GET /platform/collections/tree <gedcomx xmlns=”http://gedcomx.org/v1”> <collection> <title>FamilySearch Family Tree</title> ... <link rel=”artifacts” href=”/path/to/artifacts/resource”/> ... </collection> </gedcomx>
How To... Edit the birth date of a person. ● Read the person. ● Find the link to the “conclusions” of the person. ● POST the changes.
How To... Edit the birth date of a person. <gedcomx xmlns=”http://gedcomx.org/v1”> <person id=”P2”> <name>...</name> ... <link rel=”conclusions” href=”/path/to/conclusions”/> ... </person> </gedcomx>
How To... Read the list of photos on a person. ● Read the person. ● Find the link to the “artifacts” of the person.
How To... Read the list of photos on a person. <gedcomx xmlns=”http://gedcomx.org/v1”> <person id=”P2”> <name>...</name> ... <link rel=”artifacts” href=”/path/to/artifacts”/> ... </person> </gedcomx>
How To... Delete a person. ● Read the person. ● Find the “self” link. ● Apply the DELETE.
How To... Delete a person. <gedcomx xmlns=”http://gedcomx.org/v1”> <person id=”P2”> <name>...</name> ... <link rel=”person” href=”/path/to/self”/> ... </person> </gedcomx>
Tools 97 © 2013 by Intellectual Reserve, Inc. All rights reserved.
Do I have to? 98 © 2013 by Intellectual Reserve, Inc. All rights reserved.
The Goal 99 © 2013 by Intellectual Reserve, Inc. All rights reserved.
The Goal Learn how to use hypermedia for better Web service APIs. Better? ●More Adaptable ●More Robust ●More Maintainable ● Less Pain 100 © 2013 by Intellectual Reserve, Inc. All rights reserved.

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Hypermedia In Practice - FamilySearch Developers Conference 2014

  • 1. Hypermedia in Practice 1 © 2013 by Intellectual Reserve, Inc. All rights reserved.
  • 2. The Goal 2 © 2013 by Intellectual Reserve, Inc. All rights reserved.
  • 3. The Goal Learn how to use hypermedia for better Web service APIs. 3 © 2013 by Intellectual Reserve, Inc. All rights reserved.
  • 4. The Goal Learn how to use hypermedia for better Web service APIs. Better? ●More Adaptable ●More Robust ●More Maintainable ● Less Pain 4 © 2013 by Intellectual Reserve, Inc. All rights reserved.
  • 5. A Review ● Web service API – A set of digital services and/or resources made accessible over a computer network. ● HTTP – Hypertext Transfer Protocol – Defines how to make requests and interpret responses.
  • 6. A Review ● Resources – The units of data making up the “matter” of the API. – The “subject” of HTTP operations. ● Uniform Resource Identifier – The locator for a resource. – Includes a domain, path, query.
  • 7. A Review ● Resource Representations – How resources are serialized to a stream of bytes. – Often JSON and XML. – a.k.a. “media types” or “data formats” ● See “Architecture of the World Wide Web” – http://www.w3.org/TR/webarch/
  • 9. WWW
  • 12. URI
  • 14. Resource HTTP “GET /path/to/resource”
  • 15. “OK" Resource Representation <resource> 
 </resource> { “resource” : 
 }
  • 18. What If... ...a resource representation changes its property order? { 
 “names” : [ 
 ], “facts” : [ 
 ], “gender” : { 
 }, 
 } { 
 “gender” : { 
 }, “names” : [ 
 ], “facts” : [ 
 ], 
 }
  • 19. What If... ...a resource representation adds some whitespace? {“names”:[ 
 ],“facts”: [ 
 ],“gender”:{ 
 },
} { “names” : [ 
 ], “facts” : [ 
 ], “gender” : { 
 }, 
 } <person><name>...</name ><fact>...</fact><gende r>...</gender></person> <person> <name>...</name> <fact>...</fact> <gender>...</gender> </person>
  • 20. ...an XML representation changes namespace prefixes? <person xmlns=”...”> <name>...</name> <fact>...</fact> <gender>...</gender> </person> <gx:person xmlns:gx=”...”> <gx:name>...</gx:name> <gx:fact>...</gx:fact> <gx:gender>...</gx:gender> </gx:person> What If...
  • 21. What If... ...a caching policy changes?
  • 22. What If... ...new resources become available? Available Resources ● Person ● Relationship ● Person Search ● ... Available Resources ● Person ● Relationship ● Person Search ● Records ● Record ● Record Search ● ...
  • 23. What If... ...an API changes domains? https://familysearch.org/platform https://familysearch.io/platform
  • 24. What If... ...a resource moves? /platform/tree/persons/12345/matches /platform/tree/persons/12345/duplicates
  • 25. What If... ...subresources are included in their “parent” resource? /person/12345 Person /person/12345/notes Person Person Notes Source References /person/12345/sources /person/12345 Person + Notes + Source References
  • 26. What If... ● ...property order changes? ● ...some whitespace is added? ● ...XML changes namespace prefixes? ● ...caching policy changes? ● ...new resources are available? ● ...a resource moves? ● ...subresources are included in their "parent" resource?
  • 27. What If... ● ...property order changes? ● ...some whitespace is added? ● ...XML changes namespace prefixes? ● ...caching policy changes? ● ...new resources are available? ● ...a resource moves? ● ...subresources are included in their "parent" resource?
  • 28.
  • 29. Speaks HTTP fluently. Understands the URI. Uses links to get stuff done.
  • 30. ...a resource representation changes its property order? <html> <head> 
 <script src=”...”></script> 
 </head> <body> 
 </body> </html> What If...
  • 31. ...a resource representation changes its property order? <html> <head> 
 <script src=”...”></script> 
 </head> <body> 
 </body> </html> What If... <html> <head> 
 </head> <body> 
 <script src=”...”></script> 
 </body> </html>
  • 32. ...a resource representation changes its property order? <html> <head> 
 <script src=”...”></script> 
 </head> <body> 
 </body> </html> What If... <html> <head> 
 </head> <body> 
 <script src=”...”></script> 
 </body> </html> HTML says... “OK”
  • 33. What If... ...a resource representation changes its property order? { 
 “names” : [ 
 ], “facts” : [ 
 ], “gender” : { 
 }, 
 } { 
 “gender” : { 
 }, “names” : [ 
 ], “facts” : [ 
 ], 
 }
  • 34. What If... ...a resource representation changes its property order? { 
 “names” : [ 
 ], “facts” : [ 
 ], “gender” : { 
 }, 
 } { 
 “gender” : { 
 }, “names” : [ 
 ], “facts” : [ 
 ], 
 } GEDCOM X says... “OK”
  • 35. What If... ...a resource representation adds some whitespace? <html><head>
</head><body>
 </body></html>
  • 36. What If... ...a resource representation adds some whitespace? <html><head>
</head><body>
 </body></html> <html> <head> 
 </head> <body> 
 </body> </html>
  • 37. What If... ...a resource representation adds some whitespace? <html><head>
</head><body>
 </body></html> <html> <head> 
 </head> <body> 
 </body> </html> HTML says... “OK”
  • 38. What If... ...a resource representation adds some whitespace? {“names”:[ 
 ],“facts”: [ 
 ],“gender”:{ 
 },
} { “names” : [ 
 ], “facts” : [ 
 ], “gender” : { 
 }, 
 } <person><name>...</name ><fact>...</fact><gende r>...</gender></person> <person> <name>...</name> <fact>...</fact> <gender>...</gender> </person>
  • 39. What If... ...a resource representation adds some whitespace? { “names” : [ 
 ], “facts” : [ 
 ], “gender” : { 
 }, 
 } <person><name>...</name ><fact>...</fact><gende r>...</gender></person> <person> <name>...</name> <fact>...</fact> <gender>...</gender> </person> {“names”:[ 
 ],“facts”: [ 
 ],“gender”:{ 
 },
} JSON says... “OK”
  • 40. What If... ...a resource representation adds some whitespace? { “names” : [ 
 ], “facts” : [ 
 ], “gender” : { 
 }, 
 } <person><name>...</name ><fact>...</fact><gende r>...</gender></person> <person> <name>...</name> <fact>...</fact> <gender>...</gender> </person> {“names”:[ 
 ],“facts”: [ 
 ],“gender”:{ 
 },
} XML says... “OK”
  • 41. ...an XML representation changes namespace prefixes? <person xmlns=”...”> <name>...</name> <fact>...</fact> <gender>...</gender> </person> <gx:person xmlns:gx=”...”> <gx:name>...</gx:name> <gx:fact>...</gx:fact> <gx:gender>...</gx:gender> </gx:person> What If...
  • 42. ...an XML representation changes namespace prefixes? <person xmlns=”...”> <name>...</name> <fact>...</fact> <gender>...</gender> </person> <gx:person xmlns:gx=”...”> <gx:name>...</gx:name> <gx:fact>...</gx:fact> <gx:gender>...</gx:gender> </gx:person> What If...XML says... “OK”
  • 43. What If... ...a caching policy changes? HTTP/1.1 200 OK 
 Cache-Control: no-store 

  • 44. What If... ...a caching policy changes? HTTP/1.1 200 OK 
 Cache-Control: no-store 
 HTTP/1.1 200 OK 
 Cache-Control: public, max-age=3600 ETag: 1234567890 

  • 45. What If... HTTP says... “OK” ...a caching policy changes? HTTP/1.1 200 OK 
 Cache-Control: no-store 
 HTTP/1.1 200 OK 
 Cache-Control: public, max-age=3600 ETag: 1234567890 

  • 46. What If... ...a caching policy changes?
  • 47. What If... ...new resources become available?
  • 48. What If... ...new resources become available?
  • 49. What If... ...new resources become available? Available Resources ● Person ● Relationship ● Person Search ● ... Available Resources ● Person ● Relationship ● Person Search ● Records ● Record ● Record Search ● ...
  • 50. What If... ...new resources become available? Available Resources ● Person ● Relationship ● Person Search ● ... Available Resources ● Person ● Relationship ● Person Search ● Records ● Record ● Record Search ● ... Hypermedia
  • 51. What If... ...an API changes domains?
  • 52. What If... HTTP says... “Moved” ...an API changes domains? HTTP/1.1 301 Moved Permanently 
 Location: http://www.facebook.com/ 

  • 53. What If... ...an API changes domains?
  • 54. What If... ...an API changes domains? HTTP/1.1 301 Moved Permanently 
 Location: http://familysearch.io/ 

  • 55. What If... ...a resource moves? /platform/tree/persons/12345/matches /platform/tree/persons/12345/duplicates
  • 56. What If... ...a resource moves? <html> <body> 
 <form action=”/path/to/resource”> <input 
/> </form> </body> </html>
  • 57. What If... ...a resource moves? <html> <body> 
 <form action=”/path/to/resource”> <input 
/> </form> </body> </html> <html> <body> 
 <form action=”/NEW/resource/PATH”> <input 
/> </form> </body> </html>
  • 58. What If... ...a resource moves? <html> <body> 
 <form action=”/path/to/resource”> <input 
/> </form> </body> </html> <html> <body> 
 <form action=”/NEW/resource/PATH”> <input 
/> </form> </body> </html> Hypermedia
  • 59. What If... ...a resource moves? <gedcomx> <person id=”12345”> 
 <link rel=”matches” href=”/persons/12345/matches”/> 
 </person> </gedcomx>
  • 60. What If... ...a resource moves? <gedcomx> <person id=”12345”> 
 <link rel=”matches” href=”/persons/12345/matches”/> 
 </person> </gedcomx> <gedcomx> <person id=”12345”> 
 <link rel=”matches” href=”/persons/12345/duplicates”/> 
 </person> </gedcomx>
  • 61. What If... ...a resource moves? <gedcomx> <person id=”12345”> 
 <link rel=”matches” href=”/persons/12345/matches”/> 
 </person> </gedcomx> <gedcomx> <person id=”12345”> 
 <link rel=”matches” href=”/persons/12345/duplicates”/> 
 </person> </gedcomx> Hypermedia
  • 62. What If... ...subresources are included in their “parent” resource? /person/12345 Person /person/12345/notes Person Person Notes Source References /person/12345/sources /person/12345 Person + Notes + Source References
  • 63. What If... ...subresources are included in their “parent” resource? <html> <head> 
 <link rel=”stylesheet” href=”...”/> <script src=”...”></script> 
 </head> <body> 
 </body> </html>
  • 64. What If... ...subresources are included in their “parent” resource? <html> <head> 
 <link rel=”stylesheet” href=”...”/> <script src=”...”></script> 
 </head> <body> 
 </body> </html> Embedded Links (Hypermedia)
  • 65. What If... ...subresources are included in their “parent” resource? <html> <head> 
 <link rel=”stylesheet” href=”...”/> <script src=”...”></script> 
 </head> <body> 
 </body> </html> <html> <head> 
 <style> 
 </style> <script> 
 </script> 
 </head> <body> 
 </body> </html>
  • 66. What If... ...subresources are included in their “parent” resource? <html> <head> 
 <link rel=”stylesheet” href=”...”/> <script src=”...”></script> 
 </head> <body> 
 </body> </html> <html> <head> 
 <style> 
 </style> <script> 
 </script> 
 </head> <body> 
 </body> </html> HTML says... “OK”
  • 67. What If... ...subresources are included in their “parent” resource? <gedcomx> <person id=”12345”> 
 <link rel=”source-references” href=”/persons/12345/sources”/> <link rel=”notes” href=”/persons/12345/notes”/> 
 </person> </gedcomx>
  • 68. What If... ...subresources are included in their “parent” resource? <gedcomx> <person id=”12345”> 
 <link rel=”source-references” href=”/persons/12345/sources”/> <link rel=”notes” href=”/persons/12345/notes”/> 
 </person> </gedcomx> Embedded Links (Hypermedia)
  • 69. What If... ...subresources are included in their “parent” resource? <gedcomx> <person id=”12345”> 
 <link rel=”source-references” href=”/persons/12345/sources”/> <link rel=”notes” href=”/persons/12345/notes”/> 
 </person> </gedcomx> <gedcomx> <person id=”12345”> 
 <source description=”...”/> <note id=”...”> 
 </note> </person> </gedcomx>
  • 70. What If... ...subresources are included in their “parent” resource? <gedcomx> <person id=”12345”> 
 <link rel=”source-references” href=”/persons/12345/sources”/> <link rel=”notes” href=”/persons/12345/notes”/> 
 </person> </gedcomx> <gedcomx> <person id=”12345”> 
 <source description=”...”/> <note id=”...”> 
 </note> </person> </gedcomx> GEDCOM X says... “OK”
  • 71. So.
  • 72. So. ● Speak HTTP fluently. ●Understand the URI. ●Use links to get stuff done.
  • 73. So. ● Speak HTTP fluently. ● Understand the URI. ● Use links to get stuff done. Yeah. Like a screen scraper.
  • 74. links
  • 75. What do links look like?
  • 76. What do links look like? Depends on the media type.
  • 77. <a href=”...”/> <link rel=”” href=””/> links <img src=”...”/> <script src=”...”/>
  • 78. Why use links ? So APIs can change without breaking clients.
  • 80. How To... ● Add a person to a collection. ● Search a collection for persons. ● Do a “full” person read. ● Upload an artifact to a collection. ● Edit the birth date of a person. ● Read the list of photos on a person. ● Delete a person.
  • 81. How To... Add a person to a collection. ● Read the collection. ● Find the link to the “persons” of the collection. ● POST the new person to that URI.
  • 82. How To... Add a person to a collection. ● Read the collection. ● Find the link to the “persons” of the collection. ● POST the new person to that URI.
  • 83. How To... Add a person to a collection. GET /platform/collections/tree <gedcomx xmlns=”http://gedcomx.org/v1”> <collection> <title>FamilySearch Family Tree</title> ... <link rel=”persons” href=”/path/to/persons/resource”/> ... </collection> </gedcomx>
  • 84. How To... Search a collection for persons. ● Read the collection. ● Find the link to the “person-search” of the collection. ● Fill in the parameters and issue the request.
  • 85. How To... GET /platform/collections/tree <gedcomx xmlns=”http://gedcomx.org/v1”> <collection> <title>FamilySearch Family Tree</title> ... <link rel=”person-search” template=”/path/to/person/search{?q}”/> ... </collection> </gedcomx> Search a collection for persons.
  • 86. How To... Do a “full” person read. ● Read the person. ● For each “embedded” link, get the resource and embed it. – Source references – Discussion references – Notes – Relationships
  • 87. How To... Do a “full” person read. <gedcomx xmlns=”http://gedcomx.org/v1”> <person id=”P2”> <name>...</name> ... <link rel=”source-references” href=”/path/to/refs”/> <link rel=”notes” href=”/path/to/notes”/> <link rel=”child-relationships” href=”/path/to/rels”/> <link rel=”parent-relationships” href=”/path/to/rels”/> <link rel=”spouse-relationships” href=”/path/to/rels”/> ... </person> </gedcomx>
  • 88. How To... Upload an artifact to a collection. ● Read the collection. ● Find the link to the “artifacts”. ● POST the artifact.
  • 89. How To... Upload an artifact to a collection. GET /platform/collections/tree <gedcomx xmlns=”http://gedcomx.org/v1”> <collection> <title>FamilySearch Family Tree</title> ... <link rel=”artifacts” href=”/path/to/artifacts/resource”/> ... </collection> </gedcomx>
  • 90. How To... Edit the birth date of a person. ● Read the person. ● Find the link to the “conclusions” of the person. ● POST the changes.
  • 91. How To... Edit the birth date of a person. <gedcomx xmlns=”http://gedcomx.org/v1”> <person id=”P2”> <name>...</name> ... <link rel=”conclusions” href=”/path/to/conclusions”/> ... </person> </gedcomx>
  • 92. How To... Read the list of photos on a person. ● Read the person. ● Find the link to the “artifacts” of the person.
  • 93. How To... Read the list of photos on a person. <gedcomx xmlns=”http://gedcomx.org/v1”> <person id=”P2”> <name>...</name> ... <link rel=”artifacts” href=”/path/to/artifacts”/> ... </person> </gedcomx>
  • 94. How To... Delete a person. ● Read the person. ● Find the “self” link. ● Apply the DELETE.
  • 95. How To... Delete a person. <gedcomx xmlns=”http://gedcomx.org/v1”> <person id=”P2”> <name>...</name> ... <link rel=”person” href=”/path/to/self”/> ... </person> </gedcomx>
  • 96. Tools 97 © 2013 by Intellectual Reserve, Inc. All rights reserved.
  • 97. Do I have to? 98 © 2013 by Intellectual Reserve, Inc. All rights reserved.
  • 98. The Goal 99 © 2013 by Intellectual Reserve, Inc. All rights reserved.
  • 99. The Goal Learn how to use hypermedia for better Web service APIs. Better? ●More Adaptable ●More Robust ●More Maintainable ● Less Pain 100 © 2013 by Intellectual Reserve, Inc. All rights reserved.