REST in peace @ Codemotion 2011
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Presentation at the 2011 Codemotion (formerly known as the italian JavaDay) about RESTful architectures and caching with Edge Side Includes specification.
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REST in peace @ Codemotion 2011
- 1. REST in peace Rome, March 5th 2011 Licensed under CC license
- 2. Agenda Rest in a nutshell ESI in a nutshell The uniform interface Pros/Cons Bad APIs ESI + REST Problems Licensed under CC license Rome, March 5th 2011
- 3. Sorry for the ugly slide. There will be others. Really sorry. Licensed under CC license Rome, March 5th 2011
- 4. Let's go! Licensed under CC license Rome, March 5th 2011
- 5. Let's go back! Licensed under CC license Rome, March 5th 2011
- 6. 2000 Fielding's dissertation: REpresentational State Transfer http://www.ics.uci.edu/~fielding/pubs/dissertation/rest_arch_style.htm Licensed under CC license Rome, March 5th 2011
- 7. REST in a nutshell: Licensed under CC license Rome, March 5th 2011
- 8. REST in a nutshell: 1. Client <> Server Licensed under CC license Rome, March 5th 2011
- 9. REST in a nutshell: 2. Stateless Licensed under CC license Rome, March 5th 2011
- 10. Recover and failover paradise Licensed under CC license Rome, March 5th 2011
- 11. What about the user session? Licensed under CC license Rome, March 5th 2011
- 12. Must die Licensed under CC license Rome, March 5th 2011
- 13. What about the user cookies? Licensed under CC license Rome, March 5th 2011
- 14. Should die Licensed under CC license Rome, March 5th 2011
- 15. Wondering why? Licensed under CC license Rome, March 5th 2011
- 16. Wondering why? Send a cookie via FTP. http://www.google.it/search?sourceid=chrome&client=ubuntu&channel=cs&ie=UTF-8&q=ftp+cookies And http://www.ics.uci.edu/~fielding/pubs/dissertation/evaluation.htm#sec_6_3_4_2 Licensed under CC license Rome, March 5th 2011
- 17. REST in a nutshell: 3. Cacheable Licensed under CC license Rome, March 5th 2011
- 18. REST in a nutshell: When dealing with safe methods, the response should be able to tell the client, or whatever stands behind the request, how to cache it. Licensed under CC license Rome, March 5th 2011
- 19. REST in a nutshell: 4. Layered system Licensed under CC license Rome, March 5th 2011
- 20. REST in a nutshell: 5. Uniform interface Licensed under CC license Rome, March 5th 2011
- 21. Uniform interface hierarchic resource identification HTTP verbs to perform operations manipulation through representation HATEOAS Licensed under CC license Rome, March 5th 2011
- 22. Richardson maturity model hierarchic resource identification HTTP verbs to perform operations manipulation through representation HATEOAS Really well explained by Fowler: http://martinfowler. com/articles/richardsonMaturityModel.html#level0 Licensed under CC license Rome, March 5th 2011
- 23. Richardson maturity model mess hierarchic resource identification HTTP verbs to perform operations HATEOAS Licensed under CC license Rome, March 5th 2011
- 24. Richardson maturity model 0. mess hierarchic resource identification HTTP verbs to perform operations HATEOAS Licensed under CC license Rome, March 5th 2011
- 25. 0 Using HTTP Licensed under CC license Rome, March 5th 2011
- 26. Without giving a f*** Licensed under CC license Rome, March 5th 2011
- 27. Richardson maturity model 1. 0. mess hierarchic resource identification HTTP verbs to perform operations HATEOAS Licensed under CC license Rome, March 5th 2011
- 28. 1 mytastyproduct.com/users mytastyproduct.com/users/1/licenses/4 Licensed under CC license Rome, March 5th 2011
- 29. Richardson maturity model 1. 0. mess hierarchic resource identification 2. HTTP verbs to perform operations HATEOAS Licensed under CC license Rome, March 5th 2011
- 30. 2 Licensed under CC license Rome, March 5th 2011
- 31. Richardson maturity model 1. 0. mess hierarchic resource identification 2. HTTP verbs to perform operations 3. HATEOAS Licensed under CC license Rome, March 5th 2011
- 32. 3. GOD http://www.slideshare.net/trilancer/why-hateoas-1547275 Licensed under CC license Rome, March 5th 2011
- 33. Hyperlinks Licensed under CC license Rome, March 5th 2011
- 34. Hypermedia formats http://amundsen.com/hypermedia/ Licensed under CC license Rome, March 5th 2011
- 35. Single entry point Licensed under CC license Rome, March 5th 2011
- 36. Uniform interface is interesting. Everyone seem to have its own RESTful "service". But no one seem to entirely implement a uniform interface. Licensed under CC license Rome, March 5th 2011
- 37. Uniform interface is interesting. Everyone seem to have its own RESTful "service". But no one seem to entirely implement a uniform interface. That means... ...? Licensed under CC license Rome, March 5th 2011
- 38. No RESTful stuff Licensed under CC license Rome, March 5th 2011
- 39. But don't be too religious. Licensed under CC license Rome, March 5th 2011
- 40. But don't be too religious. Cookies stuff included. REST gets raped everyday, get over it. Licensed under CC license Rome, March 5th 2011
- 41. Counterorder Licensed under CC license Rome, March 5th 2011
- 42. Let's be religious 'bout that! Licensed under CC license Rome, March 5th 2011
- 43. Just for a couple minutes :) Licensed under CC license Rome, March 5th 2011
- 44. API #fail Licensed under CC license Rome, March 5th 2011
- 45. Licensed under CC license Rome, March 5th 2011
- 46. flickr.com/people/{user-id} Licensed under CC license Rome, March 5th 2011
- 47. flickr.com/photos/{user-id} Licensed under CC license Rome, March 5th 2011
- 48. flickr.com/photos/{user-id} flickr.com/users/{user-id}/photos/ Licensed under CC license Rome, March 5th 2011
- 49. flickr.photos.delete Licensed under CC license Rome, March 5th 2011
- 50. wow, a delete! Licensed under CC license Rome, March 5th 2011
- 51. POST Licensed under CC license Rome, March 5th 2011
- 52. Is that even legal? Licensed under CC license Rome, March 5th 2011
- 53. Licensed under CC license Rome, March 5th 2011
- 54. GET /api.twitter.com/1/users/show.format Licensed under CC license Rome, March 5th 2011
- 55. GET /api.twitter.com/1/users/show.format GET /api.twitter.com/1/users/ HTTP Accept header: http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html Licensed under CC license Rome, March 5th 2011
- 56. GET /api.twitter.com/1/users/search.format?query... Licensed under CC license Rome, March 5th 2011
- 57. GET /api.twitter.com/1/users/search.format?query... GET /api.twitter.com/1/users?name=jack Licensed under CC license Rome, March 5th 2011
- 58. Licensed under CC license Rome, March 5th 2011
- 59. Only JSON responses Licensed under CC license Rome, March 5th 2011
- 60. JSON is evil Licensed under CC license Rome, March 5th 2011
- 61. { "date": "2011-01-01", "stock": "100", "price": "12" } Licensed under CC license Rome, March 5th 2011
- 62. The business evolves Licensed under CC license Rome, March 5th 2011
- 63. { "date": "2011-01-01", "stock": "100", "price": [ {"currency": "EUR", "amount": "12"}, {"currency": "USD", "amount": "10"} ] } Credits: http://twitter.com/#!/odracci Licensed under CC license Rome, March 5th 2011
- 64. Yeah, client is broken Licensed under CC license Rome, March 5th 2011
- 65. No good Licensed under CC license Rome, March 5th 2011
- 66. BTW <xml...> <product...> <price currency="EUR">25</price> <price currency="USD">23</price> </product> </xml> Licensed under CC license Rome, March 5th 2011
- 67. Well, getting back to... Licensed under CC license Rome, March 5th 2011
- 68. Licensed under CC license Rome, March 5th 2011
- 69. Create a new class http://<server>:[<port>]/class/<database>/<class-name> Licensed under CC license Rome, March 5th 2011
- 70. Response? Licensed under CC license Rome, March 5th 2011
- 71. HTTP/1.1 201 Created Cache-Control: no-cache, no-store, max-age=0, must-revalidate Pragma: no-cache Date: Fri Feb 18 03:21:09 CET 2011 Content-Type: text/plain Server: OrientDB Server v.0.9.24 Connection: Keep-Alive Set-Cookie: OSESSIONID=OS12979956697985725150466358620636; Path=/; HttpOnly CONTENT-LENGTH: 221 Licensed under CC license Rome, March 5th 2011
- 72. CAN I HAZ HATEOAZ? Licensed under CC license Rome, March 5th 2011
- 73. HTTP 201 Created Location /bla bla bla bla... http://en.wikipedia.org/wiki/HTTP_location Licensed under CC license Rome, March 5th 2011
- 74. I am really ashamed of having bothered you for 78 slides to say how to perform a GET Licensed under CC license Rome, March 5th 2011
- 75. ESI in peace Rome, March 5th 2011 Licensed under CC license Rome, March 5th 2011
- 76. Edge Side Includes A de facto standard for bla bla bla... Licensed under CC license Rome, March 5th 2011
- 77. Edge Side Includes A de facto standard for bla bla bla... Server side includes ( not SSI! ) usually handled by the architecture's ESI processor. http://www.w3.org/TR/esi-lang http://www.w3.org/TR/edge-arch Licensed under CC license Rome, March 5th 2011
- 78. Include <esi:include src="http://codemotion.it/talks/1" /> Licensed under CC license Rome, March 5th 2011
- 79. Try/Catch <esi:try> <esi:attempt> <esi:comment text="The REST talk"/> <esi:include src="http://codemotion.it/talks/1" /> </esi:attempt> Licensed under CC license Rome, March 5th 2011
- 80. Fallback <esi:try> <esi:attempt> <esi:comment text="The REST talk"/> <esi:include src="http://codemotion.it/talks/1" /> </esi:attempt> <esi:except> <esi:comment text="fallback"/> <p>epic fail</p> </esi:except> </esi:try> Licensed under CC license Rome, March 5th 2011
- 81. Pitfalls Licensed under CC license Rome, March 5th 2011
- 82. Pitfalls Processor configuration Licensed under CC license Rome, March 5th 2011
- 83. Pitfalls Processor configuration Implementation of fallbacks for handling errors Licensed under CC license Rome, March 5th 2011
- 84. Pitfalls Processor configuration Implementation of fallbacks for handling errors it relies on the processor, which gains importance, for creating any single response ( not really true :-) ) Licensed under CC license Rome, March 5th 2011
- 85. Pros Licensed under CC license Rome, March 5th 2011
- 86. Pros Licensed under CC license Performances Rome, March 5th 2011
- 87. Pros Effective gateway cache Licensed under CC license Rome, March 5th 2011
- 88. Pros Scalability Licensed under CC license Rome, March 5th 2011
- 89. Which leads us to... Licensed under CC license Rome, March 5th 2011
- 90. REST+ESI in peace Rome, March 5th 2011 Licensed under CC license Rome, March 5th 2011
- 91. This is a response Licensed under CC license Rome, March 5th 2011
- 92. aggregating many resources Licensed under CC license Rome, March 5th 2011
- 93. So here's a resource. Licensed under CC license Rome, March 5th 2011
- 94. So here's a resource. Or, better, its representation. Licensed under CC license Rome, March 5th 2011
- 95. Five minutes cache 2 days cache Licensed under CC license Rome, March 5th 2011
- 96. Let's write our own caching system Licensed under CC license Rome, March 5th 2011
- 97. because we need to cache different resources with different expiring intervals odino@odino-phenom:~$ ab -n 1000 -c 10 http://127. 0.0.1/tmp/esi.php This is ApacheBench, Version 2.3 <$Revision: 655654 $> Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/ Licensed to The Apache Software Foundation, http: //www.apache.org/ Benchmarking 127.0.0.1 (be patient) Completed 100 requests Completed 200 requests Completed 300 requests Completed 400 requests Licensed under CC license Rome, March 5th 2011
- 98. Hell no! Licensed under CC license Rome, March 5th 2011
- 99. USE ESI and HTTP cache Licensed under CC license Rome, March 5th 2011
- 100. Understanding the web cache http://www.mnot.net/cache_docs/#WORK HTTP cache http://www.w3.org/Protocols/rfc2616/rfc2616-sec13.html Licensed under CC license Rome, March 5th 2011
- 101. Without a single LoC Licensed under CC license Rome, March 5th 2011
- 102. ehm... Licensed under CC license Rome, March 5th 2011
- 103. With a few LoCs, gotta admit Licensed under CC license Rome, March 5th 2011
- 104. The Architecture Licensed under CC license Rome, March 5th 2011
- 105. Client Reverse proxy / ESI processor Application Database Licensed under CC license Rome, March 5th 2011
- 106. No problems, uh? Licensed under CC license Rome, March 5th 2011
- 107. Hell Licensed under CC license no! Rome, March 5th 2011
- 108. 1. Complexity Licensed under CC license Rome, March 5th 2011
- 109. 1. Complexity Resolved by your needs Licensed under CC license Rome, March 5th 2011
- 110. 2. Caching Licensed under CC license Rome, March 5th 2011
- 111. 2. Caching Resolved by the gateway cache aka your reverse proxy aka, most of the time, Varnish Licensed under CC license Rome, March 5th 2011
- 112. You know Varnish, don't you? Licensed under CC license Rome, March 5th 2011
- 113. Without varnish Concurrency Level: 10 Time taken for tests: 1.467 seconds Complete requests: 1000 Failed requests: 0 Write errors: 0 Total transferred: 5476471 bytes HTML transferred: 5285280 bytes Requests per second: 681.69 [#/sec] (mean) Time per request: 14.670 [ms] (mean) Time per request: 1.467 [ms] (mean, across all concurrent requests) Transfer rate: 3645.73 [Kbytes/sec] received Licensed under CC license Rome, March 5th 2011
- 114. With varnish Concurrency Level: 10 Time taken for tests: 0.179 seconds Complete requests: 1000 Failed requests: 0 Write errors: 0 Total transferred: 5479938 bytes HTML transferred: 5288556 bytes Requests per second: 5587.65 [#/sec] (mean) Time per request: 1.790 [ms] (mean) Time per request: 0.179 [ms] (mean, across all concurrent requests) Transfer rate: 29902.34 [Kbytes/sec] received Licensed under CC license Rome, March 5th 2011
- 115. AWESOME huh? Licensed under CC license Rome, March 5th 2011
- 116. NO. Licensed under CC license Rome, March 5th 2011
- 117. Where's my HATEOAS, again? Licensed under CC license Rome, March 5th 2011
- 118. Defining a request header in ESI <esi:environment> <esi:request_header name="Accept" value="text/vnd.odino.xhtml"/> </esi:environment> Licensed under CC license Rome, March 5th 2011
- 119. Defining a request header in ESI <esi:environment> <esi:request_header name="Accept" value="text/vnd.odino.xhtml"/> </esi:environment> Content Negotiation Licensed under CC license Rome, March 5th 2011
- 120. Awful support Licensed under CC license Rome, March 5th 2011
- 121. Client Reverse proxy ? Application Licensed under CC license Rome, March 5th 2011
- 122. Client Reverse proxy ESI processor Application Licensed under CC license Rome, March 5th 2011
- 123. Some freaking crazy people built a webserver Licensed under CC license Rome, March 5th 2011
- 124. in PHP Licensed under CC license Rome, March 5th 2011
- 125. with the RAD framework Symfony2 http://symfony-reloaded.org/ https://github.com/pminnieur/ServerBundle Licensed under CC license Rome, March 5th 2011
- 126. That means you should be able to write your own reverse proxy acting as an ESI processor. I mean, if they were able to write a webserver... Licensed under CC license Rome, March 5th 2011
- 127. in PHP Licensed under CC license Rome, March 5th 2011
- 128. you have no excuses Licensed under CC license Rome, March 5th 2011
- 129. But please Licensed under CC license Rome, March 5th 2011
- 130. Make it support all the ESI stuff Licensed under CC license Rome, March 5th 2011
- 131. Not like Varnish http://www.varnish-cache.org/trac/wiki/ESIfeatures Licensed under CC license Rome, March 5th 2011
- 132. Extended content negotiation Licensed under CC license Rome, March 5th 2011
- 133. text/vnd.xhtml+xml;profile=esi Chapter 8: http://www.rfc-editor.org/rfc/rfc3236.txt Licensed under CC license Rome, March 5th 2011
- 134. Response to the proc text/vnd.xhtml+xml;profile=esi <head> .... </head> <body> <esi ... /> </body> Licensed under CC license Rome, March 5th 2011
- 135. Profile is used because the browser won't render such this kind of formats: Licensed under CC license Rome, March 5th 2011
- 136. text/vnd.xhesiml+xml Licensed under CC license Rome, March 5th 2011
- 137. Response for fragments text/vnd.xhesiml+xml <div> .... </div> <span> <esi ... /> </span> Licensed under CC license Rome, March 5th 2011
- 138. Client Reverse proxy Supporting all the ESI ESI processor specification http://www.w3.org/TR/esi-lang Application Licensed under CC license Rome, March 5th 2011
- 139. Overhead? Licensed under CC license Rome, March 5th 2011
- 140. Is that a problem? Licensed under CC license Rome, March 5th 2011
- 141. Client Reverse proxy Supporting all the ESI ESI processor specification http://www.w3.org/TR/esi-lang Application Licensed under CC license Rome, March 5th 2011
- 142. Varnish is there for a reason Licensed under CC license Rome, March 5th 2011
- 143. Because at that Licensed under CC license Rome, March 5th 2011
- 144. Varnish ROCKS! Licensed under CC license Rome, March 5th 2011
- 145. Ready to include a resource with our custom hypermedia format <esi:environment> <esi:request_header name="Accept" value="text/vnd.blablabla"/> </esi:environment> Licensed under CC license Rome, March 5th 2011
- 146. But don't screw everything forgetting the remaining parts of HATEOAS, like hypermedia relations. http://www.slideshare.net/adorepump/hateoas-the-confusing-bit-from-rest http://tech.groups.yahoo.com/group/rest-discuss/message/17011 Licensed under CC license Rome, March 5th 2011
- 147. So, with a Licensed under CC license Rome, March 5th 2011
- 148. Layered Licensed under CC license Rome, March 5th 2011
- 149. Cacheable Licensed under CC license Rome, March 5th 2011
- 150. Stateless Licensed under CC license Rome, March 5th 2011
- 151. Driven by Licensed under CC license Rome, March 5th 2011
- 152. Uniform interface Licensed under CC license Rome, March 5th 2011
- 153. and hypermedia Licensed under CC license Rome, March 5th 2011
- 154. architecture Licensed under CC license Rome, March 5th 2011
- 155. Oh Licensed under CC license dear Rome, March 5th 2011
- 156. Richardson maturity model level 3 Licensed under CC license Rome, March 5th 2011
- 157. Again... Licensed under CC license Rome, March 5th 2011
- 158. Pros Licensed under CC license Performances Rome, March 5th 2011
- 159. Pros Scalability Licensed under CC license Rome, March 5th 2011
- 160. Pros Durability Licensed under CC license Rome, March 5th 2011
- 161. Where to REST in peace Rome, March 5th 2011 Licensed under CC license Rome, March 5th 2011
- 162. any webservice Licensed under CC license Rome, March 5th 2011
- 163. machine to machine Licensed under CC license Rome, March 5th 2011
- 164. Be the next AtomPub http://bitworking.org/projects/atom/rfc5023.html Licensed under CC license Rome, March 5th 2011
- 165. Actually... Licensed under CC license Rome, March 5th 2011
- 166. Licensed under CC license Rome, March 5th 2011
- 167. "REST is software design on the scale of decades: every detail is intended to promote software longevity and independent evolution. Many of the constraints are directly opposed to short-term efficiency. Unfortunately, people are fairly good at short-term design, and usually awful at long-term design. " Roy Fielding Licensed under CC license Rome, March 5th 2011
- 168. Put a bit of REST everywhere Licensed under CC license Rome, March 5th 2011
- 169. http://articles.sfgate.com/2011-02-20/opinion/28613184_1_news-network-cable-and-satellite-website http://tech.groups.yahoo.com/group/rest-discuss/message/17370 +2.500% traffic Licensed under CC license Rome, March 5th 2011
- 170. Rules of good design Licensed under CC license Rome, March 5th 2011
- 171. No need to be religious Licensed under CC license Rome, March 5th 2011
- 172. This talk sucks in peace Rome, March 5th 2011 Licensed under CC license Rome, March 5th 2011
- 173. 1 Licensed under CC license Rome, March 5th 2011
- 174. Agile development vs REST Licensed under CC license Rome, March 5th 2011
- 175. Agile development vs REST mmmmmmmmmmmm................ http://www.odino.org/288/restful-and-agile-love-hate-love Licensed under CC license Rome, March 5th 2011
- 176. 2 Licensed under CC license Rome, March 5th 2011
- 177. Browsers suck Licensed under CC license Rome, March 5th 2011
- 178. HTTP authentication http://www.odino.org/238/mockups-of-web-authentication-the-rest-rescue Licensed under CC license Rome, March 5th 2011
- 179. 3 Licensed under CC license Rome, March 5th 2011
- 180. HTML5 Licensed under CC license Rome, March 5th 2011
- 181. Everybody loves it Licensed under CC license Rome, March 5th 2011
- 182. I HATE HTML5 Licensed under CC license Rome, March 5th 2011
- 183. Original specification: "support for PUT and DELETE verbs" Licensed under CC license Rome, March 5th 2011
- 184. People went insane Licensed under CC license Rome, March 5th 2011
- 185. Current status? Licensed under CC license Rome, March 5th 2011
- 186. Removed Licensed under CC license Rome, March 5th 2011
- 187. There are no use cases Licensed under CC license Rome, March 5th 2011
- 188. They said Licensed under CC license Rome, March 5th 2011
- 189. http://www.w3.org/TR/2010/WD-html5-diff-20101019/#changes-2010-06-24 Licensed under CC license Rome, March 5th 2011
- 190. Then people got mad Licensed under CC license Rome, March 5th 2011
- 191. A disclaimer in peace Rome, March 5th 2011 Licensed under CC license Rome, March 5th 2011
- 192. JSON does not suck. At all. http://www.slideshare.net/Wombert/xml-versus-the-new-kids-on-the-block-phpbnl11-20110129 Licensed under CC license Rome, March 5th 2011
- 193. Varnish does not suck. At all. Licensed under CC license Rome, March 5th 2011
- 194. HTML5 does not suck. At all. http://www.html5rocks.com/ Licensed under CC license Rome, March 5th 2011
- 195. OrientDB rocks Ask Luca Garulli, he might be in this room http://www.orientechnologies.com/ Licensed under CC license Rome, March 5th 2011
- 196. Everything is a tradeoff Licensed under CC license Rome, March 5th 2011
- 197. Hints? Licensed under CC license Rome, March 5th 2011
- 198. David Zuelke knows best Licensed under CC license Rome, March 5th 2011
- 199. Design HTTP interfaces and RESTful webservices http://www.slideshare.net/Wombert/designing-http-interfaces-and-restful-web-services-phpbnl11-20110128 Licensed under CC license Rome, March 5th 2011
- 200. Others know best Licensed under CC license Rome, March 5th 2011
- 201. 300 RESTful boring slides :) http://www.slideshare.net/guilhermecaelum/rest-in-practice REST as the DBMS of the web http://www.slideshare.net/dnene/rest-representational-state-transfer-explained Licensed under CC license Rome, March 5th 2011
- 202. amazon.it Licensed under CC license Rome, March 5th 2011
- 203. Thanks! Alessandro Nadalin odino.org
- 205. @_odino_ #codemotion Licensed under CC license Rome, March 5th 2011
- 206. 12 - 14 May, Verona
- 207. Credits http://www.flickr.com/photos/larachris/16564077/sizes/o/in/photostream/ http://www.flickr.com/photos/ashatenbroeke/4367373081/sizes/z/in/photostream/ http://www.flickr.com/photos/yourdon/3140270189/sizes/l/in/photostream/ http://www.flickr.com/photos/jox1989/4964706072/sizes/l/in/photostream/ http://www.flickr.com/photos/brainfg/168506259/sizes/o/in/photostream/ http://www.flickr.com/photos/norte_it/3897091546/sizes/o/in/photostream/ http://www.zdnet.com/blog/service-oriented/soap-versus-rest-a-matter-of-style/3568 http://www.flickr.com/photos/turtlemom_nancy/2046347762/sizes/l/in/photostream/ http://www.flickr.com/photos/juanpg/3333385784/sizes/z/in/photostream/ http://www.flickr.com/photos/congvo/301678287/sizes/l/in/photostream/ http://www.flickr.com/photos/ihasb33r/2573196546/sizes/z/in/photostream/ http://www.flickr.com/photos/martin_heigan/4544138976/sizes/o/in/photostream/ http://www.flickr.com/photos/cknara/4195099999/sizes/o/in/photostream/ http://www.flickr.com/photos/1080p/3076529265/sizes/l/in/photostream/ http://www.flickr.com/photos/adamrice/280300202/sizes/l/in/photostream/ http://www.flickr.com/photos/tomer_a/541411897/sizes/o/in/photostream/ http://www.flickr.com/photos/subpra/4514008262/sizes/l/in/photostream/ http://www.flickr.com/photos/lippincott/2539720043/sizes/l/in/photostream/ http://www.flickr.com/photos/rawryder/5086090931/sizes/l/in/photostream/ http://www.flickr.com/photos/robboudon/5312731161/sizes/l/in/photostream/ http://www.flickr.com/photos/bc-burnslibrary/4158243488/sizes/o/in/photostream/ http://www.flickr.com/photos/13606325@N08/2416993706/sizes/o/in/photostream/ http://www.flickr.com/photos/neothezion/5135841069/sizes/l/in/photostream/ http://www.flickr.com/photos/planetschwa/2494067809/ http://www.flickr.com/photos/thomasthomas/258931782/