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Breaking The Cross Domain Barrier

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Alex Sexton
Alex Sexton

If you had to rank the best and worst moments of your JavaScript life, you’d probably rank reading “The Good Parts” up towards the top, and deep down at the bottom of the list would be the day that you found out that you couldn’t make cross-domain requests in the browser. This talk covers the hacks, tips, and tricks to leave the Same Origin Policy in the dust. So grab a cookie, pad your JSON, and learn how to communicate properly.

Technology
1 of 47
Breaking The Cross Domain Barrier ,[object Object]
A Story... ,[object Object],[object Object],[object Object]
Same Origin Policy ,[object Object],[object Object]
Same Origin Policy It’s actually an important rule. You wouldn’t want to have this happen:
Same Origin Policy It’s actually an important rule. You wouldn’t want to have this happen:
YEA BUT WHAT IF... ,[object Object],[object Object],[object Object]
The Solution ,[object Object]
THE END. ,[object Object]
<RecordScratch.wav> ,[object Object],[object Object],[object Object]
Some Options ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Post Message ,[object Object],[object Object]
Post Message ,[object Object]
Post Message ,[object Object],[object Object],[object Object],[object Object],What’s it good for?
Post Message Works In... ,[object Object],[object Object],[object Object],[object Object],[object Object]
JSONP ,[object Object]
JSONEN JavaScript Object Notation Except Not **Formerly JSONP
JSON ,[object Object],[object Object],[object Object]
JSONP ,[object Object]
JSONP - Why it’s special ,[object Object],[object Object]
How JSONP Works ,[object Object]
How JSONP Works ,[object Object],hint-hint
How JSONP Works ,[object Object]
JSONP Is Good For... ,[object Object],[object Object],[object Object],[object Object]
CORS | Tap the Rockies ,[object Object]
CORS - HOW?
CORS - HOW? ,[object Object]
CORS - From the Server... ,[object Object],[object Object]
CORS - Compatibility ,[object Object],[object Object],[object Object],[object Object],Unrelated Graph
CORS - What’s it Good For? ,[object Object],[object Object],[object Object],[object Object],[object Object]
Document.domain Hackz ,[object Object],[object Object],[object Object],[object Object]
Window.name HI! I’m Jerry the Window!
Window.name ,[object Object],[object Object],**This is obviously a little simplified Added to Dojo 2 years ago: http://bugs.dojotoolkit.org/ticket/6893
Server Side Proxies ,[object Object],mySite yourSite myServer http://benalman.com/projects/php-simple-proxy/ Works everywhere XHR does
Crazy iFrame Hacks ,[object Object],[object Object],[object Object],FACTS
Crazy iFrame Hacks ,[object Object],a.com b.com a.com
Crazy iFrame Hacks ,[object Object],a.com b.com a.com Change the url hash on the innermost iframe to the message /#secret
Crazy iFrame Hacks ,[object Object],a.com b.com a.com Have the top level frame read the message on the hash /#secret
Crazy iFrame Hacks ,[object Object],[object Object],[object Object],How to know when to receive data Fast (where it works)
Crazy iFrame Hacks ,[object Object],[object Object]
Best of both worlds? ,[object Object],A library that will use postMessage first and then a series of different techniques based on which browser you use, but with normalized syntax. http://easyxdm.net/
Best of Both Worlds? ,[object Object],http://flxhr.flensed.com/
What about cookies? ,[object Object],[object Object]
What about cookies in Safari? ,[object Object],[object Object]
What about cookies in Safari? If we post to an iframe it will thank us by sending cookies http://anantgarg.com/2010/02/18/cross-domain-cookies-in-safari/
Why Cookies? ,[object Object],TotallyNotTrackingYou.com Other Sites Holds your unique cookie
Lessons ,[object Object],[object Object],[object Object]
Thanks! ,[object Object],[object Object],[object Object],[object Object],[object Object]

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Breaking The Cross Domain Barrier

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  • 2.
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  • 4. Same Origin Policy It’s actually an important rule. You wouldn’t want to have this happen:
  • 5. Same Origin Policy It’s actually an important rule. You wouldn’t want to have this happen:
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  • 7.
  • 8.
  • 9.
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  • 16. JSONEN JavaScript Object Notation Except Not **Formerly JSONP
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  • 31. Window.name HI! I’m Jerry the Window!
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  • 40.
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  • 43.
  • 44. What about cookies in Safari? If we post to an iframe it will thank us by sending cookies http://anantgarg.com/2010/02/18/cross-domain-cookies-in-safari/
  • 45.
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  • 47.