What’s a redirect URI? how does it apply to iOS app for OAuth2.0?

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Read this:

http://www.quora.com/OAuth-2-0/How-does-OAuth-2-0-work

or an even simpler but quick explanation:

http://agileanswer.blogspot.se/2012/08/oauth-20-for-my-ninth-grader.html

The redirect URI is the callback entry point of the app. Think about how OAuth for Facebook works – after end user accepts permissions, “something” has to be called by Facebook to get back to the app, and that “something” is the redirect URI. Furthermore, the redirect URI should be different than the initial entry point of the app.

The other key point to this puzzle is that you could launch your app from a URL given to a webview. To do this, i simply followed the guide on here:

http://iosdevelopertips.com/cocoa/launching-your-own-application-via-a-custom-url-scheme.html

and

http://inchoo.net/mobile-development/iphone-development/launching-application-via-url-scheme/

note: on those last 2 links, “http://” works in opening mobile safari but “tel://” doesn’t work in simulator

in the first app, I call 

[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"secondApp://"]];

In my second app, I register “secondApp” (and NOT “secondApp://”) as the name of URL Scheme, with my company as the URL identifier.

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