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In this NSURLProtocol tutorial you will learn how to work with the URL loading system and URL schemes to add custom behavior to your apps.

In this NSURLProtocol tutorial, you’ll learn how to define a protocol handler that modifies URL schemes. It will add a rough and ready transparent caching layer, by storing retrieved resources in Core Data. By enabling it, an ordinary UIWebView can then take on the role of a browser by caching downloaded pages for offline viewing at a later time.

Read full tutorial on raywenderlich.com