{I posted this to cocoa-dev last month but there wasn’t any definitive answer.
Asking here since CFNetwork is what’s producing CF/NSErrors with the
NSURLErrorFailingURLErrorKey.}
So, NSError.h declares NSURLErrorKey, as a userInfo key for the URL associated
with the error.
And NSURLError.h declares NSURLErrorFailingURLErrorKey, which appears to have
the same purpose.
Neither of these is deprecated, although there’s yet another constant
(NSErrorFailingURLStringKey) that is.
What’s the difference between these? If I’m creating an NSError for some kind
of network-related error, using my own custom error domain, and adding a URL to
it to indicate the source of the error, which one is preferred?
(Before you answer “It’s your app, you can put whatever you want in your own
errors” — I work on a framework, not an app, so the NSErrors I produce will be
consumed by other people's apps, and I want them to conform to best practices
so as not to confuse/annoy developers.)
—Jens
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