Where's the NSURLConnection protocol?

Question

The documentation of NSURLConnection says that there are delegate methods like

connection:willSendRequest:redirectResponse: 

But the documentation doesn't mention which delegate protocol to implement. Well, I assume there just isn't any protocol for the delegate, so everything is just optional?

Answer 1

It's an informal protocol implemented in NSURLConnection.h as a category on NSObject:

@interface NSObject (NSURLConnectionDelegate)

That means any subclass of NSObject can be a delegate for NSURLConnection. Yes, all delegate methods are optional.