Sending the Request
A URL request encapsulates information about the communication from the application to the server. Most importantly, it specifies the URL of the server for the request, but it also has a timeout interval, a cache policy, and other metadata about the request. A request is represented by the NSURLRequest class. Check out the For the More Curious section at the end of this chapter for more information.
The NSURLSession API is a collection of classes that use a request to communicate with a server in a number of ways. The NSURLSessionTask class is responsible for communicating with a server. The NSURLSession class is responsible for creating tasks that match a given configuration.
A new class, PhotoStore, will be ...
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