NSURLResponse

NSURLResponse is a class in the Foundation framework of Apple's iOS and macOS operating systems. It is an abstract class that represents the metadata associated with the response to a URL load request. This class is typically used in conjunction with NSURLSession and NSURLConnection to handle the response data from a URL request.

NSURLResponse provides information about the response, such as the MIME type of the content, the expected content length, the suggested filename for downloaded content, and the URL of the response. It also includes methods to access the response's status code and headers.

NSURLResponse has two concrete subclasses: NSHTTPURLResponse and NSURLCacheStoragePolicy. NSHTTPURLResponse is used for HTTP and HTTPS responses and provides additional information specific to these protocols, such as the HTTP status code and headers. NSURLCacheStoragePolicy is used to specify how the response should be cached.

NSURLResponse is designed to be used in conjunction with NSURLSession and NSURLConnection to handle the response data from a URL request. When a URL request is made, the response data is returned as an NSURLResponse object, which can then be used to access the metadata associated with the response. This allows developers to handle the response data appropriately, based on the information provided in the NSURLResponse object.