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So far have this custom API class and I'm wanting to create a custom URL delegate for the tasks that I will be performing with this API, this code below gathered from the Apple Docs -> Apple Docs URL loading/fetching Listing #2 to be exact... keep getting 'Argument type 'API' does not conform to expected type 'URLSessionDelegate''    var delegate: URLSessionDelegate?   static var requestObject: URLSession = {     let configuration = URLSessionConfiguration.ephemeral     configuration.allowsCellularAccess = true     configuration.waitsForConnectivity = true     return URLSession(configuration: configuration, delegate: self, delegateQueue: nil)         }() } protocol URLSessionDelegate{   var delegate: URLSessionDelegate? {get}     } Not sure why but seems to be maybe error in codebase, as I have tried many tutorials and solutions and no one provides an explicit working version for a custom delegate (not a shared session) that allows for various configurations for URLSessions.