Mastering macOS Programming

Creating the manager

Now let's implement that HTTP request manager:

1. Create a new Swift file and name it HTTPRequestManager.swift.
2. Under the import statement, create the HTTPRequestManager class by adding the following code:

class HTTPRequestManager {     static let sharedInstance = HTTPRequestManager ()     let session: URLSession     let sessionDelegate: HTTPRequestDelegate     private  init()     {         let configuration =                   URLSessionConfiguration.background(withIdentifier:                  "downloadConfig")         configuration.httpAdditionalHeaders                          = ["Accept": "application/pdf"]         sessionDelegate = HTTPRequestDelegate()         session = URLSession(configuration: configuration,                                  delegate: sessionDelegate,                                  delegateQueue: nil)     } } 

Once again, the compiler is puzzled by the stuff ...