Initializing a SessionManager in Alamofire 4.0

Question

Just upgraded to Alamofire 4.0. Having issues with the session manager. Firstly actually initialising it:

Previously:

let alamoManager = Alamofire.SessionManager(configuration: configuration)

Now:

let alamoManager = Alamofire.SessionManager(configuration: configuration, delegate: SessionDelegate, serverTrustPolicyManager: ServerTrustPolicyManager?)

What is the session delegate object for and why does it have to be included now? What is the trust policy?

Answer 1

let configuration = URLSessionConfiguration.default
var alamofireManager = Alamofire.SessionManager(configuration: configuration)