let firstCertificate: NSData = try! NSData(contentsOf: URL(fileURLWithPath: Bundle.main.path(forResource: "certificate", ofType: "der")!))
let serverTrustPolicy = ServerTrustPolicy.pinCertificates(certificates:
[SecCertificateCreateWithData(nil, firstCertificate)!],
validateCertificateChain: true,
validateHost: true)
let serverTrustPolicies = ["url": serverTrustPolicy]
return Alamofire.SessionManager(configuration: configuration,
serverTrustPolicyManager: ServerTrustPolicyManager(policies : serverTrustPolicies))