     @class URLProtectionSpace
     @discussion This class represents a protection space requiring authentication.
 */
-open class URLProtectionSpace : NSObject, NSSecureCoding, NSCopying {
+open class URLProtectionSpace : NSObject, NSCopying {
 
     private let _host: String
     private let _isProxy: Bool

        return copy(with: nil)
    }
    
    open func copy(with zone: NSZone? = nil) -> Any { NSUnimplemented() }
    public static var supportsSecureCoding: Bool { return true }

    open func encode(with aCoder: NSCoder) {
        NSUnimplemented()
    }
    public required init?(coder aDecoder: NSCoder) {
        NSUnimplemented()
    }
    
    
    /*!
        @method initWithHost:port:protocol:realm:authenticationMethod:

        @abstract Determine if the password for this protection space can be sent securely
        @result YES if a secure authentication method or protocol will be used, NO otherwise
    */
    open var receivesCredentialSecurely: Bool {
        switch self.protocol {
        // The documentation is ambiguous whether a protection space needs to use the NSURLProtectionSpace… constants, or URL schemes.
        // Allow both.
        case NSURLProtectionSpaceHTTPS: fallthrough
        case "https": fallthrough
        case "ftps":
            return true
            
        default:
            switch authenticationMethod {
            case NSURLAuthenticationMethodDefault: fallthrough
            case NSURLAuthenticationMethodHTTPBasic: fallthrough
            case NSURLAuthenticationMethodHTTPDigest: fallthrough
            case NSURLAuthenticationMethodHTMLForm:
                return false
                
            case NSURLAuthenticationMethodNTLM: fallthrough
            case NSURLAuthenticationMethodNegotiate: fallthrough
            case NSURLAuthenticationMethodClientCertificate: fallthrough
            case NSURLAuthenticationMethodServerTrust:
                return true
                
            default:
                return false
            }
        }
    }
    
    /*!
        @method host
