Handle unknown content-type of response with Alamofire

Question

I use Alamofire to do requests to a rest service. If the request is successful the server returns a JSON with content-type application/json. But if the request fails the server returns a simple String.

So, I don't know how to handle on it with Alamofire, because I don't know how the response look like. I need a solution to handle on the different response types.

This code I can use to handle on a successful request:

request(.POST, wholeUrl, parameters: parameters, encoding: .Custom(encodingClosure))
            //.validate()
        .responseJSON {
            (request, response, data, error) -> Void in

                //check if error is returned
                if (error == nil) {
                    //this crashes if simple string is returned
                    JSONresponse = JSON(object: data!)
                }

And this code I can use to handle on failed request:

    request(.POST, wholeUrl, parameters: parameters, encoding: .Custom(encodingClosure))
            //.validate()
        .responseString {
            (request, response, data, error) -> Void in

                //check if error is returned
                if (error == nil) {
                    responseText = data!
                }

Answer 1

I've solved my problem:

request(.POST, wholeUrl, parameters: parameters, encoding: .Custom(encodingClosure))
    .validate()
.response {
    (request, response, data, error) -> Void in

        //check if error is returned
        if (error == nil) {
            var serializationError: NSError?
            let json: AnyObject? = NSJSONSerialization.JSONObjectWithData(data! as! NSData, options: NSJSONReadingOptions.AllowFragments, error: &serializationError)

            JSONresponse = JSON(object: json!)
        }
        else {
             //this is the failure case, so its a String
        }
 }