Trying to Access Error Code in Alamofire

Could not get the server error message from Alamofire 3.3.0

I managed to get it to work exactly the way I want is by dropping the status validation and check for the statusCode manually

Alamofire.request(.POST, "\(self.authBaseURL)/signup", parameters: params, headers: headers, encoding: .JSON)
            .validate(contentType: ["application/json"])
            .responseJSON { response in
                if response.response?.statusCode == 200 {
                    print("Success with JSON: \(response.result.value)")

                    success(updatedUser)
                }
                else {
                    let error = response.result.value as! NSDictionary
                    let errorMessage = error.objectForKey("message") as! String
                    print(errorMessage)
                    failure(errorMessage)
                }

        }

Accessing the error in Alamofire causes EXC_BAD_ACCESS

So as to continue my previous comment on cnoon's answer : I replaced NSLog() with println() and voilà! It works! No more EXC_BAD_ACCESS.

However I don't know why it was a bad access. Is NSLog somehow so slow or does it not copy the value so it's nil when it finally logs? I have no idea...

EDIT : As I said in my question, it only crashed when the query contained a space. And error.description, which is added as-is to the string, contains the URL String. A space encoded in a URL is "%20" so NSLog interpreted it as the string formatter %2, so it went looking for the second optional argument in NSLog which of course, did not exist! Haha! So to really beautifully fix it I replaced the line with :

NSLog("Error: %@", error)

Now it's a beautiful log, without any hiccups! That's what I get for copying some default code which combines Swift string interpolation with Objective-C string formatting!

How to access alamofire response

It seems that the output is in Json, so i'll need to map it into an object(or class,whatever you call it). If you think its not worth it, you can convert it into an Dictionary, i think it will work as well

Error when grabbing data from API using Alamofire

That happens because you are not using a secure site(https), but a http.

Add this in your info.plist

 <key>NSAppTransportSecurity</key>
    <dict>
        <key>NSAllowsArbitraryLoads</key>
        <true/>
        <key>NSExceptionDomains</key>
        <dict>
            <key>example.com</key>
            <dict>
                <key>NSExceptionAllowsInsecureHTTPLoads</key>
                <true/>
                <key>NSIncludesSubdomains</key>
                <true/>
            </dict>
        </dict>
    </dict>

Getting an error when calling the Alamofire in a class function

You need to add Do-Catch Statement

catch – If the throwing method fails and raises an error, the execution will fall into this catch block.

class NetworkLayer{
    class func requested(_ request:Router,completion:@escaping(Result<Data,Error>) -> Void){
        ProgressHUD.show() //if response comes that loader run
        AF.request(request).responseJSON{ (response) in
            switch response.result{
            case .success(let data):
                do{
                    let getDishesData = data as? [String:Any]
                    let resp = try JSONSerialization.data(withJSONObject: getDishesData?["data"], options: .prettyPrinted)
                    completion(.success(response))
                }catch{
                    print(error)
                    completion(.failure(error))
                }
            case .failure(let error):
                completion(.failure(error))
            }
        }
    }
}

One more suggestion for you here no need to do JSONSerialization because responseJSON gives you direct response(That Alamofire will do JSONSerialization).

Final code

class NetworkLayer{
    class func requested(_ request:Router,completion:@escaping(Result<Data,Error>) -> Void){
        ProgressHUD.show() //if response comes that loader run
        AF.request(request).responseJSON{ (response) in
            switch response.result{
            case .success(let response):
                do{
                    print(response)
                    completion(.success(response))
                }catch{
                    print(error)
                    completion(.failure(error))
                }
            case .failure(let error):
                completion(.failure(error))
            }
        }
    }
}

Alamofire error is always nil, while request fails

Need to add .validate() because of by default, Alamofire treats any completed request to be successful, regardless of the content of the response.

From Alamofire documentation:

Validation

By default, Alamofire treats any completed request to be successful,
regardless of the content of the response. Calling validate before a
response handler causes an error to be generated if the response had
an unacceptable status code or MIME type.

Manual Validation

Alamofire.request(.GET, "http://httpbin.org/get", parameters: ["foo": "bar"])
         .validate(statusCode: 200..<300)
         .validate(contentType: ["application/json"])
         .response { _, _, _, error in
             println(error)
         } 

Automatic Validation

Automatically validates status code within 200...299 range, and that
the Content-Type header of the response matches the Accept header of
the request, if one is provided.

Alamofire.request(.GET, "http://httpbin.org/get", parameters: ["foo": "bar"])
         .validate()
         .response { _, _, _, error in
             println(error)
         }

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