Evolution of handling API response with Alamofire

alamofire-evolution-before.swift

func signup() {
    let headers: HTTPHeaders? = ["Content-Type": "application/x-www-form-urlencoded",
                                 "Access-Token": "Bearer abcdefgasmyaccesstoken"]
    AF.request("http://myserver.com/",
               method: .post,
               parameters: nil,
               encoding: URLEncoding.default,
               headers: headers,
               interceptor: nil)
        .response(completionHandler: { dataResponse in
            if dataResponse.response?.statusCode == 201 {
                // Handle 201 success
            } else if dataResponse.response?.statusCode == 409 {
                // Handle 409 error
            } else {
                // Handle Unknown error
            }
        })
}