Post Request

@IBAction func loginButtonTouchUpInside(_ sender: UIButton) {
        let username = usernameTextField.text
        let userPassword = passwordTextField.text
        let root = "http://startup-rocket-kperezm.c9users.io/api/v1/"
        let uri = "auth/sign_in"
        let url = "\(root)\(uri)"

        if(username!.isEmpty || userPassword!.isEmpty)
        {
            displayAlertMessage(userMessage: "All fields are required")
            return
        }
        let requestParams = ["email": username,
                      "password": userPassword]

        Alamofire.request(url, method: .post, parameters: requestParams, encoding: JSONEncoding.default, headers: [:])
            .responseJSON { response in
                debugPrint(response)
                self.dismiss(animated: true, completion: nil)
        }
}