I am using Alamofire for the networking in my application. In Alamofire, I am writing POST method to pass value to the url, but it is not passing any value. The is showing null. Below is my code:

```
let parameters = ["username": "\(textField.text)"]
let urlString = "**Some URL**"
Alamofire.request(.POST, urlString, parameters: parameters, encoding: .JSON).responseJSON { response in 
    guard response.result.error == nil else {
        print("error calling POST on email API")
        print(response.result.error!)
        return
    }

    if let value = response.result.value {
        print("The email is: \(value)" )
    }
}

```

If anyone get the mistake what I am doing wrong. Thank you!!