public IEnumerator CallLogin(string Username, string Password) {


    UnityWebRequest www =
  UnityWebRequest.Post("http://localhost:8080/unity/login", new
     User(Username, Password).ToJson());

    www.uploadHandler.contentType = "application/json";

    yield return www.Send();

    if (www.error != null)
    {

        Debug.Log("Error " + www.error);

    }
    else {

        Debug.Log("Response  " + www.downloadHandler.text);

    }

}

@ResponseBody
@RequestMapping(value = "/login", method = RequestMethod.POST,
        produces = MediaType.APPLICATION_JSON_VALUE, consumes = MediaType.APPLICATION_JSON_VALUE)
public ResponseEntity<UserModel> Login(@RequestBody User user){

    // check if the username and password provided matches a user in the database.
    String verifiedResponse = this.defaultUserDAOService.verification(user);

    UserModel userModel = new UserModel();

    if(verifiedResponse.equalsIgnoreCase("Verified")){ // if the user was verified successfully (Found in the database)

        userModel.setUser(defaultUserDAOService.getByUsername(user.getUserName()))
                .setSuccessful(true)
                .setResponseMessage("Successful");


        return new ResponseEntity<>(userModel, HttpStatus.OK); // return response to client.


    }else{

        userModel.setUser(new User())
                .setSuccessful(false)
                .setResponseMessage("Username or Password is incorrect");

        return new ResponseEntity<>(userModel, HttpStatus.NOT_FOUND); // return response to client.

    }


}

public User(string userName, string password)
{
    this.userName = userName;

    this.password = password;
}

public string userName;

public string password;


public string ToJson()
{
    return JsonUtility.ToJson(this);
}