var request = new HttpRequest();
var url = "https://[2001:db8:ac:ac::1234]/api/aaaLogin.json";
var method = "POST";
var body = JSON.stringify({
  "aaaUser" : {
    "attributes" : {
      "name" : "admin",
      "pwd" : "mysuperduperpassword"
    }
  }
});
response = request.customRequest(method.toUpperCase(), url, body);

/**
 * Actual result: 400 Bad Request
 * 
 * from webserver logs i can see that HTTP method was 'Login.json' instead of 'POST'.
 * i.e.  Login.json  /api/aaaLogin.json HTTP/1.1   -> 400 Bad Request
 * 
 * Expected result: 200 OK
 * Good example on webserver logs shows:   POST  /api/aaaLogin.json HTTP/1.1
 */