Version: 2021.3
  • C#
Method group is Obsolete


Suggest a change


Thank you for helping us improve the quality of Unity Documentation. Although we cannot accept all submissions, we do read each suggested change from our users and will make updates where applicable.


Submission failed

For some reason your suggested change could not be submitted. Please <a>try again</a> in a few minutes. And thank you for taking the time to help us improve the quality of Unity Documentation.



Obsolete Use UnityWebRequest, a fully featured replacement which is more efficient and has additional features. public string error;


Returns an error message if there was an error during the download (Read Only).

If there was no error, error will return null or an empty string (this is because some platforms don't allow nulls for string values). We recommend that you use String.IsNullOrEmpty to check for the presence of an error so that both cases are covered.

If the object has not finished downloading the data, it will block until the download has finished. Use isDone or yield to see if the data is available.

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour { // Make a request with an invalid url public string url = "invalid_url"; IEnumerator Start() { using (WWW www = new WWW(url)) { yield return www; if (!string.IsNullOrEmpty(www.error)) Debug.Log(www.error); } } }

In the example the URL is not valid so the error message will be "Couldn't resolve host".