What is natural way to dispose UnityWebRequest instance after ReceiveData return false

Scripting
1

Documentation says about ReceiveData function:
“This function requires a return value of either true or false. If you return false, the system immediately aborts the UnityWebRequest. If you return true, processing continues normally.”

What is natural way to continue process / dispose UnityWebRequest instance after ReceiveData return false?

I experimented and find out if ReceiveData return false process never reach code after yield.

public class LoggingDownloadHandler : DownloadHandlerScript
{
    //...
    int i = 1;
    protected override bool ReceiveData(byte[] data, int dataLength)
    {
        if (data == null || data.Length < 1 || i == 5)
            return false;

        i++;
        return true;
    }
}

public class Downloader : MonoBehaviour
{
    void Start()
    {
        StartCoroutine(LoadFromWeb("my_real_url"));
    }

    IEnumerator LoadFromWeb(string url)
    {
        UnityWebRequest wr = new UnityWebRequest(url);

        LoggingDownloadHandler handler = new LoggingDownloadHandler();
        wr.downloadHandler = handler;

        yield return wr.Send();

        if (!wr.isError)
        {
            //...
        }

        wr.Dispose();
    }
}
2 
using (var wr = new UnityWebRequest(url))
{
    var handler = .....;
    wr.downloadHandler = handler;

    yield return wr.Send();
    if (!wr.isError)
    {
        ....
    }
}
3

I wanted to ask what happens to the request when running from the editor and play mode stops? I had the issue that my webrequest was loading mesh data and sometimes returned after play mode stopped, leaking them into the scene. I handled this without the using directive but with manually disposing the request OnDestroy.
Would this be handled by stopping play mode? I guess not.

4

Returning false will abort UnityWebRequest you should reach the point after yield. Which version/platform are you on?
UnityWebRequest runs in both play mode and edit mode, so it will continue even if you exit play mode.

5

Thanks for clarification