Unity Image Downloader example

DownloadHelper.cs

using System;
using System.Collections;
using System.Text;
using UnityEngine;
using UnityEngine.Networking;

public class DownloadHelper : MonoBehaviour
{
    private string userName = string.Empty;
    private string password = string.Empty;

    public delegate void ImageDownloaded(Texture2D image);
    public event ImageDownloaded OnImageDownloaded;

    private string GetBasicAuthHeader()
    {
        var auth = string.Format("{0}:{1}", userName, password);
        auth = Convert.ToBase64String(Encoding.GetEncoding("ISO-8859-1").GetBytes(auth));
        return string.Format("Basic {0}", auth);
    }

    public void DownloadImage(string uri)
    {
        StartCoroutine(RunImageDownload(uri));
    }

    private IEnumerator RunImageDownload(string uri)
    {
        using (var request = UnityWebRequest.Get(uri))
        {
            // If you need authorization for the REST API
            // request.SetRequestHeader("Authorization", GetBasicAuthHeader());

            request.Send();

            while (!request.isDone)
            {
                if (request.downloadProgress > -1)
                {
                    // Display loading progress bar or whatever you need
                }
            }

            // Clear your progress bar

            if (request.isNetworkError || request.isHttpError)
            {
                Debug.LogError("Network Error: " + request.error);
                yield break;
            }

            Debug.Log("Network Response: " + request.responseCode);

            // Load the image data
            var imageData = request.downloadHandler.data;
            var downloadedImage = new Texture2D(0, 0);
            downloadedImage.LoadImage(imageData);

            if (OnImageDownloaded != null)
            {
                OnImageDownloaded.Invoke(downloadedImage);
            }
        }
    }
}