OpenMetaverse.AssetManager.HttpRequestTexture C# (CSharp) Method

        private void HttpRequestTexture(UUID textureID, ImageType imageType, float priority, int discardLevel,
    uint packetStart, TextureDownloadCallback callback, bool progress)
        {
            if (textureID == UUID.Zero || callback == null)
                return;

            // Do we have this image in the cache?
            if (Client.Assets.Cache.HasAsset(textureID))
            {
                ImageDownload image = new ImageDownload();
                image.ID = textureID;
                image.AssetData = Client.Assets.Cache.GetCachedAssetBytes(textureID);
                image.Size = image.AssetData.Length;
                image.Transferred = image.AssetData.Length;
                image.ImageType = imageType;
                image.AssetType = AssetType.Texture;
                image.Success = true;

                callback(TextureRequestState.Finished, new AssetTexture(image.ID, image.AssetData));
                FireImageProgressEvent(image.ID, image.Transferred, image.Size);
                return;
            }

            CapsBase.DownloadProgressEventHandler progressHandler = null;

            if (progress)
            {
                progressHandler = (HttpWebRequest request, HttpWebResponse response, int bytesReceived, int totalBytesToReceive) =>
                    {
                        FireImageProgressEvent(textureID, bytesReceived, totalBytesToReceive);
                    };
            }

            Uri url = Client.Network.CurrentSim.Caps.CapabilityURI("GetTexture");

            DownloadRequest req = new DownloadRequest(
                new Uri(string.Format("{0}/?texture_id={1}", url.ToString(), textureID.ToString())),
                Client.Settings.CAPS_TIMEOUT,
                "image/x-j2c",
                progressHandler,
                (HttpWebRequest request, HttpWebResponse response, byte[] responseData, Exception error) =>
                {
                    if (error == null && responseData != null) // success
                    {
                        ImageDownload image = new ImageDownload();
                        image.ID = textureID;
                        image.AssetData = responseData;
                        image.Size = image.AssetData.Length;
                        image.Transferred = image.AssetData.Length;
                        image.ImageType = imageType;
                        image.AssetType = AssetType.Texture;
                        image.Success = true;

                        callback(TextureRequestState.Finished, new AssetTexture(image.ID, image.AssetData));
                        FireImageProgressEvent(image.ID, image.Transferred, image.Size);

                        Client.Assets.Cache.SaveAssetToCache(textureID, responseData);
                    }
                    else // download failed
                    {
                        Logger.Log(
                            string.Format("Failed to fetch texture {0} over HTTP, falling back to UDP: {1}",
                                textureID,
                                (error == null) ? "" : error.Message
                            ),
                            Helpers.LogLevel.Warning, Client);

                        Texture.RequestTexture(textureID, imageType, priority, discardLevel, packetStart, callback, progress);
                    }
                }
            );

            HttpDownloads.QueueDownlad(req);

        }