Version: 2021.3
Retrieving a Texture from an HTTP Server (GET)
Sending a form to an HTTP server (POST)

Downloading an AssetBundle from an HTTP server (GET)

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To download an AssetBundle from a remote server, you can use UnityWebRequest.GetAssetBundle. This function streams data into an internal buffer, which decodes and decompresses the AssetBundle’s data on a worker thread.

The function’s arguments take several forms. In its simplest form, it takes only the URL from which the AssetBundle should be downloaded. You may optionally provide a checksum to verify the integrity of the downloaded data.

Alternately, if you wish to use the AssetBundle caching system, you may provide either a version number or a Hash128 data structure. These are identical to the version numbers or Hash128 objects provided to the old system via WWW.LoadFromCacheOrDownload.


  • This function creates a UnityWebRequest and sets the target URL to the supplied URL argument. It also sets the HTTP verb to GET, but sets no other flags or custom headers.
  • This function attaches a DownloadHandlerAssetBundle to the UnityWebRequest. This download handler has a special assetBundle property, which can be used to extract the AssetBundle once enough data has been downloaded and decoded to permit access to the resources inside the AssetBundle.
  • If you supply a version number or Hash128 object as arguments, it also passes those arguments to the DownloadHandlerAssetBundle. The download handler then employs the caching system.


using UnityEngine;
using UnityEngine.Networking;
using System.Collections;
public class MyBehaviour : MonoBehaviour {
    void Start() {
    IEnumerator GetAssetBundle() {
        UnityWebRequest www = UnityWebRequestAssetBundle.GetAssetBundle("");
        yield return www.SendWebRequest();
        if (www.result != UnityWebRequest.Result.Success) {
        else {
            AssetBundle bundle = DownloadHandlerAssetBundle.GetContent(www);
Retrieving a Texture from an HTTP Server (GET)
Sending a form to an HTTP server (POST)