Display 3D from url

I'm doing vuforia + unity app. I have 3D model in server then i'm getting the url and display into 3D. But some of them suggested to go with Assetbundle. But i have different url randomly user upload their url to my server. So, is there any way to display 3D from url without using AssetBundle or how can i use use AssetBundle for different url?

 public string url = "";
 
  mTargetMetadata = targetSearchResult.MetaData;
          
         JSONObject json = JSONObject.Parse(mTargetMetadata);
         
         string type=json.GetString("type");
          url=json.GetString("overlay3d");
         
          Debug.Log("url value is " + url );
         
     // stop the target finder (i.e. stop scanning the cloud)
     mCloudRecoBehaviour.CloudRecoEnabled = false;
         
         mShowGUIButton = true;
     
         StartCoroutine(GetAssetBundle());
           GameObject newImageTarget = Instantiate(ImageTargetTemplate.gameObject) as GameObject;
          
         GameObject augmentation = null;
  
         if( augmentation != null )
             augmentation.transform.parent = newImageTarget.transform;
  
         // enable the new result with the same ImageTargetBehaviour:
       //  ImageTargetBehaviour imageTargetBehaviour = mImageTracker.TargetFinder.EnableTracking(targetSearchResult, newImageTarget);
          
 //StartCoroutine(GetAssetBundle());
  
         Debug.Log("Metadata value is " + url );
         StartCoroutine(GetAssetBundle());
         
         
         
         // Build augmentation based on target
 if (ImageTargetTemplate) {
     // enable the new result with the same ImageTargetBehaviour:
     ImageTracker tracker = TrackerManager.Instance.GetTracker<ImageTracker>();
     ImageTargetBehaviour imageTargetBehaviour = 
         (ImageTargetBehaviour)tracker.TargetFinder.EnableTracking(
             targetSearchResult, ImageTargetTemplate.gameObject);
 }
 
 IEnumerator GetAssetBundle ()
 {
  
 www = new WWW(url);
 yield return www;
 Debug.Log("The last BundleURL " + url );
  
 AssetBundleRequest request = www.assetBundle.LoadAsync("CloudRecognition", typeof(GameObject));
 yield return request;
  
         Instantiate(request.asset, new Vector3(3f, 0f, 0f), Quaternion.identity);
         Instantiate(request.asset, new Vector3(0f, 0f, 0f), Quaternion.identity);
         Instantiate(request.asset, new Vector3(-3f, 0f, 0f), Quaternion.identity);
         www.assetBundle.Unload(true);
         
 //Instantiate(request.asset, new Vector3(0f, 0f, 0f), Quaternion.identity);
  
 //Put the stream model under the image target
 GameObject ImageTargetUsed = GameObject.Find("3DObject");
          GameObject ModelIpadClone = GameObject.Find("CloudRecognition(Clone)");
          ModelIpadClone.transform.parent = ImageTargetUsed.transform;
  
 }