can you add a feature ?

[Bian-Sh]

could you pls add a feature for auto overwrite cached image by check response-header :If-Modified-Since .
chat with me if you dont understand wht i say.

reference : https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/If-Modified-Since

[IvanMurzak]

It makes sense, need to investigate how better to make it. Current problem which I see that is DownloadHandlerTexture is not able to handle that, there is literally no API by Unity. Looks like to implement this feature need to download a raw image in another way and then create Texture2D from the bytes array.

[IvanMurzak]

Another problem that could be resolved separately is the delay in loading already cached images. But that is a solution to add an optional argument at the loading function, that will allow a user to choose the loading option (with/without verification)

[Bian-Sh]

UnityWebRequest has a Head Function which can set head request , the add header "Last-Modified" to get modified date.
for example

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

public class LastModified : MonoBehaviour
{
    public string url = "https://example.com"; 

    IEnumerator Start()
    {
        using (UnityWebRequest request = UnityWebRequest.Head(url))
        {
            yield return request.SendWebRequest();

            if (request.result == UnityWebRequest.Result.Success)
            {
                string lastModified = request.GetResponseHeader("Last-Modified");
                Debug.Log("Last-Modified: " + lastModified);
            }
            else
            {
                Debug.LogError(request.error);
            }
        }
    }
}

I have no idea if this could make scene, i ask newbing ,but its worth to have a try.

[IvanMurzak]

I don't see how to make it right.
@Bian-Sh You can implement it and create a pull request in this repository.

[Bian-Sh]

I don't see how to make it right. @Bian-Sh You can implement it and create a pull request in this repository.

等什么时候我有时间了会去看的，这个功能应该需要服务器API 也支持，我会去做更多的了解，确认这个 if modified 是否可以通过 Head 方法直接请求。

I will take a look when I have time. This feature should require server API support. I will try to understand more and confirm if the "if modified" can be requested directly through the Head method.

[IvanMurzak]

If anyone needs the feature. Please feel free to contribute to it.