UnityWebRequest progress always 0 on Oculus Go

Hi,

I am downloading large files in my Oculus Go app using the UnityWebRequest and DownloadHandlerFile classes. When testing via editor, the download progress is correct (values between 0-1). However, on Oculus Go, this value is always 0.

What seems to be the issue?

Thanks!

 

The downloadedBytes property updates nicely on both playforms, the Unity Editor and Oculus Go. However, the UnityWebRequest.GetResponseHeaders() dictionary is null in both the editor and the Oculus Go. If I try to get the Content-Length header manually via uwr.GetResponseHeader("Content-Length"), I get a Null.

So it is kind of weird that inside the Unity Editor the download progress updates, even though the headers dictionary is null. I have checked the uri I use in chrome and Insomnia and they both do return headers, along with the Content-Length entry (which is also correct).

I'll add the code sample just in case:

Spoiler: Code

Code (CSharp):

1. DownloadHandlerFile downloadHandler = new DownloadHandlerFile(path);
2. downloadHandler.removeFileOnAbort = true;
3.  
4. UnityWebRequest uwr = new UnityWebRequest(uri);
5. uwr.method = UnityWebRequest.kHttpVerbGET;
6. uwr.downloadHandler = downloadHandler;
7.  
8. uwr.SendWebRequest();
9.  
10. Debug.Log("RESPONSE CONTENT LENGTH HEADER: " + uwr.GetResponseHeader("Content-Length")); // this returns null
11.  
12. if (uwr != null && uwr.GetResponseHeaders() != null)
13. {
14.     foreach (KeyValuePair<string, string> header in uwr.GetResponseHeaders())
15.     {
16.         Debug.Log(header.Key + ":" + header.Value);
17.     }
18. }
19.  
20. while (!uwr.isDone)
21. {
22.     float downloadProgress = (float)uwr.downloadedBytes / (float)videoSize;
23.     float progress = (float)((int)(downloadProgress * 1000) / 10.0f);
24.     yield return null;
25. }
26.  
27. if (uwr.isNetworkError || uwr.isHttpError)
28. {
29.     Debug.LogError(uwr.error);
30. }
31. else
32. {
33.     Debug.Log("Downloaded file to " + path.Replace("/", "\\"));
34. }

 

You were correct about having to wait. I waited till 0.1% was complete and then the header dictionary is available. However, there is still a problem. For some reason the headers do not contain the "Content-Length" entry when playing with Oculus Go. It is available when playing through Unity Editor. All other headers are present plus the Android has some additional headers.

Spoiler: Headers

Accept-Ranges:bytes
Content-Length:159606348 (Not present in OCULUS GO)
Content-Security-Policy:block-all-mixed-content
Content-Type:video/mp4
Date:Wed, 05 Jun 2019 08:33:54 GMT
Etag: (I hid it)
Last-Modified:Sat, 15 Dec 2018 15:45:31 GMT
Server: (I hid it)
Transfer-Encoding:chunked (Not present in UNITY EDITOR)
Vary:Accept-Encoding,Origin
X-Amz-Meta-User.xdg.origin.url: (I hid it)
X-Amz-Meta-User.xdg.referrer.url: (I hid it)
X-Amz-Request-Id: (I hid it)
X-Android-Received-Millis:1559723584923 (Not present in UNITY EDITOR)
X-Android-Response-Source:NETWORK 200 (Not present in UNITY EDITOR)
X-Android-Selected-Protocol:http/1.1 (Not present in UNITY EDITOR)
X-Android-Sent-Millis:1559723584733 (Not present in UNITY EDITOR)
X-Minio-Deployment-Id: (I hid it)
X-Xss-Protection:1; mode=block

Since "Transfer-Encoding:chunked" is available only on android perhaps this is the problem. I am getting chunked data and the content-length header is available from somewhere else.

 

Why is it chunked when downloading to Oculus Go but not chunked when downloading via Unity Editor?

 

Any ideas how to check the automatically set request headers?

 

The headers that reach the server look like the following (server log):

Spoiler: Request headers

[REQUEST objectAPIHandlers.GetObjectHandler-fm] [xxx.xxx] [2019-06-09 14:41:12 +0000]
GET /movies/xxx.mp4
Host: xxx
X-Forwarded-Port: 443
X-Forwarded-Proto: https
X-Forwarded-Server: xxx
X-Unity-Version: 2019.1.4f1
User-Agent: Dalvik/2.1.0 (Linux; U; Android 7.1.2; Pacific Build/N2G48H)
Accept-Encoding: gzip
X-Forwarded-For: xxx
X-Forwarded-Host: xxx
X-Real-Ip: xxx

And headers that are added to the response (server log):

Spoiler: Response headers

[RESPONSE] [xxx.xxx] [2019-06-09 14:41:26 +0000]
200 OK
Vary: Origin
Content-Security-Policy: block-all-mixed-content
X-Minio-Deployment-Id: xxx
Server: MinIO/RELEASE.2019-06-04T01-15-58Z
Content-Length: 1862201179
Content-Type: video/mp4
X-Xss-Protection: 1; mode=block
X-Amz-Request-Id: xxx
Accept-Ranges: bytes
Last-Modified: Sat, 15 Dec 2018 17:08:38 GMT
ETag: "xxx"

Any ideas what might be the issue here?

As a side note, it would really help if it was possible to iterate over all the headers of the request. Even those created automatically by Unity.

 

Yes, it is with the same request. It seems that if the response reaches Oculus Go, it is split up for some reason. Because the headers logged from the Unity app in Oculus Go have the additional "Transfer-Enconding, chunked" header set.