UnityWebRequest Accept-Encoding issues on iOS/OSX

I'm not sure whether this is the right forum section to post about this issue, but has anyone gotten the Accept-Encoding/Content-Encoding headers to work properly with UnityWebRequest on iOS/OSX devices? I'm having this strange issue trying to implement Gzip decompression on our project. Basically two possible scenarios will happen:

Scenario 1:
SetRequestHeader("Accept-Encoding", "gzip") has been set on a web request call to our servers, which in a normal situation should return the data in the compressed format. This works on Windows/Android devices. However, on iOS/OSX devices, it will return "gzip" as the "Content-Encoding" Response header correctly, but never actually gives the compressed data/text, even though a check on the server end shows that it has been returned correctly.

Scenario 2:
The request header is NOT set, but it still somehow returns "gzip" as the "Content-Encoding" Response Header on iOS/OSX devices. As with the above scenario, it works fine with Android/Windows.

In conclusion, it seems like no matter what header is set, it always returns the same header/content on iOS/OSX devices.

The following is a snippet/example of the code for the web request implementation:

Code (CSharp):

1. w.SetRequestHeader("Accept-Encoding", "gzip");
2. yield return w.SendWebRequest();
3. string headerResponse = w.GetResponseHeader("Content-Encoding");
4. string returnedText = w.downloadHandler.text;
5. string returnedData = w.downloadHandler.data;
6.  

In the above code the "headerResponse" is always "gzip" and the returnedText/returnedData are always NOT gzip compressed regardless of what header request was set.

Am I doing something wrong here?

 

@Aurimas-Cernius So from what you're saying if I understand correctly, is that on platforms that support gzip decompression I do not have to set the request header? Or do I have to set the request header still but the decompression is handled automatically by Unity? If I don't have to set the request header, how does the client know whether the server backend supports gzip compression?

Also in regards to Android, I'm not too clear on what you mean by that. Are you saying that certain versions/models don't support gzip? If yes, how do I know whether its supported?

Also note that the documentation on this is not particularly clear either.