Upload URL from `video.save` negotiates HTTP/1.1; SDK's FileFullRequestBody forces duplex (HTTP/2-only) → OkHttp ProtocolException

[tergel93]

video.save returns an upload_url that negotiates ALPN = HTTP/1.1.
The SDK’s okhttp/FileFullRequestBody unconditionally returns isDuplex=true (meant for HTTP/2).
When uploading to that URL, OkHttp rejects duplex over HTTP/1.1 and throws:
java.net.ProtocolException: Duplex connections are not supported for HTTP/1

[tergel93]

I don't think this is a bug in the VK Android SDK.
The real fix should be on the video uploading (object storage) server side.