Copy stream for upload requests and remove expect header #739
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Stream is being closed (disposed) when request is sent by HttpClient. See dotnet/runtime#14612
It was actually resolved in .NET Core (dotnet/corefx#19082), but since we need to support the .NET Framework too, another fix is required.
The drawback of copying stream is that we allocate additional memory for the copied stream (basically stream size is doubled).
Another fix that could be applied instead would be to check if token is valid before making the upload request.