Created Issue: ReadAsMultipartAsync gives "Unexpected end of MIME multipart stream... " with async void web API method [579]

When I have a web API method with a signature like this:

public async void Post()

I get an exception that says:
"Unexpected end of MIME multipart stream. MIME multipart message is not complete."

when reading the multipart data with this line:
await Request.Content.ReadAsMultipartAsync(provider);

However when I change the method into:
public async Task<Boolean> Post()

returning a Task with any type (in this case bool) everything works fine.