class Aws::Plugins::TransferEncoding::Handler

def call(context)
  if streaming?(context.operation.input)
    # If it's an IO object and not a File / String / String IO
    unless context.http_request.body.respond_to?(:size)
      if requires_length?(context.operation.input)
        # if size of the IO is not available but required
        raise Aws::Errors::MissingContentLength.new
      elsif context.operation['authtype'] == "v4-unsigned-body"
        context.http_request.headers['Transfer-Encoding'] = 'chunked'
      end
    end
  end
  @handler.call(context)
end