read_body_stream

# File actionpack/lib/action_dispatch/http/request.rb, line 508
      def read_body_stream
        if body_stream
          reset_stream(body_stream) do
            if has_header?(TRANSFER_ENCODING)
              body_stream.read # Read body stream until EOF if "Transfer-Encoding" is present
            else
              body_stream.read(content_length)
            end
          end
        end
      end