class Protocol::Rack::Input

def read_next
	if @body
		# User's may forget to call #close...
		if chunk = @body.read
			return chunk
		else
			# So if we are at the end of the stream, we close it automatically:
			@body.close
			@body = nil
		end
	elsif @closed
		raise IOError, "Stream is not readable, input has been closed!"
	end
end