class Async::HTTP::Body::Statistics

def to_s
	parts = ["sent #{@bytesize} bytes"]
	
	if duration = self.total_duration
		parts << "took #{format_duration(duration)} in total"
	end
	
	if duration = self.first_chunk_duration
		parts << "took #{format_duration(duration)} until first chunk"
	end
	
	return parts.join('; ')
end