Hello guys, I am having good traffic on my site but my bandwidth is wasted due to daily crawling of SEs. So I have got one idea tht if I return a proper 304 header to them it may tht they ll not crawl my page which was not updated. So I need to put 304 code on them.. So is it worth to put 304 code ..From SEO point of view is it better to do tht..? or is there any obstacles behind them.