How to prevent continuous website visiting proactively? <p>I found my httpd processes were using a lot of resources in 'htop' (while my page view is actually low and my webserver has 4 CPU with 4G RAM), so I tried to find out what was happening.</p> <p>Then I found there is an IP kept visiting my site via httpd access log.</p> <p>After I blocked this IP, my web server was back to normal.</p> <p>However, I found the problem after my server was in heavy load, which already caused a lot of connection rejections earlier. Therefore my questions are:</p> <p>(1) What kind of visiting is this? From the rate of the visiting, it's definitely not a human. I looked up this IP, it's from Neitherland, no other information.</p> <p>(2) What if they change the IP to visit my site like this again? Any way to prevent this kind of visiting proactively?</p>