The Test Author: kbeezie I’ll show you a very simple demonstration of Nginx’s Limit Request module and how it may be helpful to you in keeping your website up if you are hit by excessive connections or HTTP based denial-of-service attacks. For this test I’m using a copy of my site’s about page saved as about.html, and the Blitz.io service (which is free at the moment) to test the limit_req directive. First I test the page with the following command in Blitz, which will essentially ramp the number of concurrent connections from 1 to 1,075 over a period of 1 minute. The timeout has been set to 2 minutes, and the region set to California. I also set it to consider any response code other than 200 to be an error, otherwise even a 503 response will be considered a hit.