Robots.txt disallow all with nginx

If you’re managing an environment similar to a production and want to keep bots from indexing traffic, it’s customary to add a robots.txt file at the root of your website to disallow all. Instead of creating a two-line plain text file, you can do this with only nginx:

location = /robots.txt {
  add_header  Content-Type  text/plain;
  return 200 "User-agent: *\nDisallow: /\n";

Add this into your configuration management as determined by environment, or add it by hand, and no longer worry if Google might start broadcasting your dev site to the world.