nginx.conf

http {
  [...]
  # webp support
  # see: https://docs.ewww.io/article/16-ewww-io-and-webp-images
  map $http_accept $webp_suffix {
      default "";
      "~*webp" ".webp";
  }
  
  server {
    [...]
    location ~* ^.+\.(png|jpe?g)$ {
        ### Please change the domainname before uncommenting the following
        # valid_referers none blocked www.example.com example.com;
        # if ($invalid_referer) { return 403; }

        # add_header Vary Accept;
        # see https://docs.ewww.io/article/16-ewww-io-and-webp-images
        try_files $uri$webp_suffix $uri =404;
        expires max;
        log_not_found off;
        access_log off;
    }
    [...]
  }
  
  [...]
}