The plugin makes WordPress more friendly to nginx.
The plugin solves two problems:
wp_redirect. Thus, all 301 redrects become 302 redirects which may not be good for SEO. The plugin overrides
wp_redirectwhen it detects that nginx is used.
mod_rewriteis not loaded (which is the case for nginx as it does not load any Apache modules) it falls back to PATHINFO permalinks in Permalink Settings page. nginx itself has built-in support for URL rewriting and does not need PATHINFO permalinks. Thus, when the plugin detects that nginx is used, it makes WordPress think that
mod_rewriteis loaded and it is OK to use pretty permalinks.
The plugin does not require any configuration. It just does its work. You won't notice it — install and forget.
WARNING: nginx must be configured properly to support permalinks.