Understanding the Nginx try_files Directive

Nginx's configuration syntax is highly flexible, and since version 0.7 it includes the try_files directive, which can be combined with named locations to partially replace the commonly used rewrite configuration, improving request resolution efficiency.

The try_files directive attempts to read a static file; it checks the variables $uri (the request path, e.g., /index.html ) and $uri/ (a directory, e.g., /hello/test/ ). If the first variable points to an existing file, Nginx returns it directly.

If the first variable does not exist, Nginx proceeds to the second variable; if that exists, it is returned. If none of the listed files exist, Nginx redirects the request to the third parameter, which is usually a named location that contains further rewrite rules.

Example configuration: location /cs5/ { alias /opt/cs5/; index index.html; try_files $uri $uri/ @routercs5; } location @routercs5 { rewrite ^/(cs5)/(.+)$ /$1/index.html last; }

An alternative setup can use a root directory and a generic named location: location / { root /opt/; index index.html; try_files $uri $uri/ @router; } location @router { # default to serving the front‑end homepage }