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/ {<br/>    alias /opt/cs5/;<br/>    index index.html;<br/>    try_files $uri $uri/ @routercs5;<br/>}<br/>location @routercs5 {<br/>    rewrite ^/(cs5)/(.+)$ /$1/index.html last;<br/>}

An alternative setup can use a root directory and a generic named location:

location / {<br/>    root /opt/;<br/>    index index.html;<br/>    try_files $uri $uri/ @router;<br/>}<br/>location @router {<br/>    # default to serving the front‑end homepage<br/>}