What does `expires -1` mean in NGINX `location` directive?
According to nginx manual, this directive adds the Expires
and Cache-Control
HTTP header to the response.
Value -1
means these headers are set as:
Expires:
current time minus 1 second
Cache-Control: no-cache
So in summary it instructs the browser not to cache the document.
If expires -1
is used, it means that these pages are never cached. The expire
directive instructs the browser to expire file cache after a certain amount of time (or at a certain time). If a negative value is given, there is no caching.