srcache_store_statuses
The `srcache_store_statuses` directive specifies which HTTP status codes should be cached in a transparent subrequest-based caching layout.
Description
The srcache_store_statuses directive allows NGINX to define specific HTTP status codes that should trigger caching when a request is processed by the server. When a response is returned with one of the defined statuses, NGINX will decide to store that response in the cache, enabling subsequent requests for the same resource to be served from cache rather than being fetched anew. This directive can take one or more status codes, allowing for flexible and customized caching behaviors depending on application needs.
For example, an application might want to cache responses with 200 (OK) and 404 (Not Found) statuses, but not cache redirects (like 301 or 302) which are typically transient. By configuring these codes wisely, you can optimize performance and resource usage while ensuring that users receive the correct information. The status codes need to be defined in a space-separated format if multiple statuses are specified within a location block, so it's crucial to ensure correct parsing and syntax to avoid configuration errors.
Config Example
location /api {
srcache_store_statuses 200 404;
# other directives
}Ensure the status codes are valid HTTP status codes, as invalid codes could result in unexpected caching behavior.
Be mindful of caching sensitive information; certain status codes might indicate errors that should not be cached.
It's essential to understand the flow of your application’s responses to avoid confusion about what is being cached.